Q235钢薄板激光焊接头微观组织与力学性能  

Microstructure and mechanical properties of laser welded joint of Q235 steel sheet

作　　者：范霁康 战英扬 徐鸿林 张建[1] 宋友民 王克鸿[1] FAN Jikang;ZHAN Yingyang;XU Honglin;ZHANG Jian;SONG Youmin;WANG Kehong(Key Laboratory of Controlled Arc Intlligent Additive Technology,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu pro.,China;Kunshan Huaheng Welding Co.,Ltd.,Kunshan 215300,Jiangsu pro.,China)

机构地区：[1]南京理工大学受控电弧智能增材技术工业和信息化部重点实验室,江苏南京210094 [2]昆山华恒焊接股份有限公司,江苏东昆山215300

出　　处：《焊接技术》2023年第2期43-46,I0008,共5页Welding Technology

基　　金：国家自然科学基金(51805265,51805266);江苏省博士后科研资助计划(20190103);昆山头雁工程研发及产业化项目(KJJ20190007);昆山市重点研发计划项目(KJJ ZDYFKJZL2020003)。

摘　　要：为了探索光纤激光在焊接薄板低碳钢中的应用前景,文中采用光纤激光焊接系统分别对0.5 mm和1 mm厚Q235钢板进行了激光焊工艺试验,并对所得到的焊接接头的微观组织和力学性能进行了分析。通过调节激光功率、摆动频率等工艺参数,2种厚度的Q235钢板均可获得单面焊双面成形、无明显缺陷的焊接接头。厚0.5 mm板焊缝区主要由板条马氏体组成,硬度和抗拉强度均高于母材的,断后伸长率为33.1%,约为母材的79%;厚1 mm板焊缝区呈胞状树枝晶组织,主要由铁素体、珠光体和贝氏体组成,硬度和抗拉强度均高于母材的,断后伸长率为34.5%,约为母材的75%。In order to explore the application prospect of fiber laser welding in thin plate low carbon steel,the laser welding experiments of 0.5 mm and 1 mm Q235 thin plate with fiber laser welding system were carried out and the microstructure and mechanical properties of the welded joints were analyzed in this paper.By adjusting the process parameters such as laser power and swing frequency,the welded joints could obtain double side forming and no obvious defects with single side welding for Q235 steel sheets.The weld zone of 0.5 mm plate was mainly composed of lath martensite,the hardness and tensile strength of the weld zone were greater than the base metal,and the elongation after fracture was 33.1%,about 79%of the base metal.The microstructure of the weld zone of 1 mm plate was cellular dendrite,which was mainly composed of ferrite,pearlite and bainite.The hardness and tensile strength of the weld zone were greater than the base metal,and the elongation after fracture was 34.5%,about 75%of the base metal.

关 键 词：Q235钢薄板 激光焊 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接] TG407