采用150 W光纤准连续激光器对厚度为0.2 mm不锈钢进行焊接, 通过正交实验对激光焊接工艺参数优化, 达到传感器不锈钢外壳封装的强度和密封性要求。对焊接接头进行抗拉强度、焊缝内部结构测试。测试结果表明, 影响焊缝强度的主要参数为脉冲宽度, 其次为激光峰值功率, 最大抗拉强度为434 MPa; 焊缝中未出现气孔及裂纹; 对实际产品传感器外壳进行焊接并进行密封性测试, 满足在5个大气压条件下不漏气的要求。

The quasi continuous wave laser of 150 watt was used to weld stainless steel with 0.2 mm thickness. Through orthogonal experiment of laser welding process parameters, the tensile strength and sealed of welds met the requires. Tensile strength testing, inner structures analysis, hardness test were carried on the welded joint. The test results show that the main parameters on tensile strength are pulse width, followed by peak laser power. The maximal tensile strength reached 434 MPa. No pores and crack appeared in welds, microhardness was HV 254-256, which was bigger than the base metal. The sensor shells were welded and sealed character was tested, the test result showed that the sealed welds met the requires of 5 atmospheres.