厚板高强钢激光填丝多层焊接头特征及断裂机制研究  

Characteristics and fracture mechanism of joint obtained by laser multi-layer welding with filler wire on thick plate

作　　者：尹杰[1,2] 李俐群[1] 冯杰才[1] 

机构地区：[1]哈尔滨工业大学现代焊接与连接技术国家重点实验室,哈尔滨15001 [2]山推工程机械股份有限公司,山东济宁272073

出　　处：《材料科学与工艺》2013年第1期138-143,共6页Materials Science and Technology

摘　　要：本文在11CrNi3MnMoV低合金高强钢激光填丝多层焊工艺优化的基础上利用电子万能试验机、HVS-5维氏硬度计、扫描电子显微镜和能谱分析仪等对焊缝接头进行了力学性能测试,并重点对断裂机制进行了分析.结果发现:激光填丝焊接头的HAZ很窄,约为1 mm.焊缝平均硬度值高出母材30%左右;顶层焊道硬度高于内层焊道;最高硬度值出现在熔合区附近;接头断裂机制为韧窝断裂;能谱分析发现韧窝中第二相粒子成分主要由母材和焊缝的合金元素决定.焊缝金属与母材界面处存在一层Fe、Mn等合金元素的氧化物,其导致侧壁未熔合,这是接头断裂的主要原因.In the present work,the welding joint mechanical properties test and fracture characteristic analysis are completed by using Material Testing Machine,HVS-5 vickers hardness tester,scanning electron microscope and energy spectrum analyzer based on optimization of laser multi-layer welding with filler wire of 11CrNi3MnMoV steel.The results indicate that the joint HAZ of laser welding with filler wire is very narrow,approximately 1mm.The average hardness value of Joint is 30% higher than that of the parent metal;the hardness value of inner layer passes is higher than the last layer;and the highest hardness value appears in the fusion area nearby;the joint fracture mechanism is dimple fracture.Energy spectrum analysis shows that the composition of the second phase particles is mainly decided by the parent metal and weld joint＇s alloy element.Between the Weld metal and the sidewalls of the groove of patent metal,there is a layer of the oxides of alloy elements such as Fe,Mn,that causes incomplete fusion on the wall,which is the main causes of joint fracture.

关 键 词：激光填丝焊 接头断裂机制 能谱分析 第二相粒子 

分 类 号：TG456.8[金属学及工艺—焊接]