Weldclass Weldforce 202T Operating Instructions Manual page 44

Fault
Portions of the weld run do
not fuse to the surface of the
metal or edge of the joint.
Figure 40
Gas pockets or voids in weld
metal (porosity)
Figure 41
Crack occurring in weld metal
soon after
commences
Figure 42
Table 8
44
Cause
Small electrodes used on heavy
cold plate.
Welding current is too low.
Wrong electrode angle.
Travel speed of electrode is too
high.
Scale or dirt on joint surface.
High levels of Sulphur in steel.
Electrodes are damp.
Welding current is too high.
Surface impurities such as oil,
grease, paint, etc.
Welding
environment.
Electrode damaged i.e. flux
coating incomplete.
Rigidity of joint.
solidification
Insufficient throat thickness.
Weld current is too high.
© Weldclass 2020 | E.&O.E.
Remedy
Use larger electrodes and
preheat the plate.
Increase welding current.
Adjust angle so the welding arc
is directed more into the base
metal.
Reduce
electrode.
Clean surface before welding.
Use an electrode that is
designed for high Sulphur
steels.
Dry electrodes before use.
Reduce welding current.
Clean joint before welding.
in a windy Shield the weld area from the
wind.
Discard damaged electrodes
and only use electrodes with a
complete flux coating.
Redesign to relieve weld joint
of
resistance electrodes.
Travel slightly slower to allow
greater build up in throat.
Decrease welding current.
travel speed of
severe or use crack
.