摘要
研究了厚度为0.1 mm的321不锈钢薄板的搭接脉冲激光焊工艺,采用正交试验法对焊接工艺进行优化,并对焊接接头的微观组织和力学性能进行了分析测试。结果表明,采用在最优工艺参数——焊接速度0.5 m/min,激光功率150 W,离焦量+2 mm时,焊接接头的剪切载荷最大,达到母材拉伸力的94%,焊缝区的显微硬度值高于母材的;金相组织观察显示,焊缝中心为细小的等轴晶,焊缝边缘为细小的柱状晶;接头剪切断口SEM分析表明,接头呈明显的韧性断裂特征。
The lap pulsed laser beam welding technology of ultra-thin stainless steel 321 with the thickness of 0.1 mm is investigated, and the welding parameters were optimized by orthogonal experiment. The microstructure and mechanical properties of welded joints were analyzed. The results showed that the optimized welding parameters were determined as the following, namely welding speed was 0.5 m/min, laser power was 150 W, defocusing amount was +2mm. The maximum shear load of welded joint could be got under this condition, and the shear load was about 94% of base metal, and the microhardness of weld metal was higher than that of base metal. The metallographic observation of joint indicated that the microstructure of weldment was composed of equiaxed grains in weld center and fine columnar was grained in weld edge. SEM observation of shear fracture showed that joint presents obviously the characteristic of ductile fracture.
出处
《焊接技术》
2017年第3期16-20,共5页
Welding Technology
基金
江苏高校优势学科建设工程资助项目
关键词
脉冲激光焊
超薄不锈钢
微观组织
力学性能
pulsed laser beam welding
ultra-thin stainless steel
microstructure
mechanical properties
