Infiniti QX56 (JA60). Manual - part 161

BRM-38

< SERVICE INFORMATION >

BODY REPAIR

Precaution in Repairing High Strength Steel

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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:

High strength steel (hss) used in nissan vehicles

SP130 is the most commonly used HSS.
SP150 HSS is used only on parts that require much more strength. 

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

• The repair of reinforcements (such as side members) by heat-

ing 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 appropri-

ate.)

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Tensile strength

Nissan/Infiniti designation

Major applicable parts

373 N/mm

2

(38kg/mm

2

 ,54klb/sq in)

SP130

• Front inner pillar upper
• Front pillar hinge brace
• Outer front pillar reinforcement
• Other reinforcements

785-981 N/mm

2

(80-100kg/mm

2

114-142klb/sq in)

SP150

• Outer sill reinforcement
• Main back pillar

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BODY REPAIR

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• 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 possi-

ble 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 ordi-

nary 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.

• SP150 HSS panels with a tensile strength of 785 to 981 N/

mm

2

  (80 to 100 kg/mm

2

 , 114 to 142 klb/sq in), used as rein-

forcement in the door guard beams, is too strong to repair.

When these HSS parts are damaged, the outer panels also

sustain substantial damage; therefore, the assembly parts

must be replaced.

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BRM-40

< SERVICE INFORMATION >

BODY REPAIR

2. Precautions in spot welding HSS

This work should be performed under standard working condi-

tions. 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.

Unit:mm

Foam Repair

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During factory body assembly, foam insulators are installed in certain body panels and locations around the

vehicle. Use the following procedure(s) to replace any factory-installed foam insulators.

URETHANE FOAM APPLICATIONS

Use commercially available spray foam for sealant (foam material) repair of material used on vehicle. Read

instructions on product for fill procedures.

FILL PROCEDURES

1. Fill procedures after installation of service part.

-

Remove foam material remaining on vehicle side.

-

Clean area in which foam was removed.

-

Install service part.

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Thickness (t)

Minimum pitch ( )

0.6 (0.024)
0.8 (0.031)
1.0 (0.039)
1.2 (0.047)
1.6 (0.063)
1.8 (0.071)

10 (0.39) or over
12 (0.47) or over
18 (0.71) or over
20 (0.79) or over
27 (1.06) or over
31 (1.22) or over

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BODY REPAIR

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Insert nozzle into hole near fill area and fill foam material or fill in enough to close gap with the service

part.

2. Fill procedures before installation of service part.

-

Remove foam material remaining on vehicle side.

-

Clean area in which foam was removed.

-

Fill foam material on wheelhouse outer side.

NOTE:

Fill in enough to close gap with service part while avoiding flange

area.

-

Install service part.

NOTE:

Refer to label for information on working times.

Replacement Operation

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DESCRIPTION

This section is prepared for technicians who have attained a high level of skill and experience in repairing col-

lision-damaged vehicles and also use modern service tools and equipment. Persons unfamiliar with body

repair techniques should not attempt to repair collision-damaged vehicles by using this section.

Technicians are also encouraged to read Body Repair Manual (Fundamentals) in order to ensure that the orig-

inal functions and quality of the vehicle can be maintained. The Body Repair Manual (Fundamentals) contains

additional information, including cautions and warnings, that are not including in this manual. Technicians

should refer to both manuals to ensure proper repairs.

Please note that this information is prepared for worldwide usage, and as such, certain procedures may not

apply in some regions or countries.

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