T型接头激光穿透焊焊接变形及残余应力研究  

Study of welding deformation and residual stresses in T-joint laser welding

作　　者：宋晟 李冰雪 万斌 陆皓[2] SONG Sheng;LI Bingxue;WAN Bin;LU Hao(Aviation Manufacturing Department,Shanghai Civil Aviation College,Shanghai 200232,China;School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China)

机构地区：[1]上海民航职业技术学院航空制造系,上海200232 [2]上海交通大学材料科学与工程学院,上海200240

出　　处：《电焊机》2018年第10期54-60,共7页Electric Welding Machine

基　　金：晨光计划(15CGB23)

摘　　要：三明治板结构简单、质量较轻、强度较高,在船舶行业具有广阔的应用前景,而采用高功率激光穿透焊来制造钢结构三明治板已成为三明治结构钢板的首选。T型接头是三明治结构基本的焊接单元,搭建了基于激光焊接的T型接头焊接平台,在试验基础上,提出了混合热源模型,准确描述了激光焊接过程中的热流分布状态。通过激光焊接试验和有限元仿真,分析三明治结构的焊接变形和残余应力分布,并探讨T型接头激光穿透焊焊接变形和残余应力的影响因素。结果发现,采用激光焊接能够显著减小焊接变形,但不能有效降低残余应力。As the sandwich panel structure is simple and relatively lighter with considerable strength, it has great application prospectin the shipbuilding industry. Using the laser welding to fabricate the steel sandwich panel is the preferred manufacturing technology.As the T-joint structure is the base welding unit of the sandwich structure, this paper has set up a T-joint welding platform based onlaser welding. On the basis of the experimental results, a new mixed heat source model was proposed. The heat flux distributionduring laser welding could be accurately described by the mixed heat source model. Through laser welding experiment and FEMcalculation, the welding deformation and residual stresses of the sandwich structure were analyzed. Besides, the influence factors onthe welding deformation and residual stresses were also discussed, finding that the welding deformation was significantly decreased byusing laser welding, but the residual stress was still at high level.

关 键 词：三明治结构 激光焊接 有限元仿真 残余应力 

分 类 号：TG456.7[金属学及工艺—焊接]