Surface oxide weld penetration enhancement method and article

US6927361B2 · kind B2 · utility

Inventors

• Thomas Joseph Kelly · Cincinnati, US
• Samuel Frank Mastrorocco · Loveland, US
• Earl Claude Helder · Cincinnati, US
• Eva Lanman · Milford, US
• Vallerie Althea McGee · Cincinnati, US

Key dates

• Filing date: Sep 4, 2003
• Grant date: Aug 9, 2005
• Expiry date: Nov 9, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2103/02
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method for welding iron-based or nickel-based superalloy assemblies into a unitary article. First, the assemblies are heated in an air atmosphere, at a rate suitable to minimize geometric distortion, to a temperature in the range of about 1400F (760C) to about 2000° F. (1090° C.) to form an oxide layer on the surface of the assemblies and optionally as a pre-weld solution heat treat. The temperature of the assemblies are then held in a range of about 1400F (760C) to about 2000° F. (1090° C.) for a time sufficient to form an oxide layer of sufficient thickness on the surface of the assemblies and optionally to solution the assemblies. The assemblies are then cooled to ambient temperature at a rate sufficient to avoid precipitation of unwanted metal phases at a rate sufficient to maintain dimensional stability. The oxide layer is then removed from at least the faying surfaces of the assemblies, but not from the face side of the assemblies. The faying surfaces of the assemblies are then cleaned. The assemblies are then welded using a GTA welding procedure to form a unitary article. The article is then resolutioned at an appropriate temperature for an appropriate period of time, both…