关键词: 热应力, 激光焊接, 微波组件, 玻璃绝缘子, 密封

Abstract: Laser welding technology is widely used in microwave components, and the high heat released during the welding process has a fatal impact on the reliability of the product. In this paper, the thermal stress generated during laser welding of microwave module cavity is studied by means of simulation technology and experimental verification. The simulation results show that the stress of the glass insulator decreases with the distance between the weld and the billet and the product volume increases under the same welding process parameters. The experimental results also show that there is a correlation between the failure rate and the welding distance and product volume under different structures. Compared with the single-sided cavity, double-sided cavity glass blank failure rate of the welding distance, the product volume is more sensitive, that is, when the volume decreases, shorten the welding distance, double-sided cavity products appear billet failure probability is higher.

Key words: thermal stress, laser welding, microwave components, glass insulator, seal