Electric heating – Metal heating – By arc
Patent
1995-09-20
1998-11-17
Yee, Deborah
Electric heating
Metal heating
By arc
219 74, 2191372, 21914623, 2191379, B23K 916, B23K 900
Patent
active
058379690
ABSTRACT:
An alloy comprising nickel, chromium, molybdenum, manganese, nitrogen and on in amounts such that a weld metal formed therefrom is austenitic, wherein nitrogen is present in a concentration of from about 0.1 to about 0.2% of the alloy in weight percent. The weld metals prepared from the alloys of the present invention possess superior properties as compared to other stainless steels. These properties include inter alia a superior tearing modulus, fracture toughness, and yield strength, even at cryogenic temperatures.
The present invention further provides a method for welding a metal part which is intended for exposure to cryogenic temperatures comprising welding the metal part using a welding electrode comprising nickel, chromium, molybdenum, manganese, nitrogen and iron in amounts such that a weld metal formed therefrom is austenitic, wherein nitrogen is present in the electrode in a concentration of from about 0.1 to about 0.2% of the electrode in weight percent. Preferably, the welding comprises gas metal arc welding, wherein shielding gas used during welding contains no more than about 2% oxygen by volume.
REFERENCES:
patent: 3644697 (1972-02-01), Krahl
patent: 3740525 (1973-06-01), Baumel
McCowan Christopher N.
Siewert Thomas A.
The United States of America as represented by the Secretary of
Yee Deborah
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