OPERATING MANUAL
Transmig 255i
Transmig 255i
MANUAL ARC (MMAW) WELDING
7-14
Manual 0-5550
7.04 Stick (MMAW) Welding Troubleshooting
FAULT
CAUSE
REMEDY
1 Welding current
varying
ARC FORCE control knob
is set at a value that
causes the welding current
to vary excessively with
the arc length.
Reduce the ARC FORCE control knob until
welding current is reasonably constant while
prohibiting the electrode from sticking to the
work piece when you “dig” the electrode into the
workpiece.
2 A gap is left by
failure of the weld
metal to fill the
root of the weld.
A Welding current too low
A Increase welding current.
B Electrode too large for
joint.
B Use smaller diameter electrode.
C Insufficient gap.
C Allow wider gap.
3 Non-metallic
particles are
trapped in the
weld metal.
A Non-metallic particles may
be trapped in undercut
from previous run.
A If a bad undercut is present clean slag bout and
cover with a run from a smaller gauge electrode.
B Joint preparation too
restricted.
B Allow for adequate penetration and room for
cleaning out the slag.
C Irregular deposits allow
slag to be trapped.
C If very bad, chip or grind out irregularities.
D Lack of penetration with
slag trapped beneath weld
bead.
D Use smaller electrode with sufficient current to
give adequate penetration. Use suitable tools to
remove all slag from comers.
E Rust or mill scale is
preventing full fusion.
E Clean joint before welding.
F Wrong electrode for
position in which welding
is done.
F Use electrodes designed for position in which
welding is done, otherwise proper control of slag
is difficult.
Insufficient Gap
Incorrect Sequence
Art # A-05866_AC
Figure 1-Example of insufficient gap or incorrect sequence
4 A groove has been
formed in the base
metal adjacent to
the toe of a weld
and has not been
filled by the weld
metal (undercut).
A Welding current is too
high.
A Reduce welding current.
B Welding arc is too long.
B Reduce the length of the welding arc.
C Angle of the electrode is
incorrect.
C Electrode should not be inclined less than 45° to
the vertical face.
D Joint preparation does not
allow correct electrode
angle.
D Allow more room in joint for manipulation of the
electrode.
E Electrode too large for
joint.
E Use smaller gauge electrode.
F Insufficient deposit time at
edge of weave.
F Pause for a moment at edge of weave to allow
weld metal buildup.
G Power source is set for
MIG (GMAW) welding.
G Set power source to STICK (MMAW) mode.