CIGWELD WELDSKILL 200HF Operating Manual page 50

200HF
Description
5 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).
6 Non-metallic particles are trapped in
the weld metal (slag inclusion)
OPERATION
OPERATING MANUAL
Possible Cause
A Welding current is too high.
B Welding arc is too long.
C Angle of the electrode is
incorrect.
D Joint preparation does not
allow correct electrode angle.
E Electrode too large for joint.
F Insufficient deposit time at
edge of weave.
Figure 6-31: Examples of undercut
A Non-metallic particles may
be trapped in undercut from
previous run
B Joint preparation too
restricted
C Irregular deposits allow slag
to be trapped
D Lack of penetration with slag
trapped beneath weld bead
E Rust or mill scale is
preventing full fusion
F Wrong electrode for position
in which welding is done
Slag
trapped in
undercut
Not cleaned,
or incorrect
electrode
Art # A-05868_AC
Figure 6-4: Examples of Slag Inclusion
Table 6-2: Welding Problems
A Reduce welding current
B Reduce the length of the
C Electrode should not be
D Allow more room in joint
E Use smaller gauge electrode.
F Pause for a moment at edge
Art # A-07714
A If bad undercut is present,
B Allow for adequate
C If very bad, chip or grind out
D Use smaller electrode with
E Clean joint before welding
F Use electrodes designed for
Slag trapped in root
6-12
Remedy
welding arc
inclined less than 45° to the
vertical face
for manipulation of the
electrode.
of weave to allow weld metal
build-up.
clean slag out and cover
with a run from a smaller
diameter electrode
penetration and room for
cleaning out the slag
irregularities
sufficient current to give
adequate penetration. Use
suitable tools to remove all
slag from corners
position in which welding
is done, otherwise proper
control of slag is difficult
Manual 0-5406