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TROUBLESHOOTING & REPAIR | ||||
TROUBLESHOOTING GUIDE |
| Observe Safety Guidelines | ||
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| detailed in the beginning of this manual. | ||
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| PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION |
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| TIG WELDING PROBLEMS |
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Black areas along weld bead. | 1. Clean any oily or organic conta- | 1. This may be a welding proce- | ||
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| mination from the work piece. | dure problem. |
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2.Tungsten electrode may be cont- Contact The Lincoln Electric Service aminated. Replace or sharpen. Department,
3.Check for contaminated gas or leaks in the gas line, torch, or associated connections.
4.The gas shielding may be insuffi- cient. Increase gas flow: reduce tungsten stickout beyond the gas cup.
Weak high frequency - machine has 1. | Check for loose or faulty connec- | 1. | Make sure that 115VAC is being |
normal welding. | tions at the torch and/or welding |
| applied to the primary of the high |
| cables. |
| voltage transformer (T3). See |
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| wiring diagram. |
2. The gas shielding may be insuffi- |
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| cient. Increase gas flow: reduce | 2. | Check for any open or arcing |
| tungsten stickout beyond the gas |
| high frequency component. |
| cup. |
| Replace as required. |
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| (Examples: C3, R3, C4) |
3. Check spark gap operation and |
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| setting. Normal is (0.015"). |
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| Refer to Maintenance section of | 3. | If spark is weak at the spark gap, |
| this manual. |
| check or replace the high fre- |
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| quency circuit. |
4. | The work and electrode cables |
| (Examples: T3, L3, L4). |
| may be in poor condition allowing |
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| the high frequency to "leak off". |
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| Use good quality cables with a |
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| high natural rubber content, such |
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| as Lincoln Stable Arc Cable. |
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| Cables should be as short as |
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| possible. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
