www.parweld.com
Description
Possible cause
Remedy
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 arc is
directed more
into the base
metal
(d) Reduce
travel speed
of electrode
(e) Clean
surface before
welding.
Description
Possible cause
Remedy
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.
adequate
penetration.
Use suitable
tools to
remove all
slag from
corners
(f) Use
electrodes
designed for
position in
which welding
is done,
otherwise
proper control
of slag is
difficult.
TIG welding problems
Weld quality is dependent on the selection of the
correct consumables, maintenance of equipment and
proper welding technique.
10
Faul
t
FI
n
DI
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