Infiniti I30 (A33). Manual - part 151
PRECAUTIONS IN REPAIRING HIGH STRENGTH STEEL
29
Precautions in Repairing High Strength Steel (Cont’d)
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
o
C (1, 022
o
F)
Verify heating temperature with a thermometer.
(Crayon-type and other similar type thermometer are
available.)
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
(1.97 in).
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.