Tweco 185TSW DC CC - Manual (Page 43)

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10.0 BASIC TROUBLESHOOTING
WARNING 9
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 penetra-
tion 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.