Combined laser and plasma arc welding torch

Details Combined laser and plasma arc welding torch Combined laser and plasma arc welding torch

1996-11-20

1998-01-06

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912146, 21912163, 21912164, 21912184, B23K 2600

Patent

active

057057850

ABSTRACT:
A welding torch which combines features of both laser and plasma-arc welding torches. A laser beam is directed by an objective lens so that it is co-linear with the central axis of a plasma-arc torch. The laser beam passes through a planar or conical cathode electrode placed at the bottom orifice of the torch. A coaxial aperture having a diameter less than that of the laser beam is drilled into the cathode to allow the laser beam to pass through the cathode. A constricting nozzle is placed under the cathode, with the laser beam passing through the axis of the nozzle. As with a standard plasma-arc torch, a gas is forced through a chamber having the cathode and nozzle at its bottom end. As the cathode is heated by the laser radiation, the gas is ionized and a plasma-arc is formed. As the laser beam passes through the nozzle, it comes to a focus and interacts with the plasma-arc formed between the cathode and a workpiece. The resulting interactions between the plasma-arc and laser beam form a plasma-laser discharge which acts to additionally constrict the laser beam and plasma-arc and increase the energy density of the welding spot formed on the workpiece.

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Welding Handbook (American Welding Society), vol. 2, 8th Ed., "Welding Processes, "Chap. 10, Chap. 16 and Chap 22.

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