304不锈钢薄板激光焊接工艺研究  

Study on Laser Welding of 304 Stainless Steel Sheet

作　　者：卢兵兵 LU Bingbing(Shanghai Hydrogen Propulsion Technology Co.,Ltd.,Shanghai 201800,China)

机构地区：[1]上海捷氢科技有限公司,上海每201800

出　　处：《热加工工艺》2023年第5期145-149,共5页Hot Working Technology

摘　　要：采用光纤激光器对1 mm厚的304不锈钢薄板进行焊接,分析了不同的激光焊接工艺参数对焊缝成形的影响规律,并利用光学显微镜、电子背散射衍射仪及万能材料试验机等设备对焊缝的显微组织、生长取向、力学性能进行分析和评定。结果表明,焊接速度、激光功率、光束离焦量均对1 mm厚304不锈钢薄板的焊缝成形产生明显影响,采用高的焊接速度、较大的光束离焦量和适中的激光功率有利于得到较好的焊缝成形,最终优化的激光功率为100 W,焊接速度为6 m/min,光束离焦量为±10 mm。焊缝沿着<100>方向呈现柱状生长,主要由奥氏体γ和未完全转化的δ铁素体组成。离焦量为10、-10 mm时,接头具有较高的抗拉强度和伸长率,断裂位置在母材。The fiber laser was used to weld 1mm thick 304 stainless steel sheet,and the influence of different laser welding process parameters on the weld formation was analyzed.The microstructure,growth orientation,and mechanical properties of the weld was analysed by using optical microscope,electron backscatter diffraction and universal material testing machine.The results show that the welding speed,laser power,and beam defocusing amount have a significant impact on the weld formation of 1 mm thick 304 stainless steel sheet.The use of high welding speed,large beam defocus amount and moderate laser power is beneficial to obtain better weld formation.The final optimized laser power is 100W,the welding speed is 6 m/min,and the beam defocusing amount is±10 mm.The weld shows a columnar growth along the 100 direction,which is mainly composed of austeniteγand incompletely transformedδferrite.When the defocusing amount is 10,-10 mm,the joint has higher tensile strength and elongation,and the fracture position is the base material.

关 键 词：光纤激光焊接 304不锈钢薄板 焊接速度 激光功率 离焦量 

分 类 号：TG456.7[金属学及工艺—焊接]