Parweld XTI-601 MP, Instruction Manual

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FI
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Tungsten electrode types
Electrode
type
Welding application
Colour
code
Thoriated
2%
DC welding of mild steel,
stainless steel and copper.
Excellent arc starting, long
life, high current carrying
capacity.
RED
Ceriated
2%
DC welding of mild steel,
stainless steel, copper,
aluminium, their alloys
longer life, more stable
arc, easier starting, wider
current range, narrower
more concentrated arc
GREY
Guide for selecting filler wire diameter
Filler wire
diameter
DC current range
1/16” (1.6
mm)
20 - 90
3/32” (2.4
mm)
65 - 115
1/8” (3.2
mm)
100 - 165
3/16” (4.8
mm)
200-350
The filler wire diameter specified is a guide only, other
diameter wires may be used according to the welding
application
Shielding gas selection
Alloy Shielding gas
Aluminium &
alloys
Pure Argon
Carbon steel Pure Argon
Stainless steel Pure Argon
Nickel alloy Pure Argon
Copper Pure Argon
Titanium Pure Argon
7.0 Fault Finding
MMA welding problem
Description Possible cause Remedy
Gas pockets
or voids in
weld metal
(porosity)
(a) Electrodes
are damp
(b) Welding
current is too
high.
(c) Surface
impurities such
as oil, grease,
paint, etc
(a) Dry electrodes
before use
(b) Reduce
welding current
(c) Clean joint
before welding
Crack occur-
ring in weld
metal soon
after solidifi-
cation.
(a) Rigidity of
joint.
(b) Insufficient
throat thickness.
(c) Cooling rate is
too high.
(a) Redesign
to relieve weld
joint of severe
stresses or use
crack resistance
electrodes.
(b) Travel slightly
slower to allow
greater build up
in throat.
(c) Preheat plate
and cool slowly.
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
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