CIGWELD WELDSKILL 200HF, Operating Manual

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OPERATING MANUAL
200HF
OPERATING MANUAL
200HF
Manual 0-5406 6-11 OPERATION
6.20 Welding Problems
Description Possible Cause Remedy
1 Gas pockets or voids in weld metal
(Porosity)
A Electrodes are damp A Dry electrodes before use
B Welding current is too high B Reduce welding current
C Surface impurities such as
oil, grease, paint, etc
C Clean joint before welding
2 Crack occurring in weld metal soon
after solidification commences
A Rigidity of joint A Redesign to relieve weld joint
of severe stresses or use
crack resistance electrodes
B Insufficient throat thickness B Travel slightly slower to alloy
greater build-up in throat
C Cooling rate is too high C Preheat plate and cool slowly
3 A gap is left by failure of the weld
metal to fill the root of the weld
A Welding current is too low A Increase welding current
B Electrode too large for joint B Use smaller diameter
electrode
C Insufficient gap C Allow wider gap
D Incorrect sequence D Use correct build-up
sequence
Insufficient Gap
Incorrect Sequence
Art # A-05866_AC
Figure 6-29: Example of Insufficient Gap or Incorrect Sequence
4 Portions of the weld run do not fuse
to the surface of the metal or edge of
the joint
A Small electrodes used on
heavy cold plate
A Use larger electrodes and
preheat the plate
B Welding current is too low B Increase welding current
C Wrong electrode angle C Adjust angle so the welding
arc is directed more into the
base metal
D Travel speed of electrode is
too high
D Reduce travel speed of
electrode
E Scale or dirt on joint surface E Clean surface before welding
Art # A-05867_AC
Lack of
inter-run fusion
Lack of side fusion,
scale dirt, small electrode,
amperage too low
Lack of root fusion
Lack of fusion caused by dirt,
electrode angle incorrect,
rate of travel too high
Figure 6-30: Example of Lack of Fusion