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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 |
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| POSSIBLE AREAS OF |
| RECOMMENDED |
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(SYMPTOMS) |
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| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| TIG WELDING PROBLEMS |
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When AC TIG welding, the arc is 1. | The tungsten electrode may be | 1. | Check components R3 and C4 in | |||
erratic and there is a loss of "clean- | too small for the process. Use a |
| the high voltage transformer pri- | |||
ing" of the work piece. |
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| larger diameter tungsten or a |
| mary circuit. |
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| pure tungsten. |
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| 2. | If a helium blend is used as a | 2. | Perform the SCR Bridge Test. | ||
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| shielding gas, then reduce the |
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| percentage of helium. |
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The end of the tungsten electrode | 1. The welding current is too high | 1. This may be a welding procedure |
melts away. | for the electrode type and or | problem. |
| size. See Table B.1 in the |
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| Operation Section. | Contact The Lincoln Electric Service |
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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
