Repair workflow
TIG AC/DC Model-Series Fault Reference
A WelderData diagnostic workflow for routing TIG faults by model family: pulse TIG, thyristor AC square-wave TIG and compact MOSFET AC/DC inverter TIG.
Database summary
TIG model-series diagnosis should not begin with the power devices alone. WSM-style pulse TIG, WSE-style AC square-wave TIG and WIG-style compact AC/DC inverter TIG machines use different control layers. The same symptom, such as unstable current or no arc transfer, can come from different board sections depending on the model family and operating mode.
Model-series routing map
Fault routing table
| Model family | If this works | But this fails | Route first to |
|---|---|---|---|
| WSM pulse TIG | Normal DC TIG current | Pulse mode has no effect | Pulse command, parameter board and current-loop interface |
| WSE AC square-wave TIG | HF/gas and DC output | AC output or cleaning action abnormal | AC polarity switching and thyristor output control |
| WIG AC/DC inverter TIG | Stick or DC TIG output | AC TIG unstable or shutdown | AC/DC selection, compact inverter output and protection rails |
| Any TIG family | Gas and HF abnormal in all modes | No stable arc start | Torch switch, gas-delay circuit and HF start logic |