Method of and device for plasma-MIG welding

Claim 3

A plasma-MIG welding torch, which comprises a cylindrical housing; a cylindrical support electrically connected to the interior of said cylindrical housing; a single nozzle non-consumable electrode positioned adjacent one end of said cylindrical support, said single nozzle comprising a central ring and a plurality of ribs extending radially from said central ring to said cylindrical support and providing electrical connection therebetween; means for flowing a thermally ionizable gas stream from a common gas source through said single nozzle non-consumable electrode toward a workpiece to thereby split said gas stream into a central gas column surrounded by a parallelly flowing annular gas sheath both having the same composition as they flow past the single nozzle outlet; means for feeding a consumable electrode through said central gas column toward the workpiece; a first circuit means consisting basically of said consumable electrode, a first power supply, and said workpiece for establishing a MIG-arc between the consumable electrode and the workpiece; and a second circuit means consisting basically of a second power supply, said single nozzle non-consumable electrode, and said workpiece for establishing a plasma arc between the single nozzle non-consumable electrode and the workpiece to ionize said central gas column and sustain a plasma flow enveloping said MIG-arc without ionizing the surrounding annular gas sheath.

Claim 4

A plasma-MIG welding torch, which comprises a cylindrical housing; a cylindrical support electrically connected to the interior of said cylindrical housing; a single nozzle non-consumable electrode positioned adjacent one end of said cylindrical support, said single nozzle comprising a central ring and a plurality of ribs extending radially from said central ring to said cylindrical support and providing electrical connection therebetween; means for flowing a thermally ionizable gas stream from a common gas source through said single nozzle non-consumable electrode toward a workpiece to thereby split said gas stream into a central gas column surrounded by a parallelly flowing annular gas sheath both having the same composition as they flow past the single nozzle outlet; means for feeding a consumable electrode through said central gas column toward the workpiece; a first circuit means consisting basically of said consumable electrode, a first power supply, and said workpiece for establishing a MIG-arc between the consumable electrode and the workpiece; and a second circuit means consisting basically of a second power supply, said single nozzle non-consumable electrode, and said workpiece for establishing a plasma arc between the single nozzle non-consumable electrode and the workpiece to ionize said central gas column and sustain a plasma flow enveloping said MIG-arc without ionizing the surrounding annular gas sheath.

Claim 5

A plasma-MIG welding torch according to claim 1, which includes means in the region of the single nozzle non-consumable electrode for guiding the portion of the gas stream passing around the central ring to assist in the formation of the surrounding annular gas sheath.

Claim 6

A plasma-MIG welding torch according to claim 2, in which said guiding means is electrically insulated from the cylindrical support and also spaced outwardly thereof, and which includes cooling water in the space between said guiding means and said cylindrical support.