KM8不锈钢板式热沉激光焊接工艺研究

热沉是空间环境模拟器的重要组成部分之一,用于在真空热试验中产生冷黑环境。我国目前正在研制的KM8空间环境模拟器和KM7A空间环境模拟器的热沉均采用不锈钢板式结构,而不锈钢板式热沉的焊接加工工艺是亟需解决的技术问题。文章介绍了在KM8不锈钢板式热沉激光焊接工艺研究中,采用不同的工艺参数焊接了不同厚度的搭接组合板试件后,对这些试件进行了力学拉伸试验和焊缝分析与检测,并根据检测结果确定了不同厚度板材组合的最佳搭接焊接工艺参数。这些工艺参数在后续的生产实践得到了有效验证。

Laser welding of the KM8 stainless steel plate-style thermal shroud

The thermal shroud is an important subsystem of the space environment simulator, mainly used to provide a cold and dark environmental for the spacecraft thermal balance and thermal vacuum tests. The thermal shroud of the KM8 space environment simulator used for the space station thermal test and the KM7A space environment simulator used for the satellite test are all in stainless steel plate-style structures. For the manufacture of the two large stainless steel thermal shrouds, the urgent need is to solve the bottleneck problem related with the processing of the stainless steel plate-style thermal shrouds. This paper analyzes the laser welding process for the KM8 thermal shroud. Welding specimens of different combinations of plate thickness with different welding parameters are made, and mechanical tensile tests, weld analysis and detections are carried out. The optimum welding parameters of the combination of different thickness plates are then determined. The manufacture practice shows that the welding parameters obtained in this study are adequate.