Tweco 400 TS Arcmaster - Manual (Page 46)

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10.0 BASIC TROUBLESHOOTING
WARNING 8
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.
Electrode is connected to the ‘+’
terminal.
Connect the electrode to the ‘
−’
terminal.
7 Dirty weld pool. A Electrode contaminated through
contact with work piece or filler
rod material.
A Clean the electrode by grinding
off the contaminates.
B Gas contaminated with air. B Check gas lines for cuts
and loose fitting or change
gas cylinder.