Parweld XTI-601 MP, Instruction Manual

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12
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.
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.
Description Possible Cause Remedy
Excessive
bead build
up or poor
penetration
or poor
fusion at
edges of
weld
Welding current is
too low
Increase weld
current and/
or faulty joint
preparation
Weld bead
too wide
and flat or
undercut
at edges
of weld or
excessive
burn through
Welding current is
too high
Decrease weld
current
Weld bead
too small or
insufficient
penetration
or ripples
in bead
are widely
spaced apart
Travel speed too
fast
Reduce travel
speed
Weld bead
too wide or
excessive
bead build up
or excessive
penetration
in butt joint
Travel speed too
slow
Increase travel
speed
Uneven leg
length in
fillet joint
Wrong placement
of filler rod
Re-position filler
rod
Electrode
melts when
arc is struck
Electrode is
connected to the
‘+’ terminal
Connect the
electrode to the
‘-‘ terminal
Faul
t
FI
n
DI
n
G