316L不锈钢薄板激光焊接接头微观组织及力学性能研究  

Study on Microstructure and Mechanical Properties of Laser Welded Joints of 316L Stainless Steel Sheet

作　　者：聂宇 冯巧波 王春亮 王杰 NIE Yu;FENG Qiaobo;WANG Chunliang;WANG Jie(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 201306,China;Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海201306 [2]上海电力大学上海市电力材料防护与新材料重点实验室,上海200090

出　　处：《热加工工艺》2024年第24期80-84,共5页Hot Working Technology

基　　金：国家自然科学基金面上项目(52175343)。

摘　　要：采用脉冲激光焊接设备对0.3 mm厚的316L不锈钢薄板进行搭接焊接试验,分析了工艺参数对焊缝特征及力学性能的影响。结果表明:通过正交试验,在激光峰值功率为2.6 kW、焊接速度为8 mm/s、离焦量为+1.0 mm的最优焊接工艺参数下,焊接接头抗剪切应力最大,离焦量对焊接接头的抗剪切应力影响最大。焊缝横截面存在多个焊点的重叠区,在熔合线附近未观察到明显的热影响区,柱状晶近似垂直熔合线且向焊缝中心点集中生长。焊缝区比母材的硬度小,且从焊缝中心到两端熔合线逐渐增大;在横截面垂直方向上,随着焊缝深度的增加,硬度增大。The lap welding test of 316L stainless steel sheet with thickness of 0.3 mm was carried out by pulse laser welding equipment,and the influence of process parameters on the weld characteristics and mechanical properties was analyzed.The results show that through orthogonal test,under the optimal welding process parameters of laser peak power of 2.6 kW,welding speed of 8 mm/s and defocusing amount of+1.0 mm,the shear stress of the welded joints is largest,and the defocusing amount has the greatest influence on the shear stress of welded joints.There are overlapping areas of multiple solder joints in the cross section of the weld.No obvious heat affected zone is observed near the fusion line.The columnar crystals are approximately perpendicular to the fusion line and grow towards the center of the weld.The hardness of the weld zone is smaller than that of the base metal,and gradually increases from the weld center to the fusion line at both ends.In the vertical direction of the cross section,the hardness increases with the increase of the weld depth.

关 键 词：316L不锈钢薄板 激光搭接焊接 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]