Automobile collision repairers repair the damage vehicles sustain in traffic accidents and through normal wear. Repairers straighten bent bodies, remove dents, and replace parts that are beyond repair. Just as a variety of skills are needed to build an automobile, so a range of skills is needed to repair body damage to vehicles. Some body repairers specialize in certain areas, such as painting, welding, glass replacement, or air bag replacement. All collision repairers should know how to perform common repairs, such as realigning vehicle frames, smoothing dents, and removing and replacing panels.
Vehicle bodies are made from a wide array of materials, including steel, aluminum, metal alloys, fiberglass, and plastic, with each material requiring a different repair technique. Most repairers can work with all of these materials, but as car manufacturers produce vehicles with an increasing proportion of lightweight fiberglass, aluminum, and plastic parts, more repairers specialize in repairing these specific materials.
Collision repairers frequently must remove car seats, accessories, electrical components, hydraulic windows, dashboards, and trim to get to the parts that need repair. If the frame or a body section of the vehicle has been bent or twisted, frame repairers and straighteners can sometimes restore it to its original alignment and shape. This is done by chaining or clamping it to an alignment machine, which uses hydraulic pressure to pull the damaged metal into position. Repairers use specialty measuring equipment to set all components, such as engine parts, wheels, headlights, and body parts, at manufacturer's specifications.
After the frame is straightened, the repairer can begin to work on the car body. Newer composite car bodies often have "panels" that can be individually replaced. Dents in a metal car body can be corrected in several different ways, depending on how deep they are. If any part is too badly damaged to repair, the collision repairers remove it with hand tools, a pneumatic metal-cutting gun, or acetylene torch, and then weld on a replacement. Some dents can be pushed out with hydraulic jacks, pneumatic hammers, prying bars, and other hand tools. To smooth small dents and creases, collision repairers may position small anvils, called dolly blocks, against one side of the dented metal. They then hit the opposite side of the metal with various specially designed hammers. Tiny pits and dimples are removed with pick hammers and punches. Dents that cannot be corrected with this treatment may be filled with solder or a puttylike material that becomes hard like metal after it cures. When the filler has hardened, the collision repairers file, grind, and sand the surface smooth in the correct contour and prepare it for painting. In many shops the final sanding and painting are done by other specialists, who may be called automotive painters.
Since more than the body is usually damaged in a major automobile accident, repairers have other components to repair. Advanced vehicle systems on new cars such as anti-lock brakes, air bags, and other "passive restraint systems" require special training to repair. Steering and suspension, electrical components, and glass are often damaged and require repair, removal, or replacement.
Automotive painting is a highly skilled, labor-intensive job that requires a fine eye and attention to detail for the result to match the pre-accident condition. Some paint jobs require that less than the whole vehicle be painted. In this case, the painter must mix pigments to match the original color. This can be difficult if the original paint is faded, but computer technology is making paint matching easier.
A major part of the automobile collision repairer's job is assessing the damage and providing an estimate on the cost to repair it. Sometimes, the damage to a vehicle may cost more to repair than the vehicle is worth. When this happens, the vehicle is said to be "totaled," a term used by collision repairers as well as insurance companies. Many body repair shops offer towing services and will coordinate the transfer of a vehicle from the accident scene as well as the transfer of a totaled vehicle to a scrap dealer who will salvage the useable parts.
The shop supervisor or repair service estimator prepares the estimate. They inspect the extent of the damage to determine if the vehicle can be repaired or must be replaced. They note the year, model, and make of the car to determine type and availability of parts. Based on past experience with similar types of repair and general industry guidelines, estimates are calculated for parts and labor and then submitted to the customer's insurance company. One "walk around" a car will tell the collision repairer what needs to be investigated. Since a collision often involves "hidden" damage, supervisors write up repair orders with specific instructions so no work is missed or, in some cases, done unnecessarily. Repair orders often indicate only specific parts are to be repaired or replaced. Collision repairers generally work on a project by themselves with minimal supervision. In large, busy shops, repairers may be assisted by helpers or apprentices.
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