Electric heating – Metal heating – By arc
Patent
1979-09-06
1981-10-20
Goldberg, Elliot A.
Electric heating
Metal heating
By arc
219 75, 2191251, B23K 9225
Patent
active
042963087
ABSTRACT:
A method and an apparatus for welding an impeller by using a TIG process are provided in which one of the blades to be welded to a side plate or shroud plate is disposed so as to form a V-shaped channel with the plate, the channel being oriented to face upwardly, and a torch head supported at the tip of a torch rod is placed above a weld line produced by the intersection of the blade and the plate so as to contact the inner surface of the channel keeping a proper distance between the tip of the tungsten electrode encased within the torch head and the weld line on which a filler wire of suitable length is disposed. The opposite end of the torch rod is mounted on a translating mechanism through an universal joint so the torch head moves along and above the weld line and electric current is supplied between the weld line on which the filler wire is disposed and the electrode while simultaneously supplying an inert gas through the nozzle during the movement of the nozzle, the nozzle keeping in contact with the inner surface of the channel due to gravity. The nozzle has a specific configuration so that the electrode distance is constant from the apex of the channel when the channel is curved or straight.
REFERENCES:
patent: 2721923 (1955-10-01), Anderson
patent: 3025387 (1962-03-01), Kinney
patent: 3702915 (1972-11-01), Vilkas
patent: 4145595 (1979-03-01), Keller
"Wezdcraft", Add Brochure 5/78.
Nakahama Syuhei
Yamashita Etsu
Carrier Corporation
Goldberg Elliot A.
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