Thermal Arc PRO-WAVE 300 TSW, Service Manual

Page: 51 / 110

PRO-WAVE 300TSW
August 10, 2005
6-5
Description Possible Cause Remedy
4. Portions of the weld
bead do not fuse to A. Small electrodes used on
heavy cold plate.
A. Use larger electrodes and
preheat the plate.
B. Welding current is too low. B. Increase the 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 of dirt on joint surface. E. Clean surface before welding.
Art # A-05568
Figure 6-2: Example of lack of fusion.
Description Possible Cause Remedy
5. A. Non-metallic particles may
be trapped in undercut from
A. If bad undercut is present, clean
slag out and cover with a run
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.
Non-metallic
particles are trapped
in the weld metal
(Slag inclusion).
Art # A-05569
Figure 6-3: Example of slag inclusion.