Nissan Altima (L32) 2007-2012 Service Manual ≻ Body repair sedan ≻ On-vehicle repair ≻ Precautions in repairing high strength steel

Nissan Altima (L32) 2007-2012 Service Manual: Precautions in repairing high strength steel

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:

SP130 is the most commonly used HSS.

Read the following precautions when repairing HSS: 1. Additional points to consider

• The repair of reinforcements (such as side members) by heating is not recommended since it may weaken the component.

When heating is unavoidable, do not heat HSS parts above 550°C (1,022°F).

Verify heating temperature with a thermometer.

(Crayon-type and other similar type thermometer are appropriate.)

• When straightening body panels, use caution in pulling any HSS panel. Because HSS is very strong, pulling may cause deformation in adjacent portions of the body. In this case, increase the number of measuring points, and carefully pull the HSS panel.

• When cutting HSS panels, avoid gas (torch) cutting if possible.

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).

• When welding HSS panels, use spot welding whenever possible in order to minimize weakening surrounding areas due to heat.

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

• The spot weld on HSS panels is harder than that of an ordinary steel panel.

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.

2. Precautions in spot welding HSS

This work should be performed under standard working conditions.

Always note the following when spot welding HSS: • The electrode tip diameter must be sized properly according to the metal thickness.

• The panel surfaces must fit flush to each other, leaving no gaps.

• Follow the specifications for the proper welding pitch.

Body alignment

Body Center Marks A mark has been placed on each part of the body to indicate the vehicle center. When repairing parts damaged by an accident which might affect the vehicle frame (members, pillar ...

Replacement operations

Description This section is prepared for technicians who have attained a high level of skill and experience in repairing collision- damaged vehicles and also use modern service tools and equipmen ...

Other materials:

Remote Engine Start
The button will be on the NISSAN Intelligent Key if the vehicle has Remote Engine Start. This feature allows the engine to start from outside the vehicle. The following features may be affected when Remote Engine Start is used: Vehicles with a manual climate control system (if so equipped )will ...

Radio
Place the ignition switch in the ACC or ON position and press the PUSHbutton to turn the radio on. If you listen to the radio with the engine not running, the ignition switch should be placed in the ACC position. Radio reception is affected by station signal strength, distance from radio transmitte ...

Engine compartment check locations
2.0L 4 cylinder (KR20DDET engine model) Engine coolant reservoir Drive belt location Engine oil filler cap Brake fluid reservoir Battery Fuse/Fusible link box Air cleaner Radiator cap Engine oil dipstick Windshield-washer fluid reservoir NOTE: Your vehicle may not be equipped with an en ...