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Description
6 Non-metallic particles are trapped in
the weld metal (slag inclusion)
Not cleaned,
or incorrect
electrode
STICK (MMAW) Welding
Possible Cause
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
Slag trapped in root
Art # A-05868_AC
Figure 6-33: Examples of Slag Inclusion
Table 6-3: Welding Problems
6-16
Remedy
A If bad undercut is present,
clean slag out and cover
with a run from a smaller
diameter electrode
B Allow for adequate
penetration and room for
cleaning out the slag
C If very bad, chip or grind
out irregularities
D Use smaller electrode with
sufficient current to give
adequate penetration. Use
suitable tools to remove all
slag from corners
E Clean joint before welding
F Use electrodes designed for
position in which welding
is done, otherwise proper
control of slag is difficult
0-5555
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