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Description
12 Arc start is not
smooth.
9.02 Stick Welding Problems
Description
1 Gas pockets or
voids in weld metal
(Porosity).
2 Crack occurring in
weld metal soon
after solidification
commences
3 A gap is left by
failure of the weld
metal to fill the
root of the weld.
Possible Cause
A Tungsten electrode is too
large for the welding current.
B The wrong electrode is being
used for the welding job
C Gas flow rate is too high.
D Incorrect shielding gas is
being used.
E Poor work clamp connection
to work piece.
Possible Cause
A
Electrodes are damp.
B
Welding current is too high.
C
Surface impurities such as
oil, grease, paint, etc.
A
Rigidity of joint.
B
Insufficient throat thickness.
C
Cooling rate is too high.
A
Welding current is too low.
B
Electrode too large for joint.
C
Insufficient gap.
D Incorrect sequence.
Figure 8 – Example of insufficient gap or incorrect
sequence
42
Remedy
A Select the right size electrode.
Refer to Basic TIG Welding
Guide.
B Select the right electrode
type. Refer to Basic TIG
Welding Guide
C Select the correct rate for the
welding job.
Refer to Basic TIG Welding
Guide.
D Select the right shielding gas.
Refer to Basic TIG Welding
Guide.
E Improve connection to work
piece.
Remedy
A
Dry electrodes before use.
B
Reduce welding current.
C
Clean joint before welding.
A
Redesign to relieve weld joint
of severe stresses or use crack
resistance electrodes.
B
Travel slightly slower to allow
greater build up in throat.
C
Preheat plate and cool slowly.
A
Increase welding current
B
Use smaller diameter
electrode.
C
Allow wider gap.
D Use correct build-up sequence.
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