Jasic MIG160PFC, Manual

Page: 52 / 70

Page 52
9.3. Common MIG malfunction
When the welding conditions do not meet the requirements, the phenomena described in the
following table will occur:
Table 9.3 Common MIG malfunction
Unsuitable
Welding
Condition
Result
Unsuitable
Welding Condition
Result
The wire
stick-out is too
long
The arc is unstable,
resulting in welding
spatter.
The arc voltage is
too high
The arc is too long and the
fusion spatter increases.
The bead becomes
narrow The welding bead
becomes wider.
The gas protection
result is reduced,
resulting in gas pores. The arc is unstable.
The wire
stick-out is too
short
The nozzle is blocked,
resulting in gas pores.
The arc voltage is
too low
The arc is broken, the wire
wanders, and welding
spatter is generated.
It affects the line of
sight, making it difficult
to observe the
penetration. The welding bead
becomes narrow and the
electrode is not melted.
The thin base metal is
easily burned through. More excess weld metal
and weld flushes.
The welding
current is too
high
The welding spatter
increases.
The wire feeding
speed is too high
The welding bead
becomes narrow.
The depth of
penetration and
excess weld metal
increase and weld
formation is poor. The depth of penetration
and excess weld metal
decreases.
The base metal is
easy to burn through.
Wire extension: refers to the distance between the contact tip of welding torch and
workpiece to be welded