Brazing filler metal for braze welding of titanium and titanium alloy, preparation method and braze welding method

Abstract

The invention discloses a brazing filler metal for the braze welding of titanium and titanium alloy, which contains 22 to 32 percent by weight of Ni, 1 to 1.5 percent by weight of Al, 0.5 to 1.0 percent by weight of Mn, 0.3 to 0.6 percent by weight of V, 0.6 to 1.0 percent by weight of Sn, 1.5 to 2 percent by weight of Zr and the balance of Cu. The preparation method for the brazing filler metal includes the following steps: weighing the materials, casting the smelted materials to form a brazing filler metal ingot, and then extruding and rolling the brazing filler metal ingot into a braze welding foil. An argon-shielded condenser discharge resistance heating method is adopted to weld titanium with the brazing filler metal. The brazing filler metal does not contain precious metals, i.e. palladium and silver, and thereby the manufacturing cost can be greatly reduced; the processability of the brazing filler metal is good, the inter-annealing processing rate is high, a foil strip which is 0.1mm can be rolled, and the rate of finished products is 80 to 85 percent. Meanwhile, the preparation method is simple, the strength of a braze-welded titanium joint is high, the braze-welding timeis short, the metallic texture of the titanium alloy matrix cannot be changed, and in particular, the invention is suitable for the braze welding of titanium alloy parts of small specifications in large batches.

Description

technical field [0001] The invention relates to the field of brazing material processing, in particular to a brazing filler metal for titanium and titanium alloy brazing, and also relates to a preparation method of the brazing filler metal and a method for brazing a titanium substrate with the brazing filler metal. Background technique [0002] At present, titanium and titanium alloys are widely used in industrial production and social life. Due to their small specific gravity, high strength, corrosion resistance and good biocompatibility, titanium and titanium alloys are widely used in aerospace, chemical industry, biomedicine and civil The important role in life and other fields is irreplaceable. With the extensive application of titanium and titanium alloys, the demand for brazing filler metals for titanium and titanium alloys has also increased significantly. [0003] Since titanium is a highly chemically active metal, brazing is difficult, and it needs to be brazed und...

AI Technical Summary

Problems solved by technology

Since palladium and silver are rare and precious metals, national resources are limited, palladium-based and silver-based solders are expensive, and their use is limited by two factors: price and resources; while titanium-based solders are relatively brittle and have poor processability, so the preparation of solders It is difficult to meet the needs of mass industrial production; the brazing strength of aluminum-based solder is low, and it can only be used in working conditions that do not require high strength

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