Nissan Xterra. Instruction — part 154
BRM-36
< REMOVAL AND INSTALLATION >
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 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.
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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REPAIRING HIGH STRENGTH STEEL
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• Follow the specifications for the proper welding pitch.
Unit: mm (in)
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 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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BRM-38
< REMOVAL AND INSTALLATION >
REPLACEMENT OPERATIONS
REPLACEMENT OPERATIONS
Replacement Operation
INFOID:0000000009484356
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 Instruction (Fundamentals) in order to ensure that the orig-
inal functions and quality of the vehicle can be maintained. The Body Repair Instruction (Fundamentals) contains
additional information, including cautions and warnings, that are not including in this instruction. Technicians
should refer to both instructions 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.
REPLACEMENT OPERATIONS
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The symbols used in this section for cutting and welding / brazing operations are shown below.
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