Low-silver brazing filler metal containing nickel and indium

Abstract

The invention introduces low-silver brazing filler metal containing nickel and indium and relates to the technical field of welding. The low-silver brazing filler metal is obtained by melting silver, copper, zinc, indium and nickel according to proportion, uniformly stirring and casting, extruding and pulling a cast ingot. The brazing filler metal includes, by weight, 39-41% of silver, 27-31% of zinc, 1.0-4.0% of indium, 0.5-2.0% of nickel and the balance of copper. A small quantity of nickel and indium is added into the silver brazing filler metal, wettability and joint strength of the brazing filler metal can be improved when the nickel enter the brazing filler metal, and processing performance is improved. The indium can more remarkably improve solid and liquid phase lines of the brazing filler metal, fusion range of the brazing filler metal is reduced, and mobility of the brazing filler metal is improved, so that the joint strength can be improved. Content of the silver can be reduced by adding other elements, and production cost is effectively reduced.

Description

Technical field [0001] The present invention relates to the field of welding technology, in particular to a low-silver solder containing nickel and indium. Background technique [0002] Silver brazing filler metal is a kind of brazing filler metal widely used for brazing low-carbon steel and stainless steel at present. It has excellent process performance, suitable melting point, good wetting and gap-filling ability, but the traditional silver brazing filler metal Containing cadmium, due to the harm of cadmium to human health and the pollution to the environment, the practical use of cadmium in solders is restricted internationally, so solder researchers are looking for alternatives to cadmium to use in solders, but these solders The material system is far behind the traditional cadmium-containing silver solder in terms of price, brazing process performance or processing performance. To obtain the same performance as traditional cadmium, it is usually necessary to increase the s...

AI Technical Summary

Problems solved by technology

[0002] Silver brazing filler metal is a kind of hard brazing filler metal widely used in brazing low carbon steel and stainless steel at present. It has excellent process performance, suitable melting point, good wetting and ability to fill gaps, but the traditional Contains cadmium element. Due to the harm of cadmium to human health and pollution to the environment, the practicality of cadmium element in solder is limited internationally. Therefore, solder researchers are looking for cadmium substitutes to use in solder, but these solder There is a gap between the material system and the traditional cadmium-containing silver solder in terms of price, brazing process performance or processing performance.