Method for welding cryogenic alloys

Details Method for welding cryogenic alloys Method for welding cryogenic alloys

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

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