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What's Brazing

What's Brazing

Lankai www.xy-global.com 2018-06-15 10:32:48
Brazing  is a metal-joining process in which two or more metal items are joined together by melting, and flowing a filler metal into the joint, the filler metal having a lower melting point than the adjoining metal.

Application :
The brazing deformation is small and the joint is smooth and beautiful. It is suitable for welding precision, complex and components made of different materials, such as honeycomb structural plates, turbine blades, carbide cutting tools and printed circuit boards. Before brazing, the workpiece must be carefully processed and strictly cleaned to remove the oily and excessively thick oxide film and ensure the assembly clearance. The clearance is generally required to be between 0.01 and 0.1 mm.


Advantages of brazing & disadvantages of brazing

The main advantage:
Brazing has many advantages over other metal joining techniques such as welding. Since the weld does not melt the joined base metal, it can allow tighter tolerances and produce clean joints without the need for secondary processing. In addition, it can weld different metal and non-metal materials (such as metallized ceramics). In general, brazing produces less heat distortion than welding due to uniform heating. Solderable and multi-component workpieces can be welded. Another advantage is that brazing can coat or wrap the parent material for protective purposes. Finally, brazing can be easily adapted to large-scale production and automated, because the individual process parameters are insensitive to changes.

The main disadvantages are:
The joint strength is low. Due to the use of soft-melt fillers, the strength of the welded joint is likely to be lower than the strength of the base metal,but larger than the filler metal. Another disadvantage is that the welded joint may be damaged at high temperatures. In the industrial production environment, the hard joint base metal needs to be highly clean. Some brazing needs to be controlled using an appropriate flux cleaner. The color of the joint is often different from that of the base metal, resulting in aesthetic disadvantages.




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