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| TROUBLESHOOTING |
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| TROUBLESHOOTING GUIDE |
| Observe Safety Guidelines | ||
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| detailed throughout this manual. | |
| TIG WELDING (Continued) | ||||
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| SYMPTOM |
| CAUSE AND REMEDY | ||
| Tungsten is eroding quickly. | 1. Current potentiometer is set too high for tungsten size. | |||
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| Reduce welding current or increase tungsten size. | |
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| 2. | In AC, Wave Balance control may be set too far towards | |
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| CLEANING. Turn Balance pot towards PENETRATION, or | |
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| increase tungsten size. | |
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| Tungsten seems to “spit” when Arc Start Switch |
| High welding current is thermally “shocking” the cold | ||
| or Amptrol is pressed at high currents. |
| tungsten causing pieces of the end to spall off. Turn Start | ||
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| Switch ON, and set Start Current to a value lower than the | |
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| welding current to give a “soft” start. | |
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| LOWER PANEL CONTROLS | ||||
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| SYMPTOM |
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| CAUSE AND REMEDY | |
| Machine does not always wait for Preflow time |
| Machine is operating correctly; it does not go through a | ||
| when starting arc. |
| Preflow period if the Arc Start Switch or Amptrol is pressed | ||
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| during the Afterflow period. | ||
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| The Spot Time does not last as long as the |
| When in the | ||
| nameplate setting. |
| Amptrol pressed until the Spot Time is completed. Releasing the | ||
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| Arc Start Switch before the Spot Timer has timed out will cause | ||
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| the arc to go out. | ||
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| The Spot Time lasts much longer than the |
| The Crater Fill switch should be turned OFF. If it is left ON, | ||
| nameplate setting. |
| the actual weld time will be the spot time plus the crater fill time. | ||
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| The Start Current seems very hot. |
| The Start Current dial is labeled MIN to MAX of the welder | ||
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| output or, 2 to 400 amps. Always be sure to use the Start Read | ||
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| pushbutton to check the Start Current preset reading on the digital | ||
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| ammeter before welding. | ||
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| The Pulser does not seem to operate. |
| 1. If Start Controls are used, pulsing does not begin until the | ||
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| end of the start time, which can be as much as 10 seconds. | |
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| 2. | Check the Pulses Per Second control. If it is set near mini- | |
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| mum, each pulse may be as long as ten seconds. Set all | |
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| three of the pulse controls near the midpoints to see the | |
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| Pulser’s effects. | |
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| 3. | The Pulse % On control may be set at either extreme. If that | |
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| is the case, the pulses may be too short to be seen, depend- | |
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| ing on the settings of the Current and Background % Current | |
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| controls. Set all three of the pulse controls near the mid- | |
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| points to see the Pulser’s effects. | |
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| When using Crater Fill, the arc goes out |
| 1. The Crater Fill % Current control may be set too low for the | ||
| before the final Crater Fill Current level |
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| tungsten being used. Increase the Crater Fill % Current con- | |
| is reached. |
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| trol until the final Crater Fill current is within the tungsten’s | |
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| operating range. | |
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| 2. | If using the Pulser in conjunction with the Crater Fill, the | |
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| Background % Current may be too low for the tungsten as | |
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| the current is downsloping in Crater Fill. The best solution is | |
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| to increase the Background % Current level. | |
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| 3. | If welding with AC use CONTINUOUS High Frequency. The | |
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| high frequency will stabilize the arc as the current goes | |
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| down. | |
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SQUARE WAVE TIG 355
