Modern vehicles aren't welded sheet metal with paint. They're computers with crumple zones, built from materials that require specific equipment and training to repair. If your shop doesn't know the difference, your car is at risk.
A 2005 Toyota Camry was built primarily from mild steel. A 2025 Toyota Camry is a composite of boron steel, ultra-high-strength steel, aluminum, and magnesium, with a few plastic composites thrown in. Visually, they look similar. Structurally and metallurgically, they are completely different vehicles. And the difference has everything to do with how they are repaired, whether they can be repaired, and what happens when they can't be.
The materials have gotten complicated
Modern vehicle manufacturers have spent the last 15 years replacing mild steel with advanced materials to reduce weight and improve crash performance. A typical 2024 vehicle might contain:
Boron steel in the A-pillars, B-pillars, and rocker reinforcements. Tensile strength around 1,500 MPa, roughly five times stronger than mild steel. Designed to not deform in a crash. When boron steel fails, it fractures brittlely, it doesn't bend.
Ultra-high-strength steel (UHSS) in the roof rails, door intrusion beams, and crash structure. Tensile strength 780-1,000 MPa.
Aluminum in the hood, fenders, doors, and sometimes the entire body structure on premium vehicles. Requires entirely different welding, cutting, and bonding techniques than steel.
Magnesium castings in seat frames, dash structure, and transfer cases. Flammable when ground or welded incorrectly.
Each of these materials has manufacturer-specific repair procedures that are non-negotiable. You cannot heat boron steel to straighten it; the heat destroys its tensile properties. You cannot weld aluminum on the same bench used for steel; cross-contamination creates galvanic corrosion. You cannot section an aluminum rail the same way you section a steel one; the manufacturer specifies rivet-and-bond, not weld.
What goes wrong at the wrong shop
A shop without advanced-materials training will default to what they know, which is steel repair. On a boron-steel pillar, that means heating and straightening, destroying the engineered strength. On an aluminum panel, that means steel-compatible grinders and welders, which cross-contaminates the aluminum and introduces long-term corrosion. On a UHSS rail, that means incorrect sectioning that fails to restore crush-zone performance.
The damage doesn't show up at delivery. It shows up in the next collision.
A properly repaired modern vehicle performs in a crash exactly as the manufacturer engineered it. An improperly repaired one does not, and there is no visible indicator to tell them apart. Crash testing, airbag deployment timing, and occupant protection are all downstream of the structural repair being done to spec.
I-CAR Gold Class is the minimum bar
I-CAR (Inter-Industry Conference on Auto Collision Repair) is the training body that certifies shops on current advanced-materials procedures. Gold Class is their highest recognition, requiring every production-role technician to complete ongoing annual training on the materials and procedures current vehicles use. Fewer than 10% of collision shops nationwide hold Gold Class.
If your vehicle is newer than about 2018 and has any structural damage, Gold Class is the minimum you should accept from a shop. Anything less is the shop guessing on your car.
What to ask your shop
Before authorizing a repair on a modern vehicle, ask three questions:
First: Are you I-CAR Gold Class certified? Ask for the certification number and verify it on i-car.com.
Second: Do you have separate equipment for aluminum and steel? Cross-contamination is a real and common failure mode.
Third: Are you following the manufacturer's repair procedure for my specific VIN? A real shop will pull the OEM procedure from ALLDATA, OEM1Stop, or the manufacturer's portal before starting the job. A shop that says "we've done a hundred of these" and doesn't reference the procedure is guessing.
If the answers to any of those questions make you uncomfortable, find a different shop. Your vehicle is a safety device, and the repair that restores it needs to be done correctly, not just quickly.
Frequently Asked
How do I know what materials my vehicle is made from?
Your vehicle's body repair manual, available through manufacturer portals or services like ALLDATA, documents the materials used in each structural component. A certified shop pulls this manual before starting any structural repair.
Can damaged boron steel be repaired or does it have to be replaced?
Boron steel components are almost always replaced, not repaired. The engineered properties come from a specific heat-treatment process that cannot be restored after fracturing. Attempting to straighten or weld boron steel usually makes the component weaker than a proper replacement.
Why does aluminum require separate equipment?
Aluminum and steel are galvanically incompatible. Grinding dust, welding spatter, or tool debris from steel that contacts an aluminum repair introduces corrosion that can fail months or years later. Shops with aluminum capability maintain physically separate work bays, tools, and extraction systems.