B4 Non-Structural Analysis and Damage Repair

  • Frame Inspection and Repair
  • Unibody and Unitized Structure Inspection, Measurement, and Repair
  • Stationary Glass
  • Welding, Cutting, and Joining

Non-Structural Analysis and Damage Repair

A. Frame Inspection and Repair (16 questions)

1. Diagnose, repair, verify, and document repairs on underbody and upperbody structural damage using three-dimensional measuring systems (mechanical, electronic/computerized, laser), and dedicated or universal fixtures, in accordance with vehicle manufacturer/industry recommended procedures.

2. Check the vehicle with a tram gauge to determine further diagnostic procedures.

3. Lift, anchor, and support vehicle for repair and realignment.

4. Repair and align mash/collapse damage (change in length from body zero).

5. Repair and align sag/kickup damage (change in height from datum).

6. Repair and align sidesway/sway damage (change in width from centerline).

7. Repair and align twist damage (vertical misalignment in the center section).

8. Repair and align diamond damage.

9. Diagnose, repair, or replace damaged frame, frame horns, side rails, cross members, frame brackets, supplemental restraint system (SRS) mounting locations, and front, rear, or center sections in accordance with vehicle manufacturer/ industry recommended procedures.

10. Replace protective coatings, restore corrosion protection to repaired or replaced frame areas and anchoring locations.

11. Repair or replace stress-cracked frame members in accordance with vehicle manufacturer/industry recommended procedures.

12. Diagnose damaged mounting locations for steering, suspension, and powertrain components, which can cause vibration, steering, and wheel alignment problems, in accordance with vehicle manufacturer/ industry recommended procedures.

13. Perform stress-relieving procedures in accordance with vehicle manufacturer/industry recommended procedures.

14. Determine the direction of impact and the extent of direct and indirect damage.

15. Identify the frame type and composition; plan the methods and sequence of repair in accordance with vehicle manufacturer/industry recommended procedures.

B. Unibody and Unitized Structure Inspection, Measurement, and Repair (18 questions)

1. Diagnose, repair, verify, and document repairs on underbody and upperbody structural damage using three-dimensional measuring systems (mechanical, electronic/computerized, laser), and dedicated or universal fixtures, in accordance with vehicle manufacturer/industry recommended procedures.

2. Check the vehicle with a tram gauge to determine further diagnostic procedures.

3. Lift, anchor, and support vehicle for repair and realignment.

4. Repair and align mash/collapse damage (change in length from body zero).

5. Repair and align sag/kickup damage (change in height from datum).

6. Repair and align sidesway/sway damage (change in width from centerline).

7. Repair and align twist damage (vertical misalignment in center section).

8. Repair and align diamond damage.

9. Diagnose damaged mounting locations for steering, suspension, and powertrain components, which can cause vibration, steering, and wheel alignment problems, in accordance with vehicle manufacturer/industry recommended procedures.

10. Identify, diagnose, repair or replace the supplemental restraint system (SRS) and driver assistance systems sensor component mounting locations (collision avoidance, adaptive cruise control, park assist, etc.).

11. Determine the direction of impact and the extent of direct and indirect damage.

12. Identify the structural composition; plan the methods and sequence of repair, in accordance with vehicle manufacturer/industry recommended procedures.

13. Repair, align, and/or replace center section components (cowl, bulkhead, roof, roof rails, pillars, floor, stationary glass openings, door openings, rocker panels, and crossmembers).

14. Repair, align, and/or replace rear section components (quarter panels, rear compartment opening, package shelf, wheelhouse assemblies, rear body panel, rails, floor pans, crossmembers, and the mounting points of suspension and powertrain components).

15. Repair, align, and/or replace front section components (aprons, strut towers, upper and lower rails, crossmembers, and the mounting points of steering, suspension, and powertrain components).

16. Perform stress-relieving procedures in accordance with vehicle manufacturer/industry recommended procedures.

17. Replace protective coatings; restore corrosion protection to repaired or replaced unibody structural areas and anchoring locations.

18. Restore noise, vibration, harshness (NVH) materials and structural foams in accordance with manufacturer/industry recommended procedures.

C. Stationary Glass (4 questions)

1. Identify, remove and/or replace front and rear modular/stationary glass, including heated, non-heated; and glass equipped with electronic accessories (cellular, satellite, collision avoidance, antenna, rain sensor, etc.) in accordance with manufacturer/industry recommended procedures.

2. Identify, remove and/or replace side and roof modular/stationary glass including glass equipped with electronic accessories in accordance with manufacturer/industry recommended procedures.

3. Determine correct pinch weld preparation, adhesive selection and application in accordance with manufacturer/industry recommended procedures.

D. Welding, Cutting, and Joining (12 questions)

1. Identify the structural composition; determine correct welding/joining process in accordance with vehicle manufacturer/industry recommendations (GMAW, MIG/MAG, MIG brazing, Squeeze-Type Resistance Spot); identify the electrode, wire type, diameter, and gas to be used in specific welding situations

2. Set up and adjust welding equipment for the material to be welded (steel, aluminum).

3. Determine proper welding technique (push, pull, and gun angle) for the type of welds being made.

4. Protect all vehicle systems and components from damage during welding and cutting operations.

5. Prepare the metal to be joined; assure good joint fit-up.

6. Identify the type of weld/bonded joint (butt, lap, etc.) for the repair being made.

7. Determine the correct type of weld (continuous, stitch, skip, plug, spot, etc.) and preparation for each specific welding operation.

8. Identify the causes of welding defects (burn through, cracks in metal, cratering, porosity, improper penetration, excessive spatter, distortion, and waviness of bead); make necessary adjustments.

9. Identify the proper cutting process (abrasive, mechanical, plasma arc) for different

materials and locations in accordance with vehicle manufacturer/industry

recommended procedures.

10. Remove damaged structural steel and aluminum components; replace in accordance with vehicle manufacturer’s/industry recommended procedures.

11. Restore protective coatings; restore corrosion protection before or after welding operation.

12. Remove and install welding/weld-bonded panels according to manufacturer specifications.

13. Identify structural composition; determine the correct riveting and/or adhesive bonding process in accordance with vehicle manufacturer/industry recommendations.

14. Perform test weld; visually evaluate and destructive test each weld type (continuous, skip, STRSW, plug, etc.).