40
MIG 140 INVERTER WELDER 058-9305-6
Finishing the bead
1. During welding, the outer layer of the
electrode burns off to form a cover of
protective gases over the molten metal.
This prevents air from oxidizing the
molten metal and creates an undesirable
chemical reaction.
2. Remove the slag using a chipping
hammer or scratch brush. It appears as
an accumulation of dirty metal scale on
the finished weld
.
Welding position
1. Flat position: This position is easiest and
most commonly used. It is best to weld
in the flat position to achieve good
results
(fig r)
.
2. Horizontal position: It is same as flat
weld except the electrode angle which
should be about 30 degrees with respect
to the work piece. This prevents the
weld puddle from running downward
while allowing slow enough travel speed
to achieve good penetration. In this
position the electrode and arc force is
directed more toward the metal above
the weld joint
(fig s)
.