According to the melting point of the solder, brazing is divided into two categories: soft soldering and hard soldering.
(1) Soldering.
Soldering where the melting point of the solder is lower than 450°C is called soft soldering. The commonly used solder is tin-lead solder, which has good wettability and electrical conductivity and is widely used in electronic products, electrical appliances and auto parts. The strength of welded joints is generally 60-140MPa.
(2) Brazing
Soldering with a melting point of solder higher than 450°C is called brazing, and commonly used solders are brass solder and silver-based solder. Joints using silver-based solder have high strength, conductivity, and corrosion resistance. Solder has a low melting point and good workability, but the price of solder is high, and it is mostly used for parts with high welding requirements. Use brass solder. Brazing is mostly used for steel and copper alloy workpieces with high stress, as well as tool brazing. The joint strength of the brazing is 200 to 490 MPa.
