What is the proper shutdown procedure for a TIG welding power source?

• A. Close gas cylinder, turn off power, release regulator pressure
• B. Turn off power, close gas cylinder, release regulator pressure
• C. Close gas cylinder only
• D. Release regulator pressure only

Answer: (A)

Safe shutdown of a TIG welding power source focuses on securing the shielding gas, cutting electrical power, and relieving any remaining pressure in the gas line and regulator. First, close the gas cylinder valve to stop any further gas flow into the system, preventing leaks and unwanted gas buildup in the workspace. Next, turn off the welding power source to eliminate the live electrical hazard and avoid any accidental arc or heat exposure. Finally, release the regulator pressure to vent the remaining gas in the regulator and lines, so no stored pressure could cause issues on the next setup and the equipment is ready for safe storage or transport. If gas flow remains on, or the power stays on, there’s a higher risk of leaks, equipment damage, and safety hazards. This sequence combines gas safety with electrical safety and proper depressurization, making it the best practice for shutting down a TIG power source.