What is a typical sign of a gas leak around the TIG torch?

• A. Hissing sound around connections
• B. Bead porosity
• C. Torch glow
• D. Smell of gas around connections

Answer: (A)

Shielding gas is delivered under pressure to protect the weld, so a leak around the TIG torch typically shows up as a hissing or whistling sound from the connections. That audible sign means gas is escaping rather than properly enveloping the arc, which can lead to contamination and porosity in the weld. Other signs like bead porosity or torch glow reflect problems caused by improper shielding or excessive heat, not the leak itself. Also, many shielding gases (such as argon) are odorless, so smelling gas isn’t a reliable indication. If you hear a hiss, shut off gas, inspect and tighten connections, and check hoses and fittings for damage before continuing.