What is silver brazing?

Silver brazing is a brazing method in which the base metal or solder to be connected is silver.

Brazing refers to a welding method in which the filler metal lower than the melting point of the weldment and the weldment are simultaneously heated to the melting temperature of the solder, and then the liquid filler metal is used to fill the gaps between the solid workpieces to connect the metals.

When brazing, the oxide film and oil stains on the contact surface of the base metal must first be removed to facilitate the capillary function after the solder melts and increase the wettability and capillary fluidity of the solder. According to the melting point of the solder, brazing is divided into hard soldering and soft soldering.

According to the base metal or brazing material being connected, it can be divided into aluminum brazing, stainless steel brazing, titanium alloy brazing, high temperature alloy brazing, ceramic brazing, composite material brazing, and silver brazing. Brazing, copper brazing, etc.

Extended information

Brazing of stainless steel:

Because stainless steel contains Cr, Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other metals Elements, so there are many types of surface oxides, among which the oxides of chromium and chromium have the best chemical stability. A highly active flux and a protective gas or high vacuum brazing method must be used. According to the usage requirements of the brazing parts, the performance of the brazing joint, the brazing temperature, etc., different soft solder materials and hard solder materials can be selected.

Since chromium forms stable oxides, a highly active flux should be used. When soldering, zinc chloride hydrochloric acid solution, zinc chloride-ammonium chloride hydrochloric acid solution or phosphoric acid must be used.

When brazing, Q7101 and QJIV2 can be used when using silver-copper-zinc, silver-copper-zinc-tin solder. When brazing with copper-based solder, QJZOOo containing calcium fluoride should be used

Baidu Encyclopedia-Brazing