Parweld XTI-303 AC/DC, Инструкция по эксплуатации

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11
Description Possible cause Remedy
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
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.
Faul
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