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1. Matching of brazing material and base material
For the determined base material, the selected brazing material should have a proper melting point, good wetting and filling ability to the base material. The interaction with the base material can produce beneficial results and avoid the formation of brittle intermetallic compounds.
2. Matching of brazing material and brazing method
Different brazing methods have different requirements for brazing material performance, such as when using flame brazing, the melting point of the brazing material should be as different as possible from the melting point of the base material to avoid possible local overheating, overburning or melting of the base material, etc.; when using resistance brazing methods, it is hoped that the resistivity of the brazing material is somewhat greater than that of the wood to improve the heating efficiency; the content of volatile elements in the brazing material should be less when brazing in the furnace to ensure that in a relatively The content of volatile elements in the brazing material in the furnace should be low to ensure that the performance of the brazing material will not be affected by the volatilization of alloying elements within a relatively long brazing time.
3. Ensure that the use requirements are met
These requirements may involve electrical conductivity, thermal conductivity, working temperature, mechanical properties, sealing, oxidation resistance, corrosion resistance, etc. The main requirements should be considered when selecting brazing materials. The most common requirements for brazed joints are strength, oxidation resistance and corrosion resistance. When in doubt, some specimens can be taken through experiments to determine whether the joint meets the necessary working time, temperature and strength requirements.
4. Brazing structure requirements
The complexity of the brazing structure sometimes requires the brazing material to be pre-processed and shaped, such as in the form of rings, gaskets, gaskets, foils and powders, etc., and placed in or near the brazing gap in advance. Therefore, the brazing material is selected with due consideration to whether its processing properties can be made into the required form.
5. Production cost
This includes the cost of the brazing material, the cost of the forming process, and the cost of the brazing method and equipment investment. When the production volume is not large, the performance and quality of the product are given priority; the reduction of brazing material cost in large volume production is of great economic importance.
The correct selection of brazing material is the key to ensure the quality of brazed joints, and should be determined by considering the mutual matching of brazing material and base material, the requirements of the working conditions of the brazed parts, the existing equipment conditions and the economy.
