关键词: 红外辐射, 激光软钎焊, 润湿识别, 质量控制

Abstract: The joint dynamic formation process and the relationship between the infrared radiation signal and the joint formation are studied by high speed photography in SMT laser soldering. The kinks of the infrared and its differential signal curves appeared in the wetting process of the solder, therefore the joint qualification method and algorithm based on wetting recognition are put forward. Good joint can be formed and destroy can be averted during laser soldering due to the solder joint qualification. Some defects are recognized and avoided in advance as well according to the analysis of the characteristics of the infrared signals.

Key words: Infrared radiation, Laser soldering, Quality control, Wetting recognition