HF control socket
Command from control panel.
HF board reference
WSM-315 HF Arc Start Board Reference
A redrawn board-level reference for WSM-315 TIG high-frequency arc-start diagnosis.
Quick Answer
The HF board is a start-path board. It should create high-frequency start energy and then stop after arc transfer.
- No HF: check control command, HF relay, HV pack and output socket.
- HF stuck on: check relay/contact or control output stuck ON.
- HF but no arc transfer: check main output, work return, torch and consumables.
HF board role
The HF arc-start board is a start-path board, not the whole welding output system. It controls the high-voltage/high-frequency start path, boost output and relay switching that should stop after arc transfer.
HF arc-start board
WSM-315 HF arc-start board
The HF board is a start-path board. It should help ignition and stop after arc transfer.
HF relay
Switches HV start path.
Boost / HV pack
Raises arc-start voltage.
Discharge resistor
Bleeds HV after start.
Arc-start output
HF lead to torch or output terminal.
No HF at torch
Check command, relay, HV pack and HF output socket.
HF stuck on
Relay contact or control output may remain ON.
Hard start / no transfer
Check boost output, work return and main output path.
HF fault table
| Symptom | Likely layer | Check direction |
|---|---|---|
| No HF at torch | HF control command, relay, HV pack, output socket | verify command before replacing HV parts. |
| HF stays on | HF relay/SSR/control output stuck | confirm arc-transfer cutoff path. |
| HF exists but arc does not transfer | main output, work clamp, torch, output polarity | do not stay only on HF board. |
| Hard TIG start | spark gap, boost output, ground return, torch consumables | compare HF and main-current behavior. |