Parweld XTI 161DV - Page 11

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Descripon Possible cause Remedy
Porons 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 arc is
directed more
into the base
metal
(d) Reduce
travel speed
of electrode
(e) Clean
surface before
welding.
Descripon Possible cause Remedy
Non-metallic
parcles are
trapped in the
weld metal (slag
inclusion).
(a) Non-metallic
parcles may
be trapped in
undercut from
previous run
(b) Joint
preparaon too
restricted
(c) Irregular
deposits allow slag
to be trapped.
(d) Lack of
penetraon with
slag trapped
beneath weld bead.
(e) Rust or mill
scale is prevenng
full fusion.
(f) Wrong electrode
for posion 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
penetraon
and room for
cleaning out
the slag
(c) If very
bad, chip or
grind out
Irregularies
(d) Use
smaller
electrode
with sucient
current to
give adequate
penetraon.
adequate
penetraon.
Use suitable
tools to
remove all
slag from
corners
(f) Use
electrodes
designed for
posion in
which welding
is done,
otherwise
proper control
of slag is
dicult.
TIG welding problems
Weld quality is dependent on the selecon of the
correct consumables, maintenance of equipment and
proper welding technique.
10
Fault
FInDInG