OPERA
TING INSTR
UCTIONS
37
MIG 180 INVERTER WELDER 058-9306-4
Arc too long:
•
The arc will result in a flat, wide weld
(fig 2Q)
.
•
The arc will result in a lot of splatter.
•
The arc will be unstable
.
Guidelines for a good weld bead
•
A solid weld bead requires that the
electrode be moved slowly and steadily
along the weld seam.
•
Moving the electrode rapidly or
erratically will prevent proper fusion or
create an uneven bead.
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 to
prevent contamination of the weld, and
the burning coating forms a slag.
2. Remove the slag using a chipping
hammer or scratch brush, as it appears
as an accumulation of dirty metal scale
on the finished weld
.
Note: The chipping process not only removes
the slag off the weld but also relieves the
internal strains developed by the heating and
cooling processes of welding.
MC-589306-52
fig 2Q
