Nissan Murano Z51. Manual - part 324

REPAIRING HIGH STRENGTH STEEL

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PRECAUTION

REPAIRING HIGH STRENGTH STEEL

High Strength Steel (HSS)

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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:

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 because it may weaken the compo-
nent. When heating is unavoidable, never 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.)

• When straightening body panels, use caution in pulling any

HSS panel. Because HSS is very strong, pulling may cause
deformation in adjacent sections of the body. In this case,
increase the number of measuring points, and carefully pull
the HSS panel.

Tensile strength

Major applicable parts

370 - 590 MPa

• Lower front and rear hoodledge
• Upper hoodledge
• Side dash
• Roof bow No. 2 and No.4
• 3rd crossmember

(Front floor component part)

• Inner sill
• Rear side member assembly
• Rear seat crossmember
• Center rear crossmember assembly
• Inner side roof rail
• Inner center pillar
• Inner center front bumper reinforcement
• Front bumper stay
• Rear side bumper bracket
• Other reinforcements

780 - 1350 MPa

• Front side member assembly
• Front side member closing plate assembly
• Front side member extension
• Front side member center extension
• Outer roof rail reinforcement

(Side body assembly component part)

• 2nd crossmember

(Front floor component part)

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REPAIRING HIGH STRENGTH STEEL

• 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 (1.97 in).

• 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 MIG. welding. Do not use
gas (torch) for welding because it is inferior in welding
strength.

• Spot welding 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 condi-
tions. Always note the following when spot welding HSS:
• The electrode tip diameter must be sized properly according to

the metal thickness.

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REPAIRING HIGH STRENGTH STEEL

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

gaps.

• Follow the specifications for the proper welding pitch.

Unit: mm (in)

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Thickness (T)

Minimum pitch (L)

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 more
12 (0.47) or more
18 (0.71) or more
20 (0.79) or more
27 (1.06) or more
31 (1.22) or more

JSKIA0781ZZ

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< PREPARATION >

REPAIRING MATERIAL

PREPARATION

REPAIRING MATERIAL

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 Urethane foam for sealant (foam material) repair of material used on vehicle.

Read instructions on product for fill procedures.

Example of foaming agent filling operation procedure

1.

Fill procedures after installation of service part.

a.

Eliminate foam material remaining on vehicle side.

b.

Clean area after eliminating form insulator and foam material.

c.

Install service part.

d.

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

2.

Fill procedures before installation of service part.

a.

Eliminate foam material remaining on vehicle side.

b.

Clean area after eliminating foam insulator and foam material.

c.

Fill foam material on wheelhouse outer side.

<Urethane foam for foaming agent>

3M™ Automix™ Flexible Foam 08463 or equiva-
lent

1.

Urethane foam

A.

Nozzle insert hole

: Vehicle front

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