Model reference
WSE5 AC Square-Wave TIG Welder Reference
A WelderData model-family reference for thyristor AC square-wave TIG welders, focused on separating HF/gas faults from AC output and polarity-switching faults.
Database summary
WSE5-style AC square-wave TIG welders combine TIG torch/gas/HF control with an AC output stage that must alternate polarity for aluminum and magnesium welding. A repair complaint should be routed by mode: if DC behavior is normal but AC mode is unstable, the likely fault is in the AC switching, balance command, thyristor output control or polarity-related feedback path.
This page is a model reference; it does not replace a machine-specific service manual.
AC square-wave service questions
| Repair question | What it separates | Related action |
|---|---|---|
| Does DC TIG output work normally? | Base current loop vs AC switching fault | Use DC mode as a baseline before diagnosing AC polarity. |
| Does HF start behave normally? | HF control vs output control | If HF fails in all modes, route to HF/gas pages first. |
| Does AC balance affect arc behavior? | Balance command vs power output response | Check the setting path and polarity-switching drive. |
| Is output present but cleaning action poor? | Arc behavior vs electrical switching | Confirm polarity switching and actual current before adjusting technique settings. |