If you’re looking for an auto body shop in New Jersey make sure you give Peotters Tire & Auto a call as the New Jersey areas premier tire and brake shop. Today’s vehicles are made with many different types of fuel-saving materials like lightweight alloys and plastics. It is important for an auto body shop in New Jersey to be aware of the different materials and techniques used for repairing them.
Auto body shops like Peotter’s Tire and Auto and collision repair services refer to manuals for instructions repairing bumpers. The different material types require various finish materials, removal and installation procedures.
When a plastic bumper is cracked or has a small hole it can be repaired to look as good as new. Replacing the bumper is wasteful and it creates unnecessary debris for our landfills.
A good, eco-friendly auto body shop in New Jersey will only recommend replacing the bumper if the damage is severe enough that repair time would be considered unreasonable and quality of results would be unsatisfactory.
(Redirected from Mechanical Engineering) Mechanical Engineering, is the discipline that applies engineering, physics, and materials science principles to design, analyze, manufacture, and maintain mechanical systems. It is the branch of engineering that involves the design, production, and operation of machinery. It is one of the oldest and broadest of the engineering disciplines. The mechanical engineering field requires an understanding of core areas including mechanics, kinematics, thermodynamics, materials science, structural analysis, and electricity. In addition to these core principles, mechanical engineers use tools such as computer-aided design (CAD), and product life cycle management to design and analyze manufacturing plants, industrial equipment and machinery, heating and cooling systems, transport systems, aircraft, watercraft, robotics, medical devices, weapons, and others. Mechanical engineering emerged as a field during the Industrial Revolution in Europe in the 18th century; however, its development can be traced back several thousand years around the world. In the 19th century, developments in physics led to the development of mechanical engineering science. The field has continually evolved to incorporate advancements; today mechanical engineers are pursuing developments in such areas as composites, mechatronics, and nanotechnology. It also overlaps with aerospace engineering, metallurgical engineering, civil engineering, electrical engineering, manufacturing engineering, chemical engineering, industrial engineering, and other engineering disciplines to varying amounts. Mechanical engineers may also work in the field of biomedical engineering, specifically with biomechanics, transport phenomena, biomechatronics, bionanotechnology, and modeling of biological systems. W16 engine of the Bugatti Veyron. Mechanical engineers design engines, power plants, other machines... ...structures, and vehicles of all sizes. The application of mechanical engineering can be seen in the archives of various ancient and medieval societies. In ancient Greece, the works of Archimedes (287–212 BC) influenced mechanics in the Western tradition and Heron of Alexandria (c. 10–70 AD) created the first steam engine (Aeolipile). In China, Zhang Heng (78–139 AD) improved a water clock and invented a seismometer, and Ma Jun (200–265 AD) invented a chariot with differential gears. The medieval Chinese horologist and engineer Su Song (1020–1101 AD) incorporated an escapement mechanism into his astronomical clock tower two centuries before escapement devices were found in medieval European clocks. He also invented the world's first known endless power-transmitting chain drive. During the Islamic Golden Age (7th to 15th century), Muslim inventors made remarkable contributions in the field of mechanical technology. Al-Jazari, who was one of them, wrote his famous Book of Knowledge of Ingenious Mechanical Devices in 1206, and presented many mechanical designs. He is also considered to be the inventor of such mechanical devices which now form the very basic of mechanisms, such as the crankshaft and camshaft. During the 17th century, important breakthroughs in the foundations of mechanical engineering occurred in England. Sir Isaac Newton formulated Newton's Laws of Motion and developed Calculus, the mathematical basis of physics. Newton was reluctant to publish his works for years, but he was finally persuaded to do so by his colleagues, such as Sir Edmond Halley, much to the benefit of all mankind. Gottfried Wilhelm Leibniz is also credited with creating Calculus during this time period. During the early 19th century industrial revolution, machine tools were developed in England, Germany, and Scotland. This allowed mechanical engineering to develop as a separate field within engineering. They brought with them manufacturing machines and the engines to power them. The first British professional society of mechanical engineers was formed in 1847 Institution of Mechanical Engineers, thirty years after the civil engineers formed the first such professional society Institution of Civil Engineers. On the European continent, Johann von Zimmermann (1820–1901) founded the first factory for grinding machines in Chemnitz, Germany in 1848. In the United States, the American Society of Mechanical Engineers (ASME) was formed in 1880, becoming the third such professional engineering society, after the American Society of Civil Engineers (1852) and the American Institute of Mining Engineers (1871). The first schools in the United States to offer an engineering education were the United States Military Academy in 1817, an institution now known as Norwich University in 1819, and Rensselaer Polytechnic Institute in 1825. Education in mechanical engineering has historically been based on a strong foundation in mathematics and science. Archimedes' screw was operated by hand and could efficiently raise water, as the animated red ball demonstrates. Degrees in mechanical engineering are offered at various universities worldwide. In Ireland, Brazil, Philippines, Pakistan, China, Greece, Turkey, North America, South Asia, Nepal, India, Dominican Republic, Iran and the United Kingdom, mechanical engineering programs typically take four to five years of study and result in a Bachelor of Engineering (B.Eng. or B.E.), Bachelor of Science (B.Sc. or B.S.), Bachelor of Science Engineering (B.Sc.Eng.), Bachelor of Technology (B.Tech.), Bachelor of Mechanical Engineering (B.M.E.), or Bachelor of Applied Science (B.A.Sc.) degree, in or with emphasis in mechanical engineering. In Spain, Portugal and most of South America, where neither B.Sc. nor B.Tech. programs have been adopted, the formal name for the degree is "Mechanical Engineer", and the course work is based on five or six years of training. In Italy the course work is based on five years of education, and training, but in order to qualify as an Engineer one has to pass a state exam at the end of the course. In Greece, the coursework is based on a five-year curriculum and the requirement of a 'Diploma' Thesis, which upon completion a 'Diploma' is awarded rather than a B.Sc. In Australia, mechanical engineering degrees are awarded as Bachelor of Engineering (Mechanical) or similar nomenclature although there are an increasing number of specialisations. The degree takes four years of full-time study to achieve. To ensure quality in engineering degrees, Engineers Australia accredits engineering degrees awarded by Australian universities in accordance with the global Washington Accord. Before the degree can be awarded, the student must complete at least 3 months of on the job work experience in an engineering firm. Similar systems are also present in South Africa and are overseen by the Engineering Council of South Africa (ECSA). In the United States, most undergraduate mechanical engineering programs are accredited by the Accreditation Board for Engineering and Technology (ABET) to ensure similar course requirements and standards among universities. The ABET web site lists 302 accredited mechanical engineering programs as of 11 March 2014. Mechanical engineering programs in Canada are accredited by the Canadian Engineering Accreditation Board (CEAB), and most other countries offering engineering degrees have similar accreditation societies. In India, to become an engineer, one needs to have an engineering degree like a B.Tech or B.E or have a diploma in engineering or by completing a course in an engineering trade like fitter from the Industrial Training Institute (ITIs) to receive a "ITI Trade Certificate" and also have to pass the All India Trade Test (AITT) with an engineering trade conducted by the National Council of Vocational Training (NCVT) by which one is awarded a "National Trade Certificate". Similar systems are used in Nepal. Some mechanical engineers go on to pursue a postgraduate degree such as a Master of Engineering, Master of Technology, Master of Science, Master of Engineering Management (M.Eng.Mgt. or M.E.M.), a Doctor of Philosophy in engineering (Eng.D. or Ph.D.) or an engineer's degree. The master's and engineer's degrees may or may not include research. The Doctor of Philosophy includes a significant research component and is often viewed as the entry point to academia. The Engineer's degree exists at a few institutions at an intermediate level between the master's degree and the doctorate. Standards set by each country's accreditation society are intended to provide uniformity in fundamental subject material, promote competence among graduating engineers, and to maintain confidence in the engineering profession as a whole. Engineering programs in the U.S., for example, are required by ABET to show that their students can "work professionally in both thermal and mechanical systems areas." The specific courses required to graduate, however, may differ from program to program. Universities and Institutes of technology will often combine multiple subjects into a single class or split a subject into multiple classes, depending on the faculty available and the university's major area(s) of research. The fundamental subjects of mechanical engineering usually include: Mechanical engineers are also expected to understand and be able to apply basic concepts from chemistry, physics, chemical engineering, civil engineering, and electrical engineering. All mechanical engineering programs include multiple semesters of mathematical classes including calculus, and advanced mathematical concepts including differential equations, partial differential equations, linear algebra, abstract algebra, and differential geometry, among others. In addition to the core mechanical engineering curriculum, many mechanical engineering programs offer more specialized programs and classes, such as control systems, robotics, transport and logistics, cryogenics, fuel technology, automotive engineering, biomechanics, vibration, optics and others, if a separate department does not exist for these subjects. Most mechanical engineering programs also require varying amounts of research or community projects to gain practical problem-solving experience. In the United States it is common for mechanical engineering students to complete one or more internships while studying, though this is not typically mandated by the university. Cooperative education is another option. Future work skills research puts demand on study components that feed student's creativity and innovation. Engineers may seek license by a state, provincial, or national government. The purpose of this process is to ensure that engineers possess the necessary technical knowledge, real-world experience, and knowledge of the local legal system to practice engineering at a professional level. Once certified, the engineer is given the title of Professional Engineer (in the United States, Canada, Japan, South Korea, Bangladesh and South Africa), Chartered Engineer (in the United Kingdom, Ireland, India and Zimbabwe), Chartered Professional Engineer (in Australia and New Zealand) or European Engineer (much of the European Union), or Professional Engineer in Philippines and Pakistan. In the U.S., to become a licensed Professional Engineer (PE), an engineer must pass the comprehensive FE (Fundamentals of Engineering) exam, work a minimum of 4 years as an Engineering Intern (EI) or Engineer-in-Training (EIT), and pass the "Principles and Practice" or PE (Practicing Engineer or Professional Engineer) exams. The requirements and steps of this process are set forth by the National Council of Examiners for Engineering and Surveying (NCEES), a composed of engineering and land surveying licensing boards representing all U.S. states and territories. In the UK, current graduates require a BEng plus an appropriate master's degree or an integrated MEng degree, a minimum of 4 years post graduate on the job competency development, and a peer reviewed project report in the candidates specialty area in order to become a Chartered Mechanical Engineer (CEng, MIMechE) through the Institution of Mechanical Engineers. CEng MIMechE can also be obtained via an examination route administered by the City and Guilds of London Institute. In most developed countries, certain engineering tasks, such as the design of bridges, electric power plants, and chemical plants, must be approved by a professional engineer or a chartered engineer. "Only a licensed engineer, for instance, may prepare, sign, seal and submit engineering plans and drawings to a public authority for approval, or to seal engineering work for public and private clients." This requirement can be written into state and provincial legislation, such as in the Canadian provinces, for example the Ontario or Quebec's Engineer Act. In other countries, such as Australia, and the UK, no such legislation exists; however, practically all certifying bodies maintain a code of ethics independent of legislation, that they expect all members to abide by or risk expulsion. Further information: FE Exam, Professional Engineer, Incorporated Engineer, and Washington Accord Mechanical engineers research, design, develop, build, and test mechanical and thermal devices, including tools, engines, and machines. Mechanical engineers typically do the following: Mechanical engineers design and oversee the manufacturing of many products ranging from medical devices to new batteries. They also design power-producing machines such as electric generators, internal combustion engines, and steam and gas turbines as well as power-using machines, such as refrigeration and air-conditioning systems. Like other engineers, mechanical engineers use computers to help create and analyze designs, run simulations and test how a machine is likely to work. The total number of engineers employed in the U.S. in 2015 was roughly 1.6 million. Of these, 278,340 were mechanical engineers (17.28%), the largest discipline by size. In 2012, the median annual income of mechanical engineers in the U.S. workforce was $80,580. The median income was highest when working for the government ($92,030), and lowest in education ($57,090). In 2014, the total number of mechanical engineering jobs was projected to grow 5% over the next decade. As of 2009, the average starting salary was $58,800 with a bachelor's degree. An oblique view of a four-cylinder inline crankshaft with pistons Many mechanical engineering companies, especially those in industrialized nations, have begun to incorporate computer-aided engineering (CAE) programs into their existing design and analysis processes, including 2D and 3D solid modeling computer-aided design (CAD). This method has many benefits, including easier and more exhaustive visualization of products, the ability to create virtual assemblies of parts, and the ease of use in designing mating interfaces and tolerances. Other CAE programs commonly used by mechanical engineers include product lifecycle management (PLM) tools and analysis tools used to perform complex simulations. Analysis tools may be used to predict product response to expected loads, including fatigue life and manufacturability. These tools include finite element analysis (FEA), computational fluid dynamics (CFD), and computer-aided manufacturing (CAM). Using CAE programs, a mechanical design team can quickly and cheaply iterate the design process to develop a product that better meets cost, performance, and other constraints. No physical prototype need be created until the design nears completion, allowing hundreds or thousands of designs to be evaluated, instead of a relative few. In addition, CAE analysis programs can model complicated physical phenomena which cannot be solved by hand, such as viscoelasticity, complex contact between mating parts, or non-Newtonian flows. As mechanical engineering begins to merge with other disciplines, as seen in mechatronics, multidisciplinary design optimization (MDO) is being used with other CAE programs to automate and improve the iterative design process. MDO tools wrap around existing CAE processes, allowing product evaluation to continue even after the analyst goes home for the day. They also utilize sophisticated optimization algorithms to more intelligently explore possible designs, often finding better, innovative solutions to difficult multidisciplinary design problems. The field of mechanical engineering can be thought of as a collection of many mechanical engineering science disciplines. Several of these subdisciplines which are typically taught at the undergraduate level are listed below, with a brief explanation and the most common application of each. Some of these subdisciplines are unique to mechanical engineering, while others are a combination of mechanical engineering and one or more other disciplines. Most work that a mechanical engineer does uses skills and techniques from several of these subdisciplines, as well as specialized subdisciplines. Specialized subdisciplines, as used in this article, are more likely to be the subject of graduate studies or on-the-job training than undergraduate research. Several specialized subdisciplines are discussed in this section. Mohr's circle, a common tool to study stresses in a mechanical element Main article: Mechanics Mechanics is, in the most general sense, the study of forces and their effect upon matter. Typically, engineering mechanics is used to analyze and predict the acceleration and deformation (both elastic and plastic) of objects under known forces (also called loads) or stresses. Subdisciplines of mechanics include Mechanical engineers typically use mechanics in the design or analysis phases of engineering. If the engineering project were the design of a vehicle, statics might be employed to design the frame of the vehicle, in order to evaluate where the stresses will be most intense. Dynamics might be used when designing the car's engine, to evaluate the forces in the pistons and cams as the engine cycles. Mechanics of materials might be used to choose appropriate materials for the frame and engine. Fluid mechanics might be used to design a ventilation system for the vehicle (see HVAC), or to design the intake system for the engine. Training FMS with learning robot SCORBOT-ER 4u, workbench CNC Mill and CNC Lathe Main articles: Mechatronics and Robotics Mechatronics is a combination of mechanics and electronics. It is an interdisciplinary branch of mechanical engineering, electrical engineering and software engineering that is concerned with integrating electrical and mechanical engineering to create hybrid systems. In this way, machines can be automated through the use of electric motors, servo-mechanisms, and other electrical systems in conjunction with special software. A common example of a mechatronics system is a CD-ROM drive. Mechanical systems open and close the drive, spin the CD and move the laser, while an optical system reads the data on the CD and converts it to bits. Integrated software controls the process and communicates the contents of the CD to the computer. Robotics is the application of mechatronics to create robots, which are often used in industry to perform tasks that are dangerous, unpleasant, or repetitive. These robots may be of any shape and size, but all are preprogrammed and interact physically with the world. To create a robot, an engineer typically employs kinematics (to determine the robot's range of motion) and mechanics (to determine the stresses within the robot). Robots are used extensively in industrial engineering. They allow businesses to save money on labor, perform tasks that are either too dangerous or too precise for humans to perform them economically, and to ensure better quality. Many companies employ assembly lines of robots, especially in Automotive Industries and some factories are so robotized that they can run by themselves. Outside the factory, robots have been employed in bomb disposal, space exploration, and many other fields. Robots are also sold for various residential applications, from recreation to domestic applications. Main articles: Structural analysis and Failure analysis Structural analysis is the branch of mechanical engineering (and also civil engineering) devoted to examining why and how objects fail and to fix the objects and their performance. Structural failures occur in two general modes: static failure, and fatigue failure. Static structural failure occurs when, upon being loaded (having a force applied) the object being analyzed either breaks or is deformed plastically, depending on the criterion for failure. Fatigue failure occurs when an object fails after a number of repeated loading and unloading cycles. Fatigue failure occurs because of imperfections in the object: a microscopic crack on the surface of the object, for instance, will grow slightly with each cycle (propagation) until the crack is large enough to cause ultimate failure. Failure is not simply defined as when a part breaks, however; it is defined as when a part does not operate as intended. Some systems, such as the perforated top sections of some plastic bags, are designed to break. If these systems do not break, failure analysis might be employed to determine the cause. Structural analysis is often used by mechanical engineers after a failure has occurred, or when designing to prevent failure. Engineers often use online documents and books such as those published by ASM to aid them in determining the type of failure and possible causes. Structural analysis may be used in the office when designing parts, in the field to analyze failed parts, or in laboratories where parts might undergo controlled failure tests. Main article: Thermodynamics Thermodynamics is an applied science used in several branches of engineering, including mechanical and chemical engineering. At its simplest, thermodynamics is the study of energy, its use and transformation through a system. Typically, engineering thermodynamics is concerned with changing energy from one form to another. As an example, automotive engines convert chemical energy (enthalpy) from the fuel into heat, and then into mechanical work that eventually turns the wheels. Thermodynamics principles are used by mechanical engineers in the fields of heat transfer, thermofluids, and energy conversion. Mechanical engineers use thermo-science to design engines and power plants, heating, ventilation, and air-conditioning (HVAC) systems, heat exchangers, heat sinks, radiators, refrigeration, insulation, and others. A CAD model of a mechanical double seal Main articles: Technical drawing and CNC Drafting or technical drawing is the means by which mechanical engineers design products and create instructions for manufacturing parts. A technical drawing can be a computer model or hand-drawn schematic showing all the dimensions necessary to manufacture a part, as well as assembly notes, a list of required materials, and other pertinent information. A U.S. mechanical engineer or skilled worker who creates technical drawings may be referred to as a drafter or draftsman. Drafting has historically been a two-dimensional process, but computer-aided design (CAD) programs now allow the designer to create in three dimensions. Instructions for manufacturing a part must be fed to the necessary machinery, either manually, through programmed instructions, or through the use of a computer-aided manufacturing (CAM) or combined CAD/CAM program. Optionally, an engineer may also manually manufacture a part using the technical drawings, but this is becoming an increasing rarity, with the advent of computer numerically controlled (CNC) manufacturing. Engineers primarily manually manufacture parts in the areas of applied spray coatings, finishes, and other processes that cannot economically or practically be done by a machine. Drafting is used in nearly every subdiscipline of mechanical engineering, and by many other branches of engineering and architecture. Three-dimensional models created using CAD software are also commonly used in finite element analysis (FEA) and computational fluid dynamics (CFD). Mechanical engineers are constantly pushing the boundaries of what is physically possible in order to produce safer, cheaper, and more efficient machines and mechanical systems. Some technologies at the cutting edge of mechanical engineering are listed below (see also exploratory engineering). Micron-scale mechanical components such as springs, gears, fluidic and heat transfer devices are fabricated from a variety of substrate materials such as silicon, glass and polymers like SU8. Examples of MEMS components are the accelerometers that are used as car airbag sensors, modern cell phones, gyroscopes for precise positioning and microfluidic devices used in biomedical applications. Main article: Friction stir welding Friction stir welding, a new type of welding, was discovered in 1991 by The Welding Institute (TWI). The innovative steady state (non-fusion) welding technique joins materials previously un-weldable, including several aluminum alloys. It plays an important role in the future construction of airplanes, potentially replacing rivets. Current uses of this technology to date include welding the seams of the aluminum main Space Shuttle external tank, Orion Crew Vehicle test article, Boeing Delta II and Delta IV Expendable Launch Vehicles and the SpaceX Falcon 1 rocket, armor plating for amphibious assault ships, and welding the wings and fuselage panels of the new Eclipse 500 aircraft from Eclipse Aviation among an increasingly growing pool of uses. Composite cloth consisting of woven carbon fiber Main article: Composite material Composites or composite materials are a combination of materials which provide different physical characteristics than either material separately. Composite material research within mechanical engineering typically focuses on designing (and, subsequently, finding applications for) stronger or more rigid materials while attempting to reduce weight, susceptibility to corrosion, and other undesirable factors. Carbon fiber reinforced composites, for instance, have been used in such diverse applications as spacecraft and fishing rods. Main article: Mechatronics Mechatronics is the synergistic combination of mechanical engineering, electronic engineering, and software engineering. The purpose of this interdisciplinary engineering field is the study of automation from an engineering perspective and serves the purposes of controlling advanced hybrid systems. Main article: Nanotechnology At the smallest scales, mechanical engineering becomes nanotechnology—one speculative goal of which is to create a molecular assembler to build molecules and materials via mechanosynthesis. For now that goal remains within exploratory engineering. Areas of current mechanical engineering research in nanotechnology include nanofilters, nanofilms, and nanostructures, among others. See also: Picotechnology Main article: Finite element analysis This field is not new, as the basis of Finite Element Analysis (FEA) or Finite Element Method (FEM) dates back to 1941. But the evolution of computers has made FEA/FEM a viable option for analysis of structural problems. Many commercial codes such as ANSYS, NASTRAN, and ABAQUS are widely used in industry for research and the design of components. Some 3D modeling and CAD software packages have added FEA modules. In the recent times, cloud simulation platforms like SimScale are becoming more common. Other techniques such as finite difference method (FDM) and finite-volume method (FVM) are employed to solve problems relating heat and mass transfer, fluid flows, fluid surface interaction, etc. In recent years meshfree methods like the smoothed particle hydrodynamics are gaining popularity in case of solving problems involving complex geometries, free surfaces, moving boundaries, and adaptive refinement. Main article: Biomechanics Biomechanics is the application of mechanical principles to biological systems, such as humans, animals, plants, organs, and cells. Biomechanics also aids in creating prosthetic limbs and artificial organs for humans. Biomechanics is closely related to engineering, because it often uses traditional engineering sciences to analyse biological systems. Some simple applications of Newtonian mechanics and/or materials sciences can supply correct approximations to the mechanics of many biological systems. Over the past decade the Finite element method (FEM) has also entered the Biomedical sector highlighting further engineering aspects of Biomechanics. FEM has since then established itself as an alternative to in vivo surgical assessment and gained the wide acceptance of academia. The main advantage of Computational Biomechanics lies in its ability to determine the endo-anatomical response of an anatomy, without being subject to ethical restrictions. This has led FE modelling to the point of becoming ubiquitous in several fields of Biomechanics while several projects have even adopted an open source philosophy (e.g. BioSpine). Main article: Computational fluid dynamics Computational fluid dynamics, usually abbreviated as CFD, is a branch of fluid mechanics that uses numerical methods and algorithms to solve and analyze problems that involve fluid flows. Computers are used to perform the calculations required to simulate the interaction of liquids and gases with surfaces defined by boundary conditions. With high-speed supercomputers, better solutions can be achieved. Ongoing research yields software that improves the accuracy and speed of complex simulation scenarios such as transonic or turbulent flows. Initial validation of such software is performed using a wind tunnel with the final validation coming in full-scale testing, e.g. flight tests. Main article: Acoustical engineering Acoustical engineering is one of many other sub disciplines of mechanical engineering and is the application of acoustics. Acoustical engineering is the study of Sound and Vibration. These engineers work effectively to reduce noise pollution in mechanical devices and in buildings by soundproofing or removing sources of unwanted noise. The study of acoustics can range from designing a more efficient hearing aid, microphone, headphone, or recording studio to enhancing the sound quality of an orchestra hall. Acoustical engineering also deals with the vibration of different mechanical systems. Manufacturing engineering, Aerospace engineering and Automotive engineering are sometimes grouped with mechanical engineering. A bachelor's degree in these areas will typically have a difference of a few specialized classes. Lists Associations Wikibooks
The cost of repairing small abrasions, cracks and holes in plastic bumpers is often much cheaper than replacing the part.
Of course, many collision repair technicians would rather replace the part and charge a fee for their labor plus mark-up on the price of the part because they lack in cosmetic repair skills and it is easier to warranty the work.
Working with Plastics
The first step to repairing plastic bumpers is to identify the material in order to choose the method of repair. Auto body shops use ISO codes on the parts to identify the various families of plastics. They cross-reference the codes with charts from the suppliers or by accessing reference materials on the internet.
It is important that the collision repair technician determine the type of plastic they are working with so they know the proper welding procedure to use to avoid damage to the part.
Some plastics can be welded with an airless welder or hot-air welder; others require a hot glue type of procedure. Tests must be performed and welding procedures have to be done correctly to avoid adhesion failure. Some bumpers will melt with a slight color change and they will remain tacky in the area where they have melted.
The bumper repair technician must identify the type of plastic they are working with in order to be successful with adhesive repairs. Failure to properly identify the plastic results in adhesion-related problems.
Some repair materials are based on flexible and rigid plastics. Using the wrong material can cause cracking when the part is flexed or it may not provide the correct strength for the repair area.
Cleaning and Prep
Proper cleaning and prep is critical for proper adhesion and finish. Whether the technician is repairing or replacing the bumper, the part will need to be cleaned. The bumper being repaired is likely to be dirty from the road; the new replacement part can have contamination on it from the manufacturing process.
Auto body repair professionals should use a low-VOC surface cleaner or a special plastics parts cleaner to help prevent solvents from going too deep into the plastic. If solvents are too harsh, they go deep into the plastic and cause adhesion problems after repairs are done.
This is an overview of the process of working with plastics. Time is money in the auto body industry; therefore, many collision repair technicians choose to replace rather than repair plastic bumpers and other parts.
Technology allows us to repair many items that are often replaced. As resources become scarce and landfills become over-full, we really should consider repairing rather than replacing when possible.
Who Really IS the Best Auto Body Shop in New Jersey ?
- Hey this is Donnie Smith.
This lesson, we're gonnatalk about dent repair.
Now before we just jumpon this car and start repairing this dent, it'simportant for any repair job to wash it good withsoap and water to remove all the contaminants,the waxes and greases.
We've already done that,we used a power washer to clean the car and now we're using a wax and grease remover.
And this is just toassure that all the waxes and greases, silicones,things like Armor Alls that may have been sprayedaround the vehicle are removed, 'cause this will eliminatemany of the paint problems that arise during a repair process.
This will also save onsandpaper cause it won't be loading the sandpaperwith these contaminants.
Now we have the repair areaclean and we can begin repairs.
But before we do, we wanna take a look at the damage and seewhat's wrong with it, see where the indirectdamage is and direct damage, and determine what repairmethods we're gonna use to repair this damage.
Now when thinking aboutdamage, it's a good idea to think about water.
Because you know if somethinghits water it goes down, and when it goes down italso pushes a wave up.
So you've got the low areaand you've got the high area.
Think of damage the sameway, because any time there's a dent there's gonna be a low and there's gonna be a high.
So whenever you look at thisdamage, you can see that the center part of the dent isof course the direct damage, but then if you look up here on the top, you can see the crown, oreyebrow some people call it.
And you can see that that is pushed up.
That whole top of the fenderis actually pushed up.
So if you tried justto pull out on the low, or push down on the highthat's not gonna work.
You've got to roll themetal, you've gotta push down on that high while you'repushing out on the low.
Now, when you go todetermining what repair method you're gonna use, you mayhave some different types of tools, you may havesome high dollar tools, a stud welder gun, otherdent repair systems.
Where really what you wanna think of is what is the easiest method? If it's a hammer and dolly,you have access to both sides, then use a hammer and dolly.
Just because you've got thehighest piece of equipment does not mean you haveto use it every time.
Now on this particularrepair, if you drop the liner, you are able to get to the back side.
So if you can get to the back side, this would definitely be acandidate for hammer and dolly.
Feeling back there to see ifthere's room to get a dolly, which I determined that there is.
Another thing to remember isthat whenever you're repairing a dent to reverse what happened.
You wanna work from the outside in.
First in, last out.
So whatever happened first in an accident, that's the last thing you wanna repair.
Also remember whenworking with thin metal, it's thin, and you may be able to move some of this with yourhand some of the times.
Doesn't work every time, butI'm gonna reach back there and keeping that in mind that I'm gonna push down on that high,out on the low area, use my hands to rough this out.
Now this ain't gonna be perfect, it's just to rough out the damage, to get the majority of the damage out.
I can see that there arestill some highs and lows, I can feel 'em.
I know it's hard to see on the video, and even if you're doingthis yourself it may be hard to see this sometimes, butI've got a trick that'll help you locate the lows.
If you get a block withsome 80 grit on it, you can cross sand the damaged area, and what this'll do is that the highs will immediately go to metal, of course, 'cause they're high,but the lows, you'll see it doesn't sand it at all, andthis will identify the lows.
Now you can see the twolow areas very easy.
Now using the dolly, I'mgoing to reach behind this panel with the dollyand I'm gonna push out on those low areas.
Also, while I'm pushing outI'm gonna have to remember where those high areas areso I can tap in on those.
Remember, we always wannawork in multiple directions.
Whatever tool you're using, just remember to push out on the lowsand in on the highs.
Also, when using adolly, there's different dollies, different shapes.
You want the shape of thedolly to fit the contour of the part you're working on.
If this dolly was completelyflat it wouldn't work well with this repair.
Okay, now I am working on getting my dolly located on the back of themetal where I want it to go.
It may take a little bitof time to get it exactly where you want it, but I wantit right on those low areas, so that I can raise the low areas out.
Also while I'm raising lowareas out, while I'm pushing on them with the dolly, I wannatap down on the high areas.
This will allow the lowareas to come out while the high areas are tapped in.
This is called the Hammeroff Dolly technique, because I'm not actuallyhammering on the dolly.
The dolly is pushing out on the low, the hammer's pushing in on the highs.
There is also a Hammer on Dolly, and that's where youare hitting the dolly.
Any time you hammer on dollythat stretches the metal.
You wanna save that for your final stages, until you get the metalcloser to where you want it.
Then you can do some hammer on dolly for your final straightening.
So I'm gonna do a little bitmore metal straightening, and then I'm gonna use the block sander with some 80 grit on it tocontinue blocking that out to identify my highs and lows and see how the progress is coming.
Now whenever you're blocksanding with 80 grit to identify highs andlows, it's always important to cross sand.
By sanding in just onedirection, you're not gonna find all the highs and lows.
And this goes for if you're doing this to identify highs and lows,or block sanding body filler.
Cross sanding always levels much better.
Now we're using this sander,and this basically takes the place of what we usedto use with thicker metals, which is a body file.
However a body file will actually shave the top layer of the metalwhich would help level it.
We don't wanna do thatwith thinner metals.
We wanna use methods thatdoes not remove any metal.
So any method that you canuse that does not remove metal is always gonna be a better choice with these thinner metals.
Now I'm feeling out thedamage with my hand, just seeing what all highsand lows that I feel.
A little tip for feeling damage, because you'll have to do that often, is to use the flat of your hand.
Often I see fingertipsused, but that is not gonna catch the highs and lows,you're gonna miss 'em.
So always use the flatof your hand to be able to feel the damage.
Another trick that sometechnicians use is to use a rag, they claim that they can feel it better, it kinda eliminatesthe different textures.
You put a rag over yourhand and go over the damage and see if you can feelthe highs and lows better.
Try both ways, whichever works best is the method for you to use.
Now I feel a little bit ofhigh, so here I identified a high, so I'm just gonna tap that down with the pick side of the hammer.
I'm just basicallylowering that high area.
Now I'm going to re-blockit, re-sand it with this 80 grit to make sure thatit did remove the high area.
I feel of it, and I feelthat that feels good.
It's not perfect, butwith these thin metals, if you try to get 'em just perfect, try to metal finish 'emlike they did older metals, you're gonna weaken and thin the metal.
You wanna get it within 1/4 of an inch.
Anywhere between 1/8 and 1/4 is what most body fillersuppliers recommend.
However, you don't wannaexceed 1/4 of an inch, that's maximum after sanded.
You don't wanna exceed that amount.
This dent is well underthat, it's probably within 1/8 of an inch.
I'm noticing there's stilla little bit of a crease down here so I need to work that out.
I'm gonna get a hammer and dolly in there, I'm gonna raise in on the low area and I'm gonna tap this crease area in so that we can roll this metal back to where it's supposed to be.
As I'm pushing out with the dolly, I'm tapping in on that high area.
Now I'm being real careful herenot to hit the bumper cover.
It'd've been a better idea if I went ahead and dropped the bumper cover.
I'll probably be blending into that.
Another trick you can do is put a couple layers of masking tape.
I should've did that, Ishould've put masking tape or went ahead and dropped the bumper.
Because the last thingyou wanna do is sand into an adjacent panel,especially if it's not one that you're blending and cause damage that you have to repair.
I'm still having problemswith the low area right here, so I'm working on that.
Now the problem with this area, it's a little harder to get to'cause there's a brace there.
I'm following the same techniques, I'm gonna push out on that low area and I'm tapping around the high areas.
When I hammer on dollyyou can hear that ping, it makes a different sound.
You can hammer on dolly someto help remove that damage, but again remember thatthat stretches the metal and try to reduce theamount that you do that.
Little bit of a high, I knocked that down.
Okay, I'm gonna use my block with 80 grit to sand the damaged area some more to see if I got thedamage worked out enough to apply the body filler.
And I sand it and I feelof it, and there's still too much of a low there.
So I'm going to need to goback in there one more time and use the dolly and hammer.
I'm going to use the pickbecause there's a high here.
I'm pushing out on thatlow and I'm going to hammer on dolly a little bit,and sand it one more time to see if that has it.
And that's what it takes, itjust takes doing a little bit, feeling of it, checking your progress until you have thedamage where you want it.
We got the metal straightenedwithin 1/4 of an inch, really within 1/8, but 1/4 after sanded is the maximum amount of filler that most body filler manufacturers recommend.
No more than 1/4 of an inch.
That's the maximum amount.
I know 3M, Evercoat, they all have that on their technical data sheets.
So anything more than 1/4 of an inch you really need tostraighten it more than that.
You need to get it straighter.
Again, with these thinnermetals you don't wanna try to work it and work it,because you're gonna work-harden the metal.
It'll become work-hardened, thin, brittle, it may even crack on you.
It's almost impossible toget these thinner metals to do the metal finishingtechniques like they used to do where they'd work the metaland file it down and get it just perfect, prime it.
Now there is one exceptionto that, and that's PDR.
Paintless Dent Repair.
That's a total different set of techniques than we went over in this video.
This video is straightening metal like a body shop would perform.
Again, remember dependingon the extent of damage, like a fender, that wouldreally go into consideration, do we wanna repair that or replace it? Now on 1/4 panel, thosepanels usually cost more.
And also, it's a weld onpanel, so it's gonna take a lot of labor to replace it.
So you can have a lotmore damage in 1/4 panel than you would a fender,and still repair it.
Many times in body shops and dealerships, if there's even a couple ofhours of damage on fenders, they just go ahead and replace them, which is R and R, Remove and Replace.
Anyway, I hope you learnedsomething this lesson.
Thanks for watching, we'llsee you in the next lesson.
How to Spot a Scam Auto Body Shop
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