Patent ID: 6525297
Filing Date: 2003-02-25
Classification: B23K

Abstract:
A MIG welding gun comprising:a. a head tube; b. a conductor that protrudes beyond an end of the head tube; c. a diffuser having upstream and downstream ends and defining a bore between the upstream and downstream ends, the bore adjacent the upstream end having threads that screw to the conductor, the diffuser further having an external thread of a predetermined pitch; and d. a nozzle assembly assembled to the diffuser comprising: i. a nozzle having front and back ends and a predetermined length, a cylindrical section adjacent the back end with a first inner diameter and a first outer diameter and a first wall thickness, and a frusto-conical section adjacent the front end that joins the cylindrical section at a junction, the frusto-conical section having inner and outer surfaces that each converge toward the front end, the frusto-conical section having a second wall thickness at the junction with the cylindrical section that is equal to the first wall thickness, the frusto-conical section having a third wall thickness at the front end; and ii. means in the nozzle for mating with the diffuser thread.