Lincoln Electric Square Wave TIG 200 Operator's Manual page 21

SQUARE WAVE® TIG 200
PROBLEM
Arc "Flutters" when TIG
welding.
Arc "Pulsates" when TIG
welding
Black areas along weld bead. 1. Clean any oily or organic contamination from the work piece.
Weak high frequency -
machine has normal welding
output.
High frequency "spark" is
present at tungsten electrode,
but operator is unable to
establish a welding arc.
Machine has normal open
circuit voltage (refer to
Technical Specifications in
the Installation Chapter).
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE CAUSE
1. Tungsten electrode may be too large in diameter for the current
setting.
2. Tungsten not prepared properly - should have slight blunt.
3. Gas shielding may be insufficient. Increase gas flow; reduce
tungsten stickout beyond gas cup.
4. Check for contaminated gas or leaks in the gas line, torch, or
connections
5. If a helium blend is used as a shielding gas, then reduce the
percentage of helium.
1. Check to see if the Pulse feature is active.
2. Tungsten electrode may be contaminated. Replace or sharpen.
3. Check for contaminated gas or leaks in the gas line, torch, or
connections
4. Gas shielding may be insufficient. Increase gas flow; reduce
tungsten stickout beyond gas cup.
1. Check for poor connections in the welding circuit.
2. Gas shielding may be insufficient. Increase gas flow; reduce
tungsten stickout beyond gas cup.
3. Check for work and torch cables in poor condition allowing high
frequency to "Leak Off".
4. Keep cables as short as possible.
1. The tungsten electrode may be contaminated. Replace or sharpen.
2. The current control may be set too low.
3. The tungsten electrode may be too large for the process.
4. If a helium blend is used as a shielding gas, then reduce the
percentage of helium.
5. Tungsten is too far from the workpiece when starting.
CAUTION
E-3
TROUBLE SHOOTING
RECOMMENDED
COURSE OF ACTION
Contact your Local Lincoln
Authorized Field Service
Facility for technical
troubleshooting assistance.