Lihua Technology(HK) Industrial Co., Ltd.

Focus on Induction heating for 19 years

Large manufacturer of Induction heating automation equipment

+86 135 3907 6945 sales08@lihuachina.com
Lihua Technology(HK) Industrial Co., Ltd.

What Is the Purpose of Heat Treatment After Brazing?

The purpose of heat treatment after brazing of the part is to remove the stress in the material and produce an internal force that interacts between the various parts of the object to resist the action of this external cause, and to try to restore the object from the deformed position to the before deformation. The position to improve the overall performance of the brazed parts is specifically manifested in the following two aspects:

brazing

① The change of thermal cycle during brazing will cause changes in the properties of the base metal. Therefore, the heat treatment after brazing is mainly performed to restore the properties of the base metal.

brazing

② When arranging for heat treatment to strengthen the base material itself, if possible, consider choosing a brazing material with a suitable brazing temperature, so that the two processes of brazing and heat treatment can be completed in the same thermal cycle to improve productivity. If the heat treatment of the weldment is arranged separately after brazing, the maximum temperature of the heat treatment must be performed below the remelting temperature of the solder to avoid cracking of the brazing seam and deformation of the weldment. There are two main types of heat treatment to improve and enhance the overall performance of brazed joints.
a. Diffusion treatment to improve the structure of brazed joints. Diffusion treatment can often be completed in the same thermal cycle as the brazing process, or diffusion treatment can be performed separately. When vacuum separate diffusion treatment is used, the heat treatment temperature should be controlled below the solidus temperature of the solder.
b. Annealing treatment to eliminate residual stress.
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