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TROUBLESHOOTING & REPAIR | ||||||
TROUBLESHOOTING GUIDE |
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| 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 MODE PROBLEMS |
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The arc "flutters" when TIG welding. 1. | The tungsten electrode may be | 1. | Check the polarity switch for |
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| too large in diameter for the cur- |
| proper operation and loose or |
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| rent setting. |
| faulty lead connections. See |
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| wiring diagram. |
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| 2. The tungsten tip may not be |
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| "sharp" enough. | 2. | Perform the SCR Bridge Test. | |
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| 3. Check for loose or faulty connec- | ||
| 3. | The gas shielding may be insuffi- |
| tions at the shunt. ( leads #221 | ||
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| cient. Increase the gas flow and |
| and #222 ). |
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| or reduce the tungsten stickout |
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| beyond the gas cup. | 4. | Check components R3 and C4 in | |
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| the high voltage transformer pri- | |
| 4. | Check for contaminated gas or |
| mary circuit. Replace if neces- | ||
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| leaks in the gas line, torch, or |
| sary. See wiring diagram. |
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| connections. |
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| 5. The control board may be faulty. | ||
| 5. | If a helium blend is used as a |
| Replace. |
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| shielding gas then reduce the |
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| percentage of helium. |
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The arc "pulsates" when AC TIG | 1. Make sure the gas and proce- | 1. Check the micro switch S2A on |
welding. | dure are correct for the process | the polarity switch. It may be |
| being used. | stuck closed. See wiring dia- |
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| gram. |
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