Patent ID: 6080960
Filing Date: 2000-06-27
Classification: B23K

Abstract:
A method of jointing by heterogeneous welding a first part made of constructional steel and a second part made of austenitic stainless steel, consisting in disposing machined ends of the parts face-to-face to constitute a welding groove extending in a longitudinal direction between said first and second parts and depositing a nickel-based alloy filler in the welding groove in successive layers extending in said longitudinal direction and superposed in a direction perpendicular to said longitudinal direction of said groove corresponding to a thickness of said first and second parts, by melting a wire fed at a particular speed into an electric arc formed between an electrode fed with a particular welding current at a particular voltage and the parts to be welded which are separated, in a direction perpendicular to said longitudinal direction of said groove and to the direction of said thickness of said first and second parts, by a distance constituting the width of said groove, said welding groove being a narrow groove delimited by lateral walls at an angle of less than approximately 5.degree. to a median plane of said groove and having a maximal width of approximately 16 mm, each layer of filler metal essentially comprising a weld bead obtained by melting the filler metal wire occupying practically all of the width of said groove, wherein said method comprises determining the welding current and voltage and the feed rate for said metal wire constituting welding parameters, according to the width of said groove.