316L不锈钢激光焊接头组织与性能研究  

Research on Microstructure and Properties of Laser Welded Joint of 316L Stainless Steel

作　　者：樊宇[1,2] 浦轲 顾洪飞 李建 黄鑫颖 杨晓燕 FAN Yu;PU Ke;GU Hongfei;LI Jian;HUANG Xinying;YANG Xiaoyan(Sohool of Materials Science and Engineering,China University of Mining and Technology,Xuzhou 221116,China;Nantong Tank Container Co.,Ltd.,Nantong 220371,China)

机构地区：[1]中国矿业大学材料科学与工程学院,江苏徐州221116 [2]南通四方罐式储运设备制造有限公司,江苏南通220371

出　　处：《热加工工艺》2020年第23期27-32,共6页Hot Working Technology

摘　　要：在激光功率为1350 W,焊接速度为0.8 m/min,离焦量为0 mm的工艺参数下对316L不锈钢板材进行对接焊,研究发现该条件下的焊缝凝固过程为F-A模式,室温下组织为奥氏体+蠕虫状铁素体。对焊接工艺参数对焊缝尺寸和力学性能的影响进行研究,发现激光功率和离焦量对熔深影响较大,而焊接速度则对熔宽和束腰宽影响较大。此外,在焊接热输入相同的前提下,激光焊接头的硬度、拉伸性能和耐腐蚀性均优于PAW+TIG复合焊接头的。The butt welding of 316 L stainless steel plate was carried out under laser power of 1350 W, welding speed of 0.8 m/min and defocusing quantity of 0 mm. It is found that the solidification process of the weld under this condition is F-A mode, and the microstructure is austenite+wormlike ferrite at room temperature. The effect of welding process parameters on size of weld seam and mechanical properties was studied. It is found that laser power and defocusing amount have greater influence on penetration, while welding speed has great influence on melting width and beam waist width. In addition, the hardness, tensile properties and corrosion resistance of welded joint by laser welding are better than those by PAW+TIG welding under the same heat input.

关 键 词：316L不锈钢 光纤激光焊接 凝固模式 力学性能 

分 类 号：TG457.1[金属学及工艺—焊接]