Aluminum brazing alloy

Aluminum solder should refer to special solder for aluminum brazing alloy, that is, aluminum solder and aluminum brazing solder.
 
Aluminum solders are generally divided into three categories: one is low-temperature solder, which refers to the addition of zinc or intervening elements to tin or tin-lead alloy, with a melting point of about 150~260°C, which will cause poor performance and corrosion resistance The second is to revisit the soft solder, which refers to the tin-zinc and cadmium-zinc solders with a larger zinc content and a slightly higher melting point, about 260~370, and low strength. Common ones are: HL607; Sn-10Zn, etc. . ℃, indicating, medium corrosion resistance and strength, common ones are: HL501, HL502, Sn-30Zn, etc. The third is high temperature solder, which is based on zinc, adding a small amount of Al, Ag, Cu and other elements, the melting point is about 370~450℃, due to the different content of alloying elements, sometimes its liquidus may exceed 450℃. Its transformability, corrosion resistance, and high strength are common ones: HL505, Zn-5Al, S-Zn89Al7Cu4, S-Zn95Al5, etc.
 
Aluminum brazing filler metals are used in high-strength and high-temperature applications. Generally important aluminum and aluminum brazing alloy products are brazed. Aluminum and aluminum brazing alloy filler metals are mainly eutectic alloys of aluminum and other metals. The melting point and strength are higher than those of soft filler metals. The brazing joints have better corrosion resistance in the atmosphere and water, but in acid and alkali solutions Inferior, far inferior to welding joints, common aluminum brazing materials are: B-Al86SiMg, B-Al67CuSi, B-Al88Si, B-Al79SiZnCu, HL401, HL402, HL403, B62, etc.
 
There are many types of brazing filler metals for aluminum, such as aluminum-based and zinc-based. This type of brazing filler metal is generally only suitable for welding rates and aluminum brazing alloy. The aluminum-based solder is based on aluminum-silicon, aluminum-copper-silicon eutectic alloy, and other elements are added. It can be generally divided into: aluminum-silicon solder, aluminum-silicon-copper solder, aluminum-silicon-copper-zinc solder Three categories. Aluminum-based brazing filler metal can be used as aluminum alloy brazing filler metal or other brazing filler metal.