Brazing is a kind of ZHI welding process DAO in which the brazing bai material is melted by flame and penetrated into the gap between the workpiece DU to make it stick firmly.
Brazing is a method of using metal material with lower melting point than the base metal as filler, heating the solder and filler to a temperature higher than the melting point of the base metal and lower than the melting temperature of the base metal, wetting the base metal with liquid solder, filling the joint gap and diffusing with the base metal to realize joint welding.
Small brazing deformation, smooth and beautiful joints, suitable for welding precision, complex and composed of different materials, such as honeycomb structure plate, turbine blade, carbide tool and printed circuit board, etc.Before brazing, the workpiece must be processed carefully and cleaned strictly to remove grease and excessively thick oxide film and ensure the interface assembly clearance.Clearance is generally required to be between 0.01 and 0.1 mm.
Features of brazing:
1. The surface of the joint is smooth and clean, with good air tightness, stable shape and size, and little change in the structure and performance of the welding parts. The joint can be connected with the same or different metals and some non-metals.In the process of brazing, the whole workpiece can be heated to finish many welds at one time, which improves the productivity.However, the strength of brazed joints is low, so overlapped joints are mostly used to improve the strength of brazed joints by increasing the length of welded joints.In addition, the preparation before brazing requires higher requirements.
2. Solder melts but solder does not.In order to make the brazing part firmly connected and enhance the adhesion of the solder, brazing agent should be used in order to remove the oxide on the solder and the solder surface.
3, hard solder, with high strength, can be connected to bear the load of the parts, widely used, such as carbide tools, bicycle frames.Solder, low welding strength, mainly used for welding welding parts that do not bear loads but require good sealing, such as containers, instrument components, etc.
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