Brazing is characterized by smooth surface of joints, good air tightness, stable shape and size, little changes in the structure and performance of welding parts, can connect the same or not the same metal and part of the non-metal.During brazing, the whole workpiece can be heated to finish many welds at one time, which improves the productivity.But the strength of brazing joint is low, mostly using lap joint, by increasing the length of lap joint to improve the joint strength;In addition, the preparation before brazing requires higher requirements.At present, brazing has been widely used in machinery, motor, instrument, radio and other departments.
Brazing is characterized by melting of solder and not melting of solder.In order to make brazing joint part firmly connected, enhance the solder solder adhesion, brazing to use flux, in order to remove the solder and solder surface of the oxide.Brazing alloy (such as copper base, silver base, aluminum base, nickel base, etc.), with high strength, can be connected to the bearing parts, more widely used, such as hard alloy, bicycle frame.Compared with solder (such as tin, lead, bismuth, etc.), it has lower welding intensity and is mainly used for welding of welding parts that can not bear load but require good tightness, such as containers, instrument components, etc.Brazing is widely used in the manufacturing of machinery, motor, instrument and radio.
Brazing alloy with melting point lower than the base metal is used as brazing material. When heated, the solder metal melts, and fills up and maintains in joint gap by wetting and capillary action. While the base metal is in solid state, brazing joint is formed by mutual diffusion between liquid solder and solid base metal.Brazing has little influence on physical and chemical properties of base material, less welding stress and deformation, and can be used for heterogeneous metals with great difference in welding properties. It can complete multiple welds at the same time, with beautiful and neat appearance of joints, simple equipment and small production investment.But the strength of brazing joint is low and the heat resistance is poor.
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