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Description
Non-metallic particles
are trapped in the weld
metal (slag inclusion).
TIG welding problems
Weld quality is dependent on the selection of the correct
consumables, maintenance of equipment and proper welding
technique.
Description
Excessive bead
build up or poor
penetration or
poor fusion at
edges of weld
10
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Possible cause
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.
possible Cause
Remedy
Welding current is too
Increase weld
low
current and/or faulty
joint preparation
Remedy
Description
a) If bad
Weld bead too
undercut
wide and flat
is present,
or undercut at
clean slag
edges of weld
out and
or excessive
cover with
burn through
a run from
Weld bead
a smaller
too small or
diameter
insufficient
electrode.
penetration or
(b) Allow for
ripples in bead
adequate
are widely
penetration
spaced apart
and room for
Weld bead
cleaning out
too wide or
the slag
excessive
(c) If very
bead build up
bad, chip
or excessive
or grind out
penetration in
Irregularities
butt joint
(d) Use
Uneven leg
smaller
length in fillet
electrode
joint
with sufficient
Electrode melts
current
when arc is
to give
struck
adequate
penetration.
Dirty weld pool
adequate
penetration.
Use suitable
tools to
remove all
slag from
corners
Electrode melts
(f) Use
or oxidizes
electrodes
when an arc is
designed
struck
for position
in which
welding
is done,
otherwise
proper
control
of slag is
difficult.
Poor weld finish Inadequate shielding
Arc flutters
during TIG
welding
possible Cause
Remedy
Welding current is too
Decrease weld
high
current
Travel speed too fast
Reduce travel speed
Travel speed too slow
Increase travel
speed
Wrong placement of
Re-position filler rod
filler rod
Electrode is connected
Connect the
to the '+' terminal
electrode to the '-'
terminal
(a) Electrode
(a) Clean the elec-
contaminated through
trode by grinding off
contact with work piece
the contaminates
or filler rod material
(b) Check gas lines
(b) Gas contaminated
for cuts and loose
with air
fitting or change gas
cylinder
(a) No gas flowing to
(a) Check the gas
welding region
lines for kinks or
breaks and gas
(b) Torch is clogged with
cylinder contents
dust
(b) Clean torch
(c) Gas hose is cut
(c) Replace gas
(d) Gas passage
hose
contains impurities
(d) Disconnect gas
(e) Gas regulator is
hose from torch
turned off
then raise gas
(f) Torch valve is turned
pressure to blow
off
out impurities.
(g) The electrode is too
(e) Turn on
small for the welding
(f) Turn on
current
(g) Increase
electrode diameter
or reduce the
welding current
Increase gas flow or
gas
check gas line for
gas flow problems
(a) Tungsten electrode is
(a) Select the right
too large for the welding
size electrode. Refer
current
to basic TIG welding
guide.
(b) Absence of oxides in
the Weld pool.
(b) Refer basic TIG
welding guide for
ways to reduce arc
flutter
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