ESAB CIGWELD WeldSkill 205AC/DC, Operating Manual

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STICK (MMAW) Welding 6-16 0-5555
Description Possible Cause Remedy
6 Non-metallic particles are trapped in
the weld metal (slag inclusion)
A Non-metallic particles may
be trapped in undercut from
previous run
A If bad undercut is present,
clean slag out and cover
with a run from a smaller
diameter 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 corners
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
Not cleaned,
or incorrect
electrode
Slag
trapped in
undercut
Slag trapped in root
Art # A-05868_AC
Figure 6-33: Examples of Slag Inclusion
Table 6-3: Welding Problems