Explanation

The fusion materials used in fiber welding. brazing filler metal is mainly metallic materials, which can be pure metal or multi-component alloy. When used for sealing alumina ceramics and niobium alloy, oxide brazing filler metal (commonly known as sealing glass) is also used. The materials used as brazing filler metal shall have the following characteristics: suitable melting temperature, its liquidus shall be lower than that of the connected base metal; At the soldering temperature, the base metal can be wetted, and mutual dissolution, diffusion and interface metallurgical reaction can occur between the base metal and the base metal to fill the joints and form sample joints. Depending on the melting temperature. brazing filler metal can be divided into soft brazing filler metal (liquidus below 450 ° C) and hard brazing filler metal (liquidus above 450 ° C). Soft brazing filler metal mainly includes Sn Pb brazing filler metal, Sn Zn brazing filler metal, Cd Zn brazing filler metal, Bi based brazing filler metal, In based brazing filler metal, etc. Hard fiber materials mainly include Al based brazing filler metal, Ag based brazing filler metal, Cu based brazing filler metal, Ni based solder, Au based brazing filler metal, Pd based brazing filler metal, etc. The melting temperature of soft solder is relatively low, and common heat sources such as soldering iron and blowtorch can be used for soldering, which is easy to operate and cheap. Widely used in industry; However, the low melting temperature and mechanical properties limit the use of soft soldering joints only in the environment of low working temperature and low stress. I When soldering joints are required to have high comprehensive properties, brazing filler metal must be used.

Classification