WELDING
BASE OF BODY REPAIR
9-2
WELDING
WELDING
M4090001000025
Welding is the partial joining of two or more metals
by deposition; the welding methods used for body
maintenance and repair can be classified into the fol-
lowing methods.
FUSION WELDING
Fusion welding is a method of welding in which the
weld connection is made by forming or supplying the
weld metal at the part where the weld is to be made.
PRESSURE WELDING
Pressure welding is a method of welding in which the
weld connection is made by applying external pres-
sure while the part where the weld is to be made is in
a molten or semi-molten condition.
BRAZING
Brazing is a method of welding in which the weld
connection is made by supplying a filler metal (which
is molten at a temperature lower than the melting
temperature of the base metal) at the place where
the joining is to be made without melting the base
metal itself.
ELECTRIC RESISTANCE SPOT WELDING
M4090002000017
Electric resistance spot welding is a method for fus-
ing metal parts together. Two or three metal sheets
are positioned between two copper-alloy electrode
tips, and pressure and a large current are then
applied, thus causing the contacting surfaces to heat
up and fuse together because of the electric contact
resistance.
ADVANTAGES OF ELECTRIC
RESISTANCE SPOT WELDING
• Because the time required for welding at each
point is brief, the work can be done quickly and at
reduced cost.
• Because both metals are fused and pressure
applied to make the weld, the strength and reli-
ability are both high.
• Because the time required to make the welds is
short, there is little occurrence of distortion of the
panel due to heat.
.
Welding methods
Fusion methods Shielded arc welding
Gas welding
Electric resistance spot welding
CO
2 gas arc welding
Pressure methods
[Temperature approximatery 1,500˚C (2,732˚F) or higher at weld area]
Brazing methods Brazing
Soldering
Temperature: 620˚C - 950˚C
(1,148˚F - 1,742˚F)
Temperature: 183˚C - 310˚C
(361˚F - 590˚F)
Temperature: 1,130˚C - 1,550˚C
(2,066˚F - 2,822˚F)
AB200025
AB
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