采用Nd∶YAG激光对井下作业光纤传感器的SUS304不锈钢外壳进行了焊接。为改进传感器不锈钢外壳封装工艺，满足井下作业环境对传感器不锈钢外壳较高的强度和较好密封性要求，采用正交实验设计方法优化了激光焊接的工艺参数并比较了优化效果。优化的激光焊接参数为电流180A，脉宽3ms，频率30Hz，扫描速度10mm/s。对焊接接头进行了拉伸强度测试、断口分析、金相组织分析、显微硬度分析。结果表明：优化参数的焊接试样质量明显好于未优化参数的试样，其抗拉强度为767.5N/mm2，达到基材抗拉强度的96％，拉伸断裂机制为韧性断裂；焊缝组织没有出现气孔、裂纹等缺陷；焊缝硬度与基材相当，硬度范围为HV0.3230～250。

The SUS 304 stainless steel shell of undergroud fiberoptic sensor was welded with Nd∶YAG laser. In order to improve the packaging technology of sensor and meet the high strength and tightness requirements of the stainless steel shell, the weld process parameters were optimized by the means of orthogonal experimental design and the results before optimization and after optimization were compared. Laser welding parameters has been optimized for the current of 180A, pulse width of 3ms, frequency of 30Hz, scanning speed of 10mm/s. Tensile testing, fracture analysis, microstructure analysis, hardness test were carried out on the welded joint. The results showed that optimized welding parameters of the sample quality are better than nonoptimized ones. Tensile strength of the specimen optimized parameter is 767.5N/mm2, up 96％ of base material tensile strength, tensile fracture mechanism is ductile fracture. The welded seam has no holes, cracks and other defects. The hardness of welded joints is HV0.3230～250 which is equivalent to the one of raw material.