US 8,525,068 B2 · Plasma torch with swirl-inducing nozzle and method of using same

Abstract

A plasma torch 1 used in plasma-arc welding is provided with a rod-shaped electrode 10, a first cylindrical nozzle 11 which is provided to surround the electrode 10 and which injects a plasma gas and a second cylindrical nozzle 12 which is provided to surround the first nozzle 11 and which injects a shielding gas. A second injection opening 121 of the second nozzle 12 directs in a substantially parallel direction with respect to an axial direction of the electrode 10 or in a direction being away from the electrode 10, and a plurality of groove portions inclining with respect to the axial direction of the electrode 10 are formed in an outer circumferential surface of the first nozzle 11 or an inner circumferential surface of the second nozzle 12.

Claims9

Dependent claims

A plasma torch for plasma-arc welding comprising:

a rod-shaped electrode;
a first cylindrical nozzle surrounding the electrode and configured to inject a plasma gas;
and
a second cylindrical nozzle surrounding the first nozzle and configured to inject a shielding gas,
wherein an injection opening of the second nozzle spreads in a substantially parallel direction relative to an axial direction of the electrode or in a direction away from the electrode,
wherein a plurality of groove portions inclining with respect to the axial direction of the electrode are formed in an outer circumferential surface of the first nozzle or an inner circumferential surface of the second nozzle, and
wherein the plasma torch is configured such that when butt-welding together two workpieces having different thicknesses, including a thinner workpiece and a thicker workpiece, the grooves incline so as to direct a flow of the shielding gas toward the thinner workpiece.

4 more elements

Dependencies are inferred from the claim text.

Plasma torch with swirl-inducing nozzle and method of using same

Life of this patent

Plasma torch with swirl-inducing nozzle and method of using same

Life of this patent

Abstract

Claims9