Mitsubishi MOTORS Lancer Evolution 2008, Body Repair Manual, Page: 68 / 186

WELDING
TSB Revision
BASE OF BODY REPAIR 9-8
CHECKING NUGGET STRENGTH FOLLOWING
SPOT WELDING
CAUTION
•
Stop wedging the tip or the chisel or flat-tipped screw-
driver as soon as the size of the nuggets can be deter-
mined; do not wedge it in more than 30 mm (1.18
inches).
•
After checking the nugget diameter, correct the place
where the checking was done.
Wedge the tip of a chisel or flat-tipped (-) screwdriver into the
space between two weld points.
•
The nuggets should not break apart.
•
The nugget diameter should be 3 mm (0.12 inch) or more.
GAS SHIELD ARC WELDING
M4090003000043
Gas shielded arc welding is one method of arc weld-
ing. In this method, while the area to be welded is
shielded from the air by a layer of inert gas (such as
argon) or carbon dioxide gas, the filler metal (wire) is
fed from the torch nozzle at a constant rate and an
electric arc is generated between the tip of the wire
and the area being welded, thus generating heat to fuse the area. There are two types of gas shielded
arc welding, classified according to the gas they use
as the shield gas: carbon dioxide (CO
2
) gas shielded
arc welding, and MIG welding, which uses an inert
gas (such as argon).
However, herein we will refer to all gas shielded arc
welding as MIG welding.
AB200033AC
3 mm (0.12 in)
AB200033
AB301456
Nozzle
Wire
Contact tip
Metal vapor
Shield gas
AD AB301456