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Lihua Technology(HK) Industrial Co., Ltd.

What Should be Paid Attention to When Brazing Cemented Carbide?

Cemented carbide is commonly brazed by flame, induction, furnace, resistance and dipping methods. Flame brazing is suitable for single piece production in small batches. Induction brazing, furnace brazing and resistance brazing have high productivity and relatively stable quality.


When brazing cemented carbide, in order to reduce brazing stress and prevent cracking, the following measures can be taken:
1. Reasonably design joints
• The thickness ratio of the base metal to the cemented carbide is 3:1, which can reduce the tensile stress in the cemented carbide;
• Should try to avoid the use of closed slot form, reduce the brazing surface that is not on the same plane, so as to reduce the restraint of the cemented carbide and improve its stress state;
• For large area cemented carbide brazed joints, some process grooves should be opened on the base body, which can not only discharge slag, but also divide the brazing area into several small pieces to reduce the brazing stress.


2. Add a compensation gasket in the brazing seam
• Use the plastic deformation of the compensation gasket to relax the brazing stress in the joint;
• When brazing with copper and copper-based brazing filler metal, Monel alloy is used as the compensation gasket material due to the high brazing temperature;
• When silver-based solder is used, pure copper, constantan and other materials can be used as compensation gaskets;
• The thickness of the compensation gasket is generally 0.3~0.5mm. For large-area brazing joints, the thickness of the compensation gasket should be larger.

3. Control the heating and cooling speed
• In order to avoid cracks caused by the excessive temperature difference between the surface layer of the cemented carbide and the internal temperature, the heating and cooling rate should be controlled during brazing, and the rapid cooling and heating should not be performed;
• After brazing, heat preservation and tempering at 320~350℃ for 6h can generally reduce and eliminate the residual stress in the joint and prevent cracks.
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