Forming stable welded joints between dissimilar metals

Details Forming stable welded joints between dissimilar metals Forming stable welded joints between dissimilar metals

1986-10-16

1987-10-27

Jordan, M.

Metal fusion bonding

Process

With subsequent treating other than heating of bonded parts...

228226, 228227, 148127, 285173, B23K 104

Patent

active

047024062

ABSTRACT:
A method of forming a stable welded joint between low alloy steels and austenitic stainless alloy steels which is characterized by increased resistance to chemical corrosion and mechanical stress and which has a greatly extended service lifetime. The method comprises forming a deposit of a low alloy steel containing niobium onto a portion of low alloy steel to be welded; heating the deposit to a first temperature at which all carbides present therein have dissolved; quenching the deposit and forming a solid solution of the elements of the dissolved carbides; and reheating the deposit for a time period and at a second temperature sufficient to form niobium carbides therein containing substantially all of the carbon present in the deposit. The austenitic stainless steel portion is welded to the deposit using a substantially nonferrous nickel-based alloy as the weld filler material, thereby joining the low alloy steel portion to the austenitic stainless steel portion.

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