激光光束位置对水下激光焊接熔深和微观组织的影响  

Effect of Laser Beam Position on Microstructure and Weld Penetration of Underwater Laser Tailor-Welded Blank

作　　者：黄尊月 罗震[1,2] 敖三三[1] 姚杞 赵玉津 HUANG Zunyue LUO Zhen AO Sansan YAO Qi CHAO Yujin(School of Materials Science and Engineering, Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China Collaborative Innovation Center of Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China)

机构地区：[1]天津大学材料科学与工程学院,天津市现代连接技术重点实验室,天津300072 [2]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《上海交通大学学报》2016年第10期1609-1612,1617,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(51275342,51275338);国家自然科学青年基金项目(51405335);高等学校博士学科点专项科研基金项目(20130032110004)资助

摘　　要：采用局部干法水下激光焊接技术进行不同板厚(1.5和2.0mm)的拼接焊试验,研究了激光光束位置对于焊缝的有效熔深和焊缝组织的影响.结果表明:当激光光束位于居中位置时,所得焊缝的有效熔深最大,当激光光束位置偏向薄板时其值次之,当激光光束位置偏向厚板时其值最小,这与不同板厚之间的缝隙充当小孔而增加了光束能量吸收有关;不同激光光束位置的焊缝均由等轴晶和柱状晶组成,且等轴晶相对于板之间缝隙的位置不同而有所不同;焊缝组织均为奥氏体和铁素体.In order to investigate the effect of laser beam position on microstructure and weld penetration, two stainless steel AISI304 tailor blanks with different thicknesses （1.5 mm and 2.0 mm） were fabricated. The results show that the effective weld penetration is maximum when the laser beam is along the joint and is minimum when the laser beam moves 0.5 mm in the direction of the thicker plate. The reason for this is that the energy density of the laser beam and the micro-gap of the butt joint determine the effective weld penetration in underwater laser welding. The microstructures are equiaxed grain zone and columnar grain zone but the position of equiaxed grain zone is different. The mierostructures of underwater laser weld are austenite and a small amount of δ-Ferrite.

关 键 词：水下激光焊 熔深 微观组织 

分 类 号：TG456.7[金属学及工艺—焊接]