Patent Number: 6,168,069

Title: Method of brazing titanium to stainless steel

Abstract: Surprisingly, silver-copper-palladium brazing alloys, which have hitherto been used only for the brazing of components of the same material, are also very well suited for brazing directly titanium to stainless steel if, the latter component clasps the titanium component tightly, so that the cold joint is under constant compressive stress. In a method for forming the titanium-steel compound the titanium component is provided with a cylindrical end which has a smaller out-side diameter than an adjacent main portion whose external surface is a first surface to be brazed. The cylindrical steel component is a sleeve whose inside diameter is equal to the outside diameter of the main portion and whose internal surface is a second surface to be brazed. A silver-copper-palladium brazing alloy is placed around the end of the titanium component. The steel sleeve is slipped thereover. The whole is heated in a vacuum or an inert gas until the silver-copper-palladium brazing alloy melts and wets the surfaces to be brazed, and is then allowed to cool down.

Inventors: Lorenz; Rainer (Lorrach, DE)

Assignee: Endress +Hauser Flowtec AG

International Classification: B23K 1/00 (20060101); B23K 1/19 (20060101); B23K 35/30 (20060101); B23K 031/02 (); B23K 001/00 (); B23K 020/16 ()

Expiration Date: 01/02/2018