First of all, the surface of the joint is clean, closed, stable in shape and size, the structure and performance of the welded parts is very little, can be connected to the same or different metals and some non-metals.During brazing, the whole piece can be heated to weld more than one weld at a time, increasing productivity.However, the strength of brazed joints is low, most of them are lap joints, and the strength of the joints can be improved by increasing the length of lap joints.In addition, the preparation of pre-welding requires higher requirements.

Second, the solder melts, but the solder does not.In order to securely connect the brazing parts and enhance the adhesion of the brazing filler metal, the brazing filler metal shall be used during brazing to remove oxides from the brazing filler metal and the surface of the solder joint.Brazing filler metals (such as copper, silver, aluminum, nickel, etc.)It has high strength and can be used to connect load-bearing parts.They are widely used, such as hard alloy tools and bicycle frames.Soft solder (e.g. tin, lead, bismuth, etc.), low welding strength, mainly used for non-bearing but good sealing welding parts, such as containers, instrument components, etc.

Brazing USES an alloy with a melting point lower than the base metal as the filler metal.When heated, the brazing filler metal melts and is filled and retained in the joint clearance by wetting and capillary action, while the base metal is in a solid state, and the brazing joint is formed by the mutual diffusion between the liquid brazing filler metal and the solid base metal.Brazing has little influence on the physical and chemical properties of the base metal, small welding stress and deformation, different metals with great difference in weldability can be welded, and several welding can be completed at the same time. The joint appearance is beautiful and neat, the equipment is simple, and the production investment is small.However, the brazing joint has low strength and poor heat resistance.