OPERATING INSTRUCTIONS
40
MIG 180 INVERTER WELDER 058-9306-4
2. Fillet weld joint: Most fillet weld joints on
metals of moderate to heavy thickness
will require multiple pass welds to
produce strong joint. The multiple pass
beads can be laid in three passes into a
T fillet joint and a lap fillet joint
(fig 2Y)
.
Spot welding:
There are three methods of spot welding:
1. Burn-through method: In this method,
two overlapped metal pieces are welded
together by burning through the top
piece and into the bottom piece.
Self-shielding, flux core wire of 0.035"
is suitable for this method. Always select
the high heat setting for this method and
tune in the wire speed prior to making a
spot weld
(fig 2Z)
.
Note: Do not use 0.030" self-shielding flux
core wires when using this method unless the
metal is very thin or excessive filler metal and
minimal penetration is acceptable.
2. Punch and fill method: In this method, a
hole is punched or drilled into the top
piece of metal and the arc is directed
through the hole to penetrate into the
bottom piece. The puddle is allowed to
fill up the hole leaving a spot weld that
is smooth and flush with the surface of
the top piece
(fig 3A)
.
fig 2Y
1
1
2
3
2
3
Lap Joint Welded
In Three Passes
T Joint in
Three Passes
MC-589306-60
fig 2Z
MC-589306-61
fig 3A
MC-589306-62
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