Which component of the TIG torch is typically associated with shielding gas flow and must be kept clean?

• A. Cup (nozzle) and collet
• B. Electrode tip
• C. Handle grip
• D. Ground clamp

Answer: (A)

Shielding gas needs a clean, unobstructed path from the gas inlet to the weld area. The cup (nozzle) is the part that directs that shielding gas around the tungsten electrode and the weld pool, forming the outlet at the tip. It works with the gas diffuser and the collet area to shape and deliver a stable blanket of gas. If the cup or the surrounding collet area is dirty or contaminated, gas flow can become restricted or turbulent, and contaminants can enter the gas stream, leading to porosity or oxidation in the weld. Keeping these parts clean ensures smooth, even gas flow and proper shielding of the weld.

The electrode tip, handle grip, and ground clamp don’t control the shielding gas flow, so they’re not the parts typically associated with gas delivery.