Question

this part supplies shielding gas to protect the molten metal from the atmosphere.

diffuser
nozzle
contact tip
liner

Explanation:

Identify the component function

Using the GMAW Gun Anatomy and GMAW Consumables Identification knowledge points

The question asks to identify the part of a welding gun that supplies shielding gas to protect the molten metal from the atmosphere.

Analyze the options

• Diffuser: Distributes the shielding gas evenly around the contact tip into the nozzle.
• Nozzle: Directs and channels the shielding gas flow directly onto the weld pool to shield it from atmospheric contamination.
• Contact Tip: Transfers the electrical current to the welding wire.
• Liner: Guides the welding wire from the wire feeder through the gun cable to the contact tip.

Therefore, the nozzle is the component that physically directs and supplies the shielding gas envelope over the molten weld pool.

Answer:

• Diffuser
• Nozzle (Correct answer)
• Contact Tip
• Liner