Board reference · WSM-315 TIG
WSM-315 TIG control board reference
Use this page when a WSM-315 DC pulse TIG welder has torch-trigger response problems, gas without HF, HF without welding current, post-flow problems, protection light, foot-pedal control faults or current-control abnormalities. The control board should be treated as a signal router between panel, gas, HF, feedback and inverter drive.
Control-board role map
Torch / pedal inputStarts TIG sequence and may select panel or remote command.
Gas timingPre-flow and post-flow logic controls solenoid output.
HF commandEnables arc-start board only during the start window.
Current commandPanel knobs, foot pedal and pulse logic generate welding-current demand.
Feedback / protectionThermal, current feedback and abnormal states may block drive.
Drive enableMain inverter output is allowed only after safety and sequence conditions pass.
Connector and signal checklist
| Signal area | Function | Fault symptom |
|---|---|---|
| Torch switch / 2T-4T | Starts and holds the TIG sequence according to mode. | No response, wrong hold behavior, or output stops unexpectedly. |
| Gas valve output | Controls solenoid opening and post-flow timing. | No gas, gas always on, or post-flow too long/short. |
| HF start command | Sends timed command to HF arc-start board. | Gas works but no HF, or HF stays on after arc transfer. |
| Current command | Panel current, base current, peak current and remote pedal request. | Current not adjustable, stuck low/high current, pedal has no effect. |
| Pulse control | Pulse frequency/duty/peak-base logic for pulse TIG. | Pulse missing, unstable pulse or current cycling wrong. |
| Feedback input | Current transformer/shunt feedback and output condition return. | Weak output, false shutdown or poor current regulation. |
| Thermal/protection input | Stops output during over-temperature or abnormal conditions. | Protection lamp on, no output, intermittent shutdown. |
Do not treat gas, HF and current as one fault
Gas action proves only part of the start sequence. HF action proves only the arc-start path. Main welding current still depends on current command, feedback, protection state and inverter drive enable.