US 5,897,801 A · Welding of nickel-base superalloys having a nil-ductility range

Abstract

An article made of a nickel-base superalloy having a nil-ductility range from the solidus temperature of the alloy to about 600.degree. F. below the solidus temperature is welded, as for example in the weld repair of surface cracks, by removing foreign matter from the area to be welded, first stress relieving the article, adjusting the temperature of the article to a welding temperature of from about 1800.degree. F. to about 2100.degree. F., welding a preselected area in an inert atmosphere at the welding temperature, and second stress relieving the article. Welding is preferably accomplished by striking an arc in the preselected area so as to locally melt the alloy in the preselected area, providing a filler metal having the same composition as the nickel-based superalloy of the article, and feeding the filler metal into the arc so that the filler metal is melted and fused with the article to form a weldment upon solidification.

Claims17

Dependent claims

A method of welding a nickel-base superalloy having a nilductility range from the solidus temperature of the alloy to about 600.degree. F. below the solidus temperature, comprising the steps of

furnishing an article made of a nickel-base superalloy having a nil-ductility range from the solidus temperature of the alloy to about 600.degree. F. below the solidus temperature;
removing any foreign matter present in a welding area of the article to be welded;
first heating the article at a first stress-relieving temperature in the nil-ductility range;
adjusting the temperature of the article to a bulk-material welding temperature within the nil-ductility range, but less than the first-stress-relieving temperature;
welding the welding area of the article, in an inert atmosphere, at the welding temperature;
and
second heating the article from the welding temperature to a second stress relieving temperature in the nil-ductility range, but above the welding temperature,
the steps of first heating, adjusting, welding, and second heating being accomplished without reducing the temperature of the welding area to substantially less than the bulk temperature of the article.

5 more elements

A method of welding a nickel-base superalloy having a nil-ductility range from the solidus temperature of the alloy to about 600.degree. F. below the solidus temperature, comprising the steps of

furnishing an article made of a nickel-base superalloy having a nil-ductility range from the solidus temperature of the alloy to about 600.degree. F. below the solidus temperature;
removing any foreign matter present in a welding area of the article to be welded;
first heating the article to a temperature of from about 2000.degree. F. to about 2200.degree. F.;
adjusting the temperature of the article to a bulk-material welding temperature of from about 1800.degree. F. to about 2100.degree. F.;
and
welding the welding area of the article, in an inert atmosphere, at the bulk-material welding temperature, the step of welding including the steps of
striking an arc in the welding area so as to locally melt the alloy in the welding area,
providing a filler metal, and
feeding the filler metal into the arc so that the filler metal is melted and fused with the article;
and
second heating the article from the bulk-material welding temperature to a temperature of from about 2000.degree. F. to about 2200.degree. F., the steps of first heating, adjusting, welding, and second heating being accomplished without reducing the temperature of the welding area to substantially less than the bulk temperature of the article.

8 more elements

Dependencies are inferred from the claim text.

Welding of nickel-base superalloys having a nil-ductility range

Life of this patent

Welding of nickel-base superalloys having a nil-ductility range

Life of this patent

Abstract

Claims17