关键词: 熔深, 激光波形, 气密性

Abstract: The relationship between the energy transformation and transfer process of photon excited electron and process parameters in laser sealing is studied, and the relationship between shell absorbed energy, penetration and process parameters is also analyzed. The results show that the energy decreases exponentially with the increase of penetration, and the welding is terminated after reaching the critical point. By changing the laser waveform, power, pulse width, speed, frequency, defocusing amount and other process parameters, the electronic transition and energy transfer process of the welding materials can be controlled. In order to meet the requirements of air tightness and mechanical reliability test, it is necessary to reasonably control the metal vapor, width and depth of molten pool during melting, so as to control the defects such as weld crack, porosity and ablation.

Key words: penetration, laserwaveform, airtightness