High strength steel (HSS)
High strength steel is used for body panels in order to reduce vehicle weight.
Accordingly, precautions in repairing automotive bodies made of high strength steel are described below:
| Tensile strength | Nissan/Infiniti designation | Major applicable parts |
| 373 N/mm2 (38kg/mm2,54klb/sq in) | SP130 |
|
SP130 is the most commonly used HSS.
Read the following precautions when repairing HSS:
When heating is unavoidable, do not heat HSS parts above 550В°C (1,022В°F).
Verify heating temperature with a thermometer.
(Crayon-type and other similar type thermometer are appropriate.)


Instead, use a saw to avoid weakening surrounding areas due to heat. If gas (torch) cutting is unavoidable, allow a minimum margin of 50 mm (1.97in).

If spot welding is impossible, use M.I.G. welding. Do not use gas (torch) welding because it is inferior in welding strength.

Therefore, when cutting spot welds on a HSS panel, use a low speed high torque drill (1,000 to 1,200 rpm) to increase drill bit durability and facilitate the operation.

This work should be performed under standard working conditions.
Always note the following when spot welding HSS:




Handling of ultra high strength steel plate parts
PROHIBITION OF CUT AND CONNECTION
Do not cut and join the lower lock pillar reinforcement (center pillar reinforcement inside frame parts) because its material is high strength steel plate (ultra high strength steel plate).
The center pillar reinforcement must be replaced if this part is damaged.
Precaution for supplemental restraint system (SRS) "air bag" and "seat
belt pre-tensioner"
PreparationWindshield glass
Exploded View
Windshield glass molding
Spacer
Rubber dam
Windshield glass
Windshield insulator
Front pillar finisher
Instrument panel
Cowl top cover
Roof panel
Cowl top
Body side outer
Headlining
Adhesive
12 +2.0 mm (0.5 +0.08 in)
7 +2.0 mm (0.3 +0.08 in)
...
Warning/indicator lights and audible reminders
Anti-lock Braking System (ABS)
warning light
Brake warning light
Charge warning light
Door open warning light
Engine oil pressure warning
light
Low fuel warning light
Low tire pressure warning light
Low windshield-washer fluid
warning light
NISSAN Intelligent Key® lock
warni ...
Basic inspection
Diagnosis and repair workflow
Work flow
OVERALL SEQUENCE
DETAILED FLOW
1.GET INFORMATION FOR SYMPTOM
Get detailed information from the customer about the symptom (the condition
and the environment when the
incident/malfunction occurred).
>> GO TO 2
2.CONFIRM THE SYMPTOM
Try to ...