MIG gun nozzle with self centering, quick release screw and reduced cross-sectional area at the front

A MIG gun nozzle with self centering, quick release screw and reduced cross-sectional area at the front comprising:

• a. a nozzle assembly comprising:
• i. a nozzle that defines a nozzle longitudinal axis;
• ii. an insulator pressed in the nozzle;
• and
• iii. an insert inside the insulator, the insert defining an insert longitudinal axis concentric with the nozzle longitudinal axis and having a selected surface and an internal thread of a predetermined pitch and thread form;
• and
• b. a diffuser that defines a diffuser longitudinal axis and that has an external thread of the predetermined pitch and thread form and having at least one complete turn, the diffuser having a selected diffuser surface that is engaged by the selected insert surface when the nozzle assembly is fully assembled to the diffuser, the selected diffuser and insert surfaces cooperating to limit the nozzle assembly to one complete turn on the diffuser to fully assemble the nozzle assembly to the diffuser.

A method of assembling a MIG welding gun comprising the steps of:

• a. providing a diffuser having a diffuser longitudinal axis, a selected surface, and an external thread of a predetermined pitch and thread form;
• b. providing a nozzle assembly having a nozzle with a nozzle longitudinal axis, an insulator inside the nozzle, and an insert inside the insulator, the insert having a selected surface and an internal thread of the predetermined pitch and thread diameter;
• and
• c. turning the insert thread a single turn on the diffuser thread and then engaging the selected insert surface with the selected diffuser surface and thereby fully assembling the nozzle assembly on the diffuser with the single turn of the nozzle assembly.

A method of assembling a MIG welding gun comprising the steps of:

• a. providing a diffuser having a longitudinal axis, a diffuser frusto-conical back ramp, and an external thread of a predetermined pitch and thread form;
• b. providing a nozzle assembly having a nozzle with a nozzle longitudinal axis, an insulator inside the nozzle, and an insert inside the insulator concentric with the nozzle, the insert having an insert frusto-conical back ramp and an internal thread of the predetermined pitch and thread form;
• and
• c. turning the insert thread on the diffuser thread until the insert back ramp engages the diffuser back ramp.