Nissan X-Trail 32. Manual - part 251

REPAIRING HIGH STRENGTH STEEL

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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:

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REPAIRING HIGH STRENGTH STEEL

Tensile strength

Major applicable parts

440 - 780 MPa

• Rear seat crossmember reinforcement

(Rear seat crossmember assembly component part) 

• Center front floor (Front)

(Center front floor component part) 

• Trans control reinforcement

(Center front floor component part) 

• Front floor (Front)

(Front floor component part) 

• 2nd crossmember

(Front floor component part) 

• 3rd crossmember

(Front floor component part) 

• Inner sill reinforcement

(Inner sill component part) 

• Side dash

(Side dash component part) 

• Inner front pillar reinforcement (RH only)

(Side dash component part) 

• Front suspension spring support

(Front strut housing assembly component part) 

• Front bumper stay
• Front side member closing plate (Front)

(Front side member closing plate component part) 

• Front side member flange

(Front side member closing plate component part) 

• Front tie down hook

(Front side member closing plate component part) 

• Front side member (Front)

(Front side member assembly component part) 

• Front side member brace

(Front side member assembly component part) 

• Front suspension mounting bracket
• Rear crossmember center assembly
• Rear side member

(Rear side member component part) 

• Rear side member rear reinforcement

(Rear side member component part) 

• Inner sill extension

(Rear side member component part) 

• Rear side member reinforcement

(Rear side member component part) 

• Outer rear anchor reinforcement

(Rear side member component part) 

• Rear spring mounting bracket

(Rear side member component part) 

• Spring mounting reinforcement

(Rear side member component part) 

• Rear side member extension
• Inner center pillar assembly (Lower)
• Outer front pillar reinforcement (Rear)
• Lower center pillar brace (Lower)
• Lower front pillar hinge brace
• Outer sill reinforcement
• Rear pillar gusset

(Inner rear pillar component part) 

• Rear pillar seat belt anchor

(Inner rear pillar component part) 

• Rear bumper stay

REPAIRING HIGH STRENGTH STEEL

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[FOR RUSSIA]

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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.

• 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).

Tensile strength

Major applicable parts

980 - 1500 MPa

• Front side member rear extension

(Front floor component part) 

• Inner sill
• Lower dash crossmember

(Lower dash complete component part) 

• Lower dash crossmember
• Front bumper armature assembly
• Front side member closing plate (Rear)

(Front side member closing plate component part) 

• Front side member (Rear)

(Front side member assembly component part) 

• Inner center pillar (Upper)

(Inner center pillar assembly component part) 

• Upper center pillar brace

(Inner center pillar assembly component part) 

• Center pillar seat belt anchor

(Inner center pillar assembly component part) 

• Outer front pillar reinforcement

(Outer front pillar reinforcement component part) 

• Center pillar hinge brace (Upper)

(Lower center pillar brace component part) 

• Center pillar extension

(Lower center pillar brace component part) 

• Inner center rear bumper reinforcement

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REPAIRING HIGH STRENGTH STEEL

• 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.

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

gaps.

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