OPERA
TING INSTR
UCTIONS
42
MIG 140 INVERTER WELDER 058-9305-6
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. Select the wire diameter,
heat setting, and wire speed to lay a
continuous bead
(fig w)
.
3. Lap spot method: The welding arc is
directed to penetrate the bottom and top
pieces at the same time, and along each
side of the lap joint seam. Select the
wire diameter, heat setting, and tune in
the wire speed to lay a continuous bead
(fig x)
.
Instructions to be followed for spot welding
1.
Select the wire diameter and heat
setting recommended above for the
intended method of spot welding.
2.
Tune in the wire speed as if a
continuous weld is to be performed.
3. Hold the nozzle piece completely
perpendicular to and about ¼" off the
work piece.
4. Pull the trigger on the torch and release
it when the desired penetration is
achieved.
5. Make practice spot welds on scrap
metal and vary the duration of time of
holding the trigger until a desired spot
weld is made.
6. Make spot welds on the actual
work piece at desired locations.
fig w
MC-589305-52
fig x
MC-589305-53
