脉冲激光焊接对超薄Hastelloy C-276焊缝成形的影响  

Weld Joint Forming of Thin Hastelloy C-276 Sheet of Pulsed Laser Welding

作　　者：马广义[1] 吴东江[1] 王占宏[1] 郭玉泉[1] 郭东明[1] 

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,辽宁大连116024

出　　处：《中国激光》2011年第6期161-165,共5页Chinese Journal of Lasers

基　　金：国家973计划(2009CB724307)资助课题

摘　　要：基于0.5 mm厚度Hastelloy C-276合金,开展了脉冲激光焊接实验。结合焊接熔池的浮力效应和Marangoni对流,研究了脉冲宽度、单脉冲能量、脉冲频率和焊接速度对焊缝形成规律的影响。实验表明,单脉冲能量和焊接速度对熔池流动机制的影响相似,适当的参数条件下可以改变Marangoni对流和浮力效应的强弱趋势;而脉冲宽度直接决定了对流机制的形成条件,对焊缝的形成影响显著;脉冲频率的改变决定了相对热作用时间,影响了熔池对流条件,进而影响焊缝形貌特征。The pulsed laser welding experiment of Hastelloy C-276 of 0.5 mm thickness is conducted.According to buoyancy force and Marangoni convection,the influences of pulse duration,pulse energy,pulse repetition rate and welding velocity on weld joint are investigated.It is indicated that the pulse energy and welding velocity present the same impact on the forming of weld joint,and suitable parameters can affect the interaction between buoyancy effect and Marangoni convection.The pulse duration can decide the pool liquid flow,and further significantly impact the forming of weld joint.In addition,the variation of repetition rate determines the relative thermal action and impacts the pool flow,and finally varies the weld joint.

关 键 词：激光应用 HASTELLOY C-276 脉冲激光焊接 浮力效应 Marangoni对流 焊缝形貌 

分 类 号：TG456.7[金属学及工艺—焊接]