Thermal Arc ARCMASTER 185 AC/DC, Operating Manual

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ARCMASTER 185 AC/DC
10-4 Feb r ua r y 20, 2006
10.02 Stick Welding Problems
Description Possible Cause Remedy
1 Gas pockets o r
voids in weld metal
(Po
r osity).
A
B
C Elect r odes a r e damp.
Welding cu rr ent is too high.
Su r face impu r ities such as oil,
g r ease, paint, etc.
A
B
C D r y elect r odes befo r e use.
Reduce welding cu rr ent.
Clean joint befo r e welding.
2 C r ack occu rr ing in
weld metal soon
afte
r solidification
commences.
A
B
C
Rigidity of joint.
Insufficient th
r oat thickness.
Cooling
r ate is too high.
A
B
C
Redesign to r elieve weld joint of
seve r e st r esses o r use c r ack
r esistance elect r odes.
T r avel slightly slowe r to allow
g r eate r build up in th r oat.
P r eheat plate and cool slowly.
3 A gap is left by
failu r e of the weld
metal to fill the r oot
of the weld.
A
B
C
Welding cu rr ent is too low.
Elect r ode too la r ge fo r joint.
Insufficient gap.
A
B
C
Inc r ease welding cu rr ent
Use smalle r diamete r
elect r ode.
Allow wide r gap.
D Inco rr ect sequence. D Use co rr ect build-up sequence.
Table 10-2: Stick Welding P r oblems
Inco rr ect sequence
Insufficient
gap
A r t # A-04991
Figu r e 10-1: Example of Insufficient Gap o r Inco rr ect Sequence