Tweco 300 ACDC Arcmaster - Manual (Page 47)

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SECTION 10. BASIC TROUBLESHOOTING
WARNING
There are extremely dangerous voltages and power levels present inside this product. Do not attempt to
open or repair unless you are an Accredited Thermal Arc Service Agent and you have had training in
power measurements and troubleshooting techniques.
If major complex subassemblies are faulty, then the Welding Power Source must be returned to an accredited
Thermal Arc Service Agent for repair.
The basic level of troubleshooting is that which can be performed without special equipment or knowledge.
10.01 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
1 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.
2 Weld bead too wide
and flat or undercut at
edges of weld or
excessive burn through.
Welding current is too high. Decrease weld current.
3 Weld bead too small or
insufficient penetration
or ripples in bead are
widely spaced apart.
Travel speed too fast. Reduce travel speed.
4 Weld bead too wide or
excessive bead build up
or excessive penetration
in butt joint.
Travel speed too slow. Increase travel speed.
5 Uneven leg length in
fillet joint.
Wrong placement of filler rod. Re-position filler rod.
6 Electrode melts when
arc is struck.
A Electrode is connected to the ‘+’
terminal.
A Connect the electrode to the
‘
−’ terminal.
B WAVE BALANCE is greater
than 50%.
B Reduced WAVE BALANCE to
below 50% or increase the
electrode size.
Table 10-1. TIG Welding Problems