Parweld XTI 161DV - Fault Finding

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9
Guide for selecng ller 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 ller wire diameter specied is a guide only, other
diameter wires may be used according to the welding
applicaon
Shielding gas selecon
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
Descripon Possible cause Remedy
Gas pockets or
voids in weld
metal (porosity)
(a) Electrodes are
damp
(b) Welding current
is too high.
(c) Surface
impuries such as
oil, grease, paint,
etc
(a) Dry
electrodes
before use
(b) Reduce
welding
current
(c) Clean
joint before
welding
Descripon Possible cause Remedy
Crack occurring in
weld metal soon
aer solidica-
on.
(a) Rigidity of joint.
(b) Insucient
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 le by
failure of the weld
metal to ll the
root of the weld
(a) Welding current
is too low.
(b) Electrode too
large for joint.
(c) Insucient gap
(d) Incorrect
sequence
(a) Increase
welding
current
(b) Use
smaller
diameter
electrode.
(c) Allow
wider gap
(d) Use
correct build-
up sequence
Fault
FInDInG