摘要
采用窄间隙激光填丝焊焊接了16 mm厚的Q345E钢,利用光学显微镜和拉伸试验机等分析了接头的组织和力学性能。结果表明：在选取合适的焊接工艺参数的情况下,可以得到成型良好,无气孔、裂纹和未熔合的窄间隙接头。焊接道数共5道,接头的中部焊缝组织主要为针状铁素体、粒状贝氏体和珠光体,接头的中部热影响区组织为回火马氏体和M-A组织;接头的表层焊缝组织和中部焊缝组织一致,但其组织粗大,接头的表层热影响区组织为板条状马氏体。接头表层热影响区的硬度高于接头中部热影响区的硬度。拉伸试样均断在母材,横向侧弯试样在弯曲180°后均未开裂,接头力学性能良好。
16 mm thick Q345 E steel was welded by using narrow-gap laser welding with filler wire. The optical microscope and tensile testing machine, etc were used to test the microstructure and mechanical properties of the joint. The results show that the well formed narrow gap joint without porosity, crack and incomplete fusion can be obtained under optimized welding parameters. The joint is composed of five weld beads. The weld structure in the middle part of the joint is mainly acicular ferrite, granular bainite and pearlite and the heat affected zone structure is tempered martensite and M-A structure. The weld structure on surface of the joint is the same as that of the middle part of the joint, but the microstructure is coarse. The heat affected zone structure on surface of the joint is lath martensite. The hardness of heat affected zone on the joint surface is higher than that of the heat affected zone in the middle part of the joint. The tensile samples break in the base metal. The lateral bending specimens are not cracked after bending 180° and the mechanical properties of the joint are good.
作者
阚晓阳
汪认
叶结和
王程昊
顾伟
赵勇
KAN Xiaoyang;WANG Ren;YE Jiehe;WANG Chenghao;GU Wei;ZHAO Yong(China Railway Rolling Stock Coporation Qingdao Sifang Co. ,Ltd. ,Qingdao 266111, China;Provincial Key Lab Advanced Welding Technology, Jiangsu University of Science and Technology, Zhenjiang 213003, China)
出处
《热加工工艺》
CSCD
北大核心
2018年第7期244-246,251,共4页
Hot Working Technology
关键词
窄间隙
激光填丝焊
微观组织
力学性能
narrow gap
laser welding with filler welding
microstructure
mechanical properties
