Model family
TIG / AC-DC TIG Welders
A WelderData model-family hub for DC TIG, AC square-wave TIG and pulse TIG control systems, focused on service routing rather than welding technique.
Database summary
TIG / AC-DC TIG welders combine a controlled welding power source with torch-switch logic, shielding-gas timing, high-frequency start, current feedback and, on AC/DC machines, polarity switching. WelderData separates these systems so a no-start or unstable-arc complaint can be routed to the correct board section before replacing power devices or HF parts.
This model-family page connects DC TIG, AC square-wave TIG, pulse TIG and common service checks. It is a hub, not a single-machine service manual.
Main TIG control areas
| Area | Repair question | Related page |
|---|---|---|
| HF start | Is high frequency enabled only before arc transfer, and does it stop after ignition or timeout? | HF start 40V / 4s cutoff |
| Torch / gas timing | Does the torch switch command gas pre-flow, output enable and post-flow correctly? | Torch switch and gas delay |
| Auxiliary rails | Are 24V, 20V and 15V rails present before blaming PWM or HF control? | TIG auxiliary rails |
| AC square wave | Does AC mode fail while DC mode still behaves normally? | AC square-wave TIG control |
| Pulse TIG | Are peak, base, frequency and duty commands reaching the current loop? | Pulse TIG current control |
How WelderData routes TIG faults
A TIG fault should be routed by symptom and by operating mode. If DC TIG output is normal but AC TIG is abnormal, focus on polarity switching, AC balance command or AC output drive. If welding current exists but HF behavior is abnormal, keep the HF board separate from the main output current loop. If gas timing is wrong, do not start from the IGBT stage; start from torch switch input, delay timing and solenoid drive.
For pulse TIG, verify whether the machine can produce stable non-pulsed output first. A pulsed-current fault can come from the setting board, pulse generator, feedback signal, display/control interface or main current loop.