Specifications

Transtig 200Pi, 250Pi, 300Pi
38
Description Possible Cause Remedy
3 A gap is left by failure
of the weld metal to fill
the root of the weld.
A
B
C
Welding current is too low.
Electrode too large for joint.
Insufficient gap.
A
B
C
Increase welding current
Use smaller diameter
electrode.
Allow wider gap.
D Incorrect sequence. D Use correct build-up sequence.
Figure 21 – 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
B
Small electrodes used on heavy
cold plate.
Welding current is too low.
A
B
Use larger electrodes and pre-heat
the plate.
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.
Figure 22 – Example of lack of fusion
5
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.
Figure 23 – Examples of slag inclusion