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DYNA TIG 201AC/DC Operating Manual
3 A gap is left by
failure of the weld
metal to fill the root
of the weld.
A Welding current is too low.
B Electrode too large for joint.
C Insufficient
gap.
D Incorrect
sequence.
A Increase welding current.
B Use smaller diameter electrode.
C Allow
wider
gap.
D Use correct build-up 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.
B Welding current is too low.
C Wrong electrode angle.
D Travel speed of electrode is too high.
E Scale or dirt on joint surface.
A Use larger electrodes and preheat
the plate.
B Increase welding current.
C Adjust angle so the welding is
directed more into the base metal.
D Reduce travel speed of electrode.
E Clean surface before welding.
5 Non-metallic
particles are trapped
in the weld metal
(slag inclusion).
A Non-metallic particles may be trapped
in undercut from previous run.
B Joint preparation too restricted.
C Irregular deposits allow slag to be
trapped.
D Lack of penetration with slag trapped
beneath weld bead.
E Rust or mill scale is preventing full
fusion.
F Wrong electrode for position in which
welding is done.
A If bad undercut is present, clean slag
out and cover with a run from a
smaller diameter electrode.
B Allow for adequate penetration and
room for cleaning out the slag.
C If very bad, chip or grind out
irregularities.
D Use smaller electrode with sufficient
current to give adequate penetration.
Use suitable tools to remove all slag
from corners.
E Clean joint before welding.
F Use electrodes designed for position
in which welding is done, otherwise
proper control of slag is difficult.
Table 21
9.05 Power source problems
Description Possible
Cause
Remedy
1 The welding arc can not be
established.
A The Primary supply voltage has not
been switched on.
B The welding power source switch is
switched off.
C Loose connections internally.
A Switch on the primary
supply voltage.
B Switch on the welding
power source.
C Have an accredited FCW
service agent repair the
connection.
2 Maximum output welding
current can not be achieved
with nominal Mains supply
voltage.
Defective control circuit.
Have an accredited FCW
service agent inspect then
repair the welder.
