The laser-measure frame rack. Modern frame repair starts on a laser-measure rack — Car-O-Liner, Chief Genesis, Celette, or Spanesi systems. The vehicle is anchored to the rack and measured against factory specifications in 3D using laser sensors at over 60 reference points. Pulls are applied gradually with hydraulic towers, and measurements are re-taken after every pull until every reference point is within OEM tolerance (typically 3mm). Without laser measurement, a tech is guessing whether the frame is straight — and 'looks straight' is not the same as 'is straight'. A frame that's 5-10mm off spec will pull, vibrate, eat tires, and crash poorly. OAB runs Car-O-Liner across all 3 active locations.
Material-specific repair procedures. Different parts of the frame are made of different materials with different repair rules. Mild steel: heat and pull are acceptable in most areas. High-strength steel: heat is restricted to specific zones; some areas can't be heat-treated. Ultra-high-strength steel (boron steel): no heat allowed; damaged sections must be cut and replaced as full sections, not repaired. Aluminum: cannot be welded with steel equipment (cross-contamination causes corrosion); requires dedicated aluminum weld bay and clean tools. Mixed-material vehicles (most modern luxury and many domestic SUVs) require techs who know exactly what material they're touching at every step.
OEM-approved weld procedures. Manufacturers publish specific welding requirements: weld type (MIG, MAG, spot, plug), wire spec, gas mix, amperage range, and weld pattern (continuous vs stitch vs spot at specified intervals) — see the aggregated library at OEM1Stop. Using the wrong weld type or pattern compromises the structural performance of the joint — the joint may pass cosmetic inspection but fail in a subsequent crash. OEM-certified shops have signed agreements to follow these procedures, use approved equipment, and document compliance. Non-certified shops often substitute familiar welding methods with no auditable trail. OAB is OEM-certified for FCA, Hyundai, Infiniti, Kia, and Nissan and follows position statements for the other major manufacturers.
ADAS recalibration after frame work. Almost every modern vehicle has cameras, radar, and ultrasonic sensors mounted on or in the frame structure — see I-CAR's ADAS calibration guidance. Frame work — even minor — moves these sensors out of factory alignment, sometimes by a fraction of a degree but enough to make them unreliable. Forward camera off by 0.5° at speed: lane-keep assist points off-lane. Front radar off by 1° vertically: adaptive cruise misjudges distance. Surround cameras off in any axis: parking assist guides you into things. Static recalibration (at the shop, on a calibration mat) re-establishes baseline alignment. Dynamic recalibration (test drive on calibrated routes) confirms real-world performance. Both are required after frame work on most ADAS-equipped vehicles.
Why a generalist body shop can't do this work safely. Generalists may have a frame puller (chain-and-tower system) but rarely have laser measurement. They may have welders but not the OEM-approved equipment or the certifications to use them. They may sublet ADAS calibration but the sublet adds days and points of failure. They may not have material-specific procedure manuals on file. The result: cars that 'pass inspection' visually but are structurally compromised and rarely measure correctly when checked by a specialist. Insurance adjusters increasingly require shop certifications on structural repairs to avoid liability — many AZ carriers won't pay for structural work at non-certified shops.
What to ask a shop before authorizing frame repair. 'Do you have a laser-measure frame rack?' (Car-O-Liner, Chief, Celette, or Spanesi — yes is the only acceptable answer.) 'Are you OEM-certified for my vehicle make?' (Should match your manufacturer.) 'Do you do ADAS calibration in-house?' (In-house preferred over sublet.) 'Will you provide pre-repair and post-repair measurement reports?' (Should be yes — these go in your file and are admissible in any future dispute.) 'What's your written warranty on structural repair?' (Should be lifetime workmanship.) If any answer is fuzzy, find another shop.