Question

this part delivers shielding gas to the nozzle which protects the molten metal.

contact tip
diffuser
liner
nozzle

Explanation:

Identify the component function

Using the GMAW Gun Anatomy knowledge point

• The question asks for the part of a GMAW (MIG) gun that delivers shielding gas to the nozzle.
• The gas diffuser contains small holes that distribute and direct the shielding gas evenly into the nozzle, which then directs it over the weld pool to protect the molten metal.
• Let's evaluate the other options:
• Contact Tip: Guides the welding wire and transfers electrical current to it.
• Liner: Guides the welding wire from the wire feeder through the gun cable to the contact tip.
• Nozzle: Directs the shielding gas onto the weld zone (the question states the part delivers gas to the nozzle).
• Therefore, the correct component is the Diffuser.

Answer:

• (A) Contact Tip
• (B) Diffuser (Correct answer)
• (C) Liner
• (D) Nozzle