The comparison of multi-layer narrow-gap laser and arc welding of S32101 duplex stainless steel  

作　　者：Li Junzhao Wen Kai Sun Qingjie Liu Yibo Kong Bin Zeng Xianshan 李军兆;温凯;孙清洁;刘一搏;孔玢;曾宪山(HuNan Xiangtou Goldsky New Materials Co.,LTD,Yiyang 413000,China;Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai 264209,China;Hunan Xiangtou Goldsky Titanium Metal Co.,LTD.,Changsha 410205,China)

机构地区：[1]HuNan Xiangtou Goldsky New Materials Co.,LTD,Yiyang 413000,China [2]Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai 264209,China [3]Hunan Xiangtou Goldsky Titanium Metal Co.,LTD.,Changsha 410205,China

出　　处：《China Welding》2022年第4期37-47,共11页中国焊接（英文版）

基　　金：supported by the Science and Technology Innovation Program of Hunan Province(2022RC1060 and 2022GK4046)。

摘　　要：Multi-layer narrow-gap welding of thick S32101 duplex stainless steel was conducted using laser welding with beam wobble process.The phase transition,grain size,phase proportion and crystal texture of welded joint were also studied and compared with gas metal arc welding process.The microhardness and tensile strength were measured and fracture surface was analyzed to evaluate the mechanical properties of welded joints.The results showed that beam wobble technology improved the misalignment of laser beam and filler wire in narrow groove and helped to avoid incomplete fusion defects.Compared to arc welding process,the groove size and heat input were reduced,while welding efficiency was increased.The faster cooling rate and lower temperature gradient of laser wobble welding favored grain refinement,while the austenite content in weld zone decreased.Both the beam wobble and swing arc were conducive to stir weld pool,optimizing the weld microstructure and joint formation.The microstructural variance in various weld passes was caused by the heat input and heat dissipation ability.The microhardness of laser welded joint was lower,while the tensile strength and elongation percentage were higher.The fracture surface of arc welded joint was featured with shallower dimples and cleavage steps.

关 键 词：narrow gap welding laser welding gas metal arc welding duplex stainless steel mechanical properties 

分 类 号：TG457.11[金属学及工艺—焊接]