Manual keyhole plasma arc welding system

Details Manual keyhole plasma arc welding system Manual keyhole plasma arc welding system

1990-06-06

1991-09-03

Paschall, M. H.

Electric heating

Metal heating

By arc

2191215, 21912152, 21912149, 21912145, B23K 900

Patent

active

050456679

ABSTRACT:
A manual keyhole plasma arc welding system including a power source; a manual arc welding torch assembly which includes, a) a hollow shield cup, b) a orifice subassembly concentrically disposed within the shield cup, and c) an electrode concentrically disposed within the orifice subassembly; a shield gas source; and a plasma gas source. A shield gas discharge annulus is formed between a terminal edge of the shield cup and the terminal end of the orifice subassembly. The terminal edge of the shield cup is extended beyond the terminal end of the orifice subassembly to produce a laminar shield gas discharge flow through the discharge annulus, providing cooling of the orifice subassembly. A plasma gas discharge annulus is formed between the terminal end of the orifice subassembly and a terminus of the electrode. A first terminal of the power source is connected to the electrode and a second terminal of the power source is connected to the workpiece. The power source provides a sinewave alternating current. A transferred arc is formed between the electrode and the workpiece. The power density is sufficient to provide keyhole welding, the reversing sinewave polarities providing simultaneous keyhole penetration and cathodic cleaning, eliminating the requirement of substantial workpiece surface preparation and/or removal of internal workpiece defects.

REFERENCES:
patent: 3250893 (1966-05-01), Nestor
patent: 3278720 (1966-10-01), Dixon
patent: 3832513 (1974-08-01), Klasson
patent: 4833294 (1989-05-01), Montaser et al.

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