Cadmium-free and low-silver filler metal containing manganese and tin and production method of cadmium-free and low-silver filler metal

Abstract

The invention relates to cadmium-free and low-silver filler metal containing manganese and tin and a production method of the cadmium-free and low-silver filler metal, which are suitable for brazing copper alloys such as stainless steel, red copper and brass. The cadmium-free and low-silver filler metal is prepared from the following components in percentage by weight: 13 to 19 percent of Ag, 25.5 to 38 percent of Zn, 35 to 40 percent of Cu, 1.0 to 5.5 percent of Sn, 7 to 14 percent of Mn, 0.5 to 3.0 percent of Ni and 0.001 to 0.3 percent of trace element R, wherein the trace element R is prepared from one or more of lanthanum, cerium, silicon and antimony. The invention further provides the production method of the cadmium-free and low-silver filler metal containing the manganese and the tin. The production method comprises the following steps of adopting an intermediate frequency melting furnace to melt and cast; during melting, adding the components according to the sequence of Ag, Cu, Sn, Zn and Cu-Mn for melting; then adding a trace Cu-R alloy; finally, producing the cadmium-free and low-silver filler metal containing the manganese and the tin by techniques such as casting, saw stripping, extruding, drawing, forming and cleaning. The silver content of the cadmium-free and low-silver filler metal containing the manganese and the tin, disclosed by the invention, is lower than that of 20 percent of silver filler metal; the cadmium-free and low-silver filler metal containing the manganese and the tin does not contain cadmium element and is lower in melting temperature; and a multicomponent silver filler metal with good processing performance is used for brazing the red copper, the brass and the stainless steel.

Description

technical field [0001] The invention relates to a cadmium-free low-silver solder containing manganese and tin and a preparation method thereof, which is suitable for brazing stainless steel, copper, brass and other copper alloys, and belongs to a medium-temperature brazing material. Background technique [0002] When brazing copper and copper alloys with ferrous metals such as iron and their alloys, considering the wettability of the brazing material to the brazing base material and the mechanical properties of the brazed joint, most people choose silver solder. Four-way valve, a control valve with four oil ports, is an indispensable key component in refrigeration equipment. The cold and hot gas circulates, and the working environment is relatively harsh. It needs to be welded with silver solder with strong reliability. The four-way valve is welded The requirements are very high reliability, fatigue resistance, good corrosion resistance, and high welding strength. BAg45CuZn...

AI Technical Summary

Problems solved by technology

Although the invention can improve the wettability and joint strength of the solder by adding a small amount of nickel and manganese in the silver solder, the content of the silver element is still relatively high, so it still has the above-mentioned defects

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