Tweco 300 S Arcmaster - Manual (Page 39)

ARCMASTER ® 300 S
March 31, 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.
Description Possible Cause Remedy
1. Excessive beard 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 fl at or
undercut at edges of weld or
excessive burn through Welding current is too high Decrease weld current
3. Weld bead too small or insuffi cient
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 fi llet joint Wrong placement of fi ller rod Re-position fi ller 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 fi ller rod
material.
A. Clean the electrode by grinding off
the contaminates.
B. Gas contaminated with air. B. Check gas lines for cuts and loose
fi tting or change gas cylinder.