TIG Torch Accessories FAQs
Practical answers on the handles, switches, cable covers, adaptors and gas fittings that go with a TIG torch.
Are gas fittings left-hand or right-hand thread?
It depends on the gas. Flammable gas connections, such as acetylene, hydrogen and propane, generally use left-hand threads, often with a notch in the nut. Non-flammable gases such as argon, nitrogen and air generally use right-hand threads. The difference is deliberate, so that the wrong connection cannot be made by accident.
There are exceptions, and torch fittings vary, so look at the markings. Never force a fitting that does not turn smoothly, because it can cross-thread and leak. Check the torch and regulator manuals.
How should I inspect my torch leads before use?
Make a quick visual check each time, with the machine switched off and unplugged. Look for cracked or cut insulation, exposed copper, kinks, loose or overheated connectors, scorch marks and a damaged handle or switch.
Do not use a damaged lead. UK HSE guidance says welders should check the insulation on welding leads and connectors daily, and that damaged cable should be replaced by a competent person rather than patched with tape. Follow the maker's instructions and your own risk assessment.
What is a power cable adaptor and when might I need one?
A power cable adaptor joins a torch's power lead to a machine socket that has a different connection style or thread. It is useful when you fit a torch to a different machine or replace a damaged connector.
It must suit the connector on both sides and carry the current of your torch. Tighten connectors firmly as the maker's instructions say, because a loose connector can overheat and give poor contact. After welding, check that the joint has not run hot, and follow the maker's current rating.
Which is better, a torch switch or a foot pedal?
A torch switch is basically an on/off control: you get whatever current you set on the machine. It suits tacking and simple work, and 2T and 4T modes with slopes add some current ramping. A foot pedal gives the best control of heat, which is why many welders prefer it for thin material and fine work.
A fingertip or thumb control on the torch can vary current like a pedal, which suits position work. Many welders use both, and you should check that your machine accepts the remote you want.