Trouble | Remedy |
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Wandering arc | Shield weld zone from drafts. |
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| Reduce gas flow rate. |
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| Select proper size and type of tungsten. Properly prepare tungsten according to Section 5. |
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| When using AC, check welding power source High Frequency control setting, and increase setting if nec- |
| essary. |
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Yellow powder or smoke on cup. | Use proper type shielding gas. |
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| Check for proper gas flow rate. Check manufacture’s recommendations. |
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| Increase postflow time. |
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| Check torch cup size. Match cup size to joint being welded. |
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Erratic arc | Make sure base material is clean and free of contaminates. |
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| When using DC, check polarity, and/or polarity of welding cables. |
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| Select proper size and type of tungsten. Properly prepare tungsten according to Section 5. |
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| Use proper arc length. Arc length may be too long or too short. |
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| When using AC, check welding power source High Frequency control setting, and be sure it is operating |
| continuously. |
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| When using AC, slow travel speed can cause erratic arc. Adjust travel speed. |
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Porosity in weld. | Check for proper type gas and correct flow rate. Check manufacture’s recommendations. |
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| Check and tighten gas fittings. |
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| Make sure base material and filler material is clean and free of contaminates. |
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| Check for impurities and moisture in gas lines. Purge if necessary. |
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| If torch is water cooled, check torch and cables for water leaks. Repair or replace if necessary (see Sec- |
| tion |
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