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 do I find a gas leak at a fitting?
Open the cylinder valve and check the joints between the regulator, hose and machine with no arc struck. To check the torch end, use the machine's gas purge if it has one, with welding current off. Brush a leak-detection fluid made for gas equipment onto each fitting and hose joint and watch for bubbles, which show a leak. Never look for leaks with a flame.
Tighten the fitting or replace a worn hose rather than carrying on, because a leak can upset the shielding gas and spoil the weld. Follow the gas supplier's and the maker's guidance on which fluid to use, especially on oxygen equipment.
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.