Tweco 300 DC Arcmaster - Manual (Page 51)

ARCMASTER 300 ACDC
February 22, 2006 10-1
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.
1 Excessive bead build-
up or poor
penetration or poor
fusion at edges of
weld.
2 Weld bead too wide
and flat or undercut at
edges of weld or
excessive burn
through.
3 Weld bead too small
or insufficient
penetration or ripples
in bead are widely
spaced apart.
4 Weld bead too wide or
excessive bead build
up or excessive
penetra­tion in butt
joint.
5 Uneven leg length in
fillet joint.
Description Possible Cause Remedy
Welding current is too low. Increase weld current and/or
faulty joint preparation.
Welding current is too high. Decrease weld current.
Travel speed too fast. Reduce travel speed.
Travel speed too slow. Increase travel speed.
Wrong placement of filler rod. Re-position filler rod.
Table 10-1: TIG Welding Problems