What two physical dimensions define the nozzle size?

• A. Cone angle and length
• B. Diameter of opening and its length
• C. Material and color
• D. Gas type and flow rate

Answer: (B)

Two physical measurements define the nozzle size: the diameter of the opening and the length of the nozzle. The opening diameter determines how wide the shielding gas exits, shaping the coverage area around the weld. The length of the nozzle affects how far the gas travels before it exits and how concentrated or diffuse the shielding becomes at the weld pool. Together, these dimensions specify the nozzle’s physical size and how it delivers shielding gas.

Materials or colors don’t set the size, and gas type or flow rate influences shielding performance but not the nozzle’s physical dimensions. Cone angle is about geometry around the tip and isn’t the standard way nozzle size is defined.