Tweco 300 TS Arcmaster(Feb2006) - Manual (Page 45)

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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.