激光拼焊差厚板焊缝断裂原因分析  

Cause for Fracturing of Welding Seam of Laser Tailor Welded Differentially Thick Plate

作　　者：蔡周彦 易寒 白佳鑫 刘腾轼 CAI Zhouyan;YI Han;BAI Jiaxin;LIU Tengshi(Zhejiang Institute of Advanced Material,Shanghai University,Jiashan Zhejiang 314100,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Technology Center,Hebei Longfengshan Casting Co.,Ltd.,Handan Hebei 056300,China)

机构地区：[1]上海大学(浙江)高端装备基础件材料研究院,浙江嘉善314100 [2]上海大学材料科学与工程学院,上海200444 [3]河北龙凤山铸业有限公司技术中心,河北邯郸056300

出　　处：《上海金属》2025年第1期36-41,共6页Shanghai Metals

基　　金：河北省重点研发计划(20311009D)。

摘　　要：为了确定激光拼焊差厚板焊缝断裂的原因,使用维氏硬度计、电子万能试验机、光学显微镜、扫描电子显微镜和能谱仪分析了激光拼焊后22MnB5钢的力学性能和显微组织,并对其失效模式及机制进行了分析。结果表明:在焊接过程中,Al-Si镀层熔化进入焊缝;随着焊缝中铝元素的富集,δ铁素体含量增加,降低了焊缝塑性,导致拉伸试样焊缝断裂。In order to determine the cause of fracturing in the weld of laser tailor welded differentially thick plate,the mechanical properties and microstructure of 22MnB5 steel after laser tailor welding were analyzed by Vickers hardness tester,electronic universal testing machine,optical microscope,scanning electron microscope and energy dispersive spectrometer,the modes and mechanisms of failure were also analyzed.The results showed that the Al-Si coating melted into the weld during the welding;with the enrichment of aluminium elements in the weld,the increase inδ-ferrite content reduced the plasticity of the weld,thus leading to the tensile specimen fracturing in the weld.

关 键 词：激光拼焊 Al-Si镀层 Δ铁素体 断裂 

分 类 号：TG441.3[金属学及工艺—焊接]