MITO Collision Repair L4 key terms

A vehicle construction where the body panels and floor form the main load-bearing structure, rather than a separate frame. Damage to one area can affect overall structural strength and crash behavior.

A body-and-frame integrated design in which stamped steel panels are welded together to carry loads. Repairs must restore both appearance and structural integrity, so measuring and weld quality matter.

Construction where a separate steel or aluminum ladder frame carries the load and a body shell mounts on top. Frame straightening and body mounting points are separate repair concerns.

A deliberately engineered front or rear section designed to deform and absorb collision energy before it reaches the passenger compartment. Repairers must restore its intended deformation behavior.

The design principle of directing and dissipating crash forces through controlled deformation, joints, and load paths. Repairs that add stiffness in the wrong place can make occupants less safe.

The route crash or suspension forces travel through a structure to the ground or opposing structure. Correct sectioning and welding keep load paths continuous after a repair.

Replacing a damaged portion of a panel or rail with a new piece joined at a manufacturer-approved cut location. Cutting outside approved zones or skipping backing plates weakens the structure.

A heavy repair rack with anchoring clamps and measuring references used to hold a vehicle and pull structural damage back to specification. It relies on accurate datum and control-point measurements.

Using hydraulic pulls and anchoring to return a bent frame or unibody structure to its original dimensions. Overpulling or pulling without measuring can leave hidden misalignment.

A reference location defined by the vehicle maker, used with measuring systems to check whether structure sits at the correct height and position. Measurements are compared to published specifications.

A specific hole, bolt, or feature on the body or frame used as a measuring reference. Comparing control-point readings reveals sway, sag, mash, or diamond damage.

A sideways shift of the front or rear structure relative to the rest of the vehicle, often from an offset impact. It shows up as control points displaced laterally on a measuring system.

A shortening of the vehicle structure, typically from a direct front or rear impact that pushes the rails back. Control-point readings show reduced length compared with specifications.

A condition where one side of the vehicle is pushed rearward relative to the other, skewing the structure into a diamond shape in plan view. It is diagnosed by comparing cross-measurements.

The factory joining method that passes current through overlapping panels under electrode pressure to form a weld nugget. Replacement welds must match count, spacing, and location specified by the maker.

A weld made by filling a punched or drilled hole in the outer panel to fuse it to the panel beneath. It is a common substitute where a squeeze-type spot welder cannot reach.

A joint where two panel edges meet and a backing plate or insert is placed behind the seam to support the weld. It is often required at sectioning joints on high-strength steel.

A conductive coating applied to mating surfaces before welding to limit corrosion between panels. It must be used where the maker specifies and must not be confused with ordinary primer.

Corrosion caused when two dissimilar metals, such as steel and aluminum, are joined and an electrolyte bridges them. Isolation barriers and correct fasteners prevent it at mixed-material joints.

Steel grades with elevated yield strength used for crash structures and reinforcements. They often resist conventional straightening and require maker-approved heating, sectioning, and welding procedures.

Very high tensile grades, often above roughly 780 MPa, used in occupant-protection structures. Many are not repairable by straightening or heat and must be replaced per manufacturer instructions.

The area of metal next to a weld whose properties change because of welding heat. On advanced steels it can lose strength, so makers limit heat input and specify joining methods.

Repair of aluminum body structures using dedicated tools, clean work areas, and methods that avoid steel contamination. Aluminum requires different welding, riveting, and bonding procedures than steel.

A fastener driven through overlapping aluminum panels that flares without a pre-drilled hole. It is common in aluminum-intensive bodies and needs correct rivet type, spacing, and tool setup.

A structural two-part adhesive used to join panels, often combined with rivets or welds. It distributes stress and seals the joint, but only approved products and cure times may be used.

A diagnostic scan performed before repairs to record stored fault codes and module configuration. It documents the vehicle's electronic state and reveals systems that may need recalibration later.

A diagnostic scan after body and paint work to confirm no fault codes remain and all modules communicate correctly. It verifies that repairs and battery disconnects did not create electronic faults.

The aiming or relearning of advanced driver assistance sensors such as cameras and radar after windshield, bumper, or suspension work. It requires specified targets, distances, and conditions.

Checking the supplemental restraint system, including airbags, pretensioners, sensors, and wiring, after a collision. Deployed or damaged components must be replaced and codes cleared per maker procedure.

The procedures for de-energizing and isolating electric and hybrid vehicle battery systems before repair. Only trained personnel using insulated tools and lockout steps may work on these systems.

The process of choosing and adjusting a refinish formula so a repaired panel blends with adjacent panels under different light. Variant selection, spray-out cards, and blending are key steps.

An undamaged adjacent panel onto which color is faded to hide a repair edge. Blending avoids a visible color difference where a panel-to-panel match is imperfect.

A coating applied over prepared bodywork to fill minor imperfections and provide adhesion for topcoat. It is sanded smooth and sealed before color is applied.

The transparent topcoat that provides gloss and protects the color layer from sunlight and contamination. Its film build and cure affect durability and appearance of the finished repair.

A filtered, temperature-controlled enclosure for spraying and baking refinish coatings. Controlled airflow keeps dust out and protects workers from overspray and solvent vapor.

An additional estimate request submitted when hidden damage is found after repairs begin. It documents extra parts and labor for insurer approval before work continues.

A written evaluation of collision damage listing parts, labor operations, and refinish hours needed to restore the vehicle. It forms the basis for the repair order and insurance claim.

A determination that repair cost exceeds the vehicle's value or a state threshold, so the insurer settles instead of repairing. Salvage branding and owner options then apply.