Soft solder for stainless steel braze welding

Abstract

The invention discloses a soft solder used in stainless steel brazing. The ratio of the solder comprises 1.0-6.0 wt percent of Cu, 0.01-1.0 wt percent of Ni, 0.001-0.2 wt percent of Li, 0.001-0.1 wt percent of Ti and the rest is Sn. All the percentages are mass percentage. The product in the invention is especially applicable to stainless steel brazing and has the advantages that no inter granularcorrosion occurs among the stainless steels and the welding effect is better.

Description

technical field [0001] The invention belongs to the technical field of solder, and in particular relates to a solder. Background technique [0002] Brazing means that when the operating temperature is lower than the base metal but higher than the melting temperature of the solder, the solder melts into liquid metal while the base metal remains solid, and the liquid solder wets and capillary flows in the gap or on the surface of the base metal , filling, spreading, interacting with the base metal, and forming a firm connection after cooling. It is characterized by small deformation of the workpiece, precise size after welding, and sometimes it can even be "seamless" without processing. Commonly used in brazing of precision parts in aerospace, satellite, radar, electronics and other industries. Brazing includes brazing and soft soldering. Brazing with a solder whose melting temperature is below 450°C is called soldering, and the above is called brazing. Correspondingly, sol...

AI Technical Summary

Problems solved by technology

If the existing commercially available solder is used for soldering, it has the disadvantages of poor wetting and spreading properties, and weakened corrosion resistance of the welded joint, especially the joint area between the solder and the base metal.

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