Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1994-05-04
1996-06-18
Valentine, Donald R.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204284, 204286, 204289, 204290R, 204290F, 204293, 219119, 21914521, 21914621, 21914622, B23H 104, B23H 722
Patent
active
055274412
ABSTRACT:
A welding electrode for providing a significant improvement in the detrimental tensile residual stress condition on the root side of welds, especially on the inside wall of piping welds. The electrode has a tungsten alloy blade. The blade is made from sheets of tungsten alloy by cutting or stamping. The preferred shape of the blade is an isosceles triangle. The base of the flat triangular blade is secured in a slot formed in an electrode holder. The electrode holder is preferably T-shaped, with the shank of the holder being connected to a conventional welding torch. The holder is made of electrically conductive material, whereby the blade is coupled to the torch for producing an electric arc at the blade tip for welding. The blade is optionally covered with a ceramic coating to prevent arcing to the side walls of the groove formed between the parts being welded. A further option is to incorporate insulating stand-offs which protrude from both flat sides of the electrode blade. These stand-offs serve to maintain a minimum gap between the side walls of the welding groove and the flat sides of the electrode blade, thus preventing the ceramic coating from being scratched off during electrode travel relative to the groove.
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patent: 4920946 (1990-05-01), Kuromatsu
General Electric Company
McGinness James E.
Valentine Donald R.
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