汽车换热器钎焊工艺研究

为了改善换热器钎焊质量,设置608、611、614和617℃的4组钎焊温度,观察焊缝金相及测试材料性能。结果显示随着钎焊温度的升高,材料的屈服强度会因为材料晶粒增长而逐渐减小。适当升高钎焊温度在611~614℃之间时,焊缝溶蚀少,气密检测合格率与爆破压力较高,焊接质量较好。该文提供一些钎焊质量优化措施,利于生产时参考执行。

This study aims to improve the quality of brazing for heat exchangers by setting four different brazing temperatures(608℃,611℃,614℃,and 617℃)and observing the microstructure and properties of the test materials.The results showed that increasing the brazing temperature resulted in decreased yield strength due to the growth of material grains.However,when the temperature was raised between 611℃and 614℃,the weld corrosion is less,the qualified rate of airtight inspection and blasting pressure are higher,and the welding quality is better.This paper provides some measures to optimize the brazing quality,which can be used for reference in production.