T型接头旋转激光+GMAW复合焊熔池动态行为数值分析模型  

Numerical Analysis Model for Dynamic Behavior of Molten Pool in Rotating Laser+GMAW Hybrid Welding of T Joints

作　　者：王艺瑾 刘文[1] 胥国祥[1] 朱杰[1] 胡庆贤[1] 杜宝帅 龚祺龙 WANG Yijin;LIU Wen;XU Guoxiang;ZHU Jie;HU Qingxian;DU Baoshuai;GONG Qilong(Key Laboratory of Advanced Welding Technology,Jiangsu University of Science and Technology,Jiangsu Zhenjiang 212000,China;State Grid Shandong Electric Power Research Institute,Jinan 250002,China)

机构地区：[1]江苏科技大学江苏省先进焊接技术重点实验室,江苏镇江212000 [2]国网山东省电力公司电力科学研究院,济南250002

出　　处：《精密成形工程》2024年第4期147-154,共8页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51975263,52375340)。

摘　　要：目的研究T型接头旋转光纤激光+GMAW复合焊熔池的温度场和流态特征,揭示气孔缺陷的产生及抑制机理。方法依据光学、电磁学、传热学及流体动力学机理,建立T型接头旋转光纤激光+GMAW复合焊熔池数值分析模型。使用Fluent软件对旋转频率分别为50 Hz和100 Hz的T型接头旋转激光+GMAW复合焊进行温度场以及流态特征的模拟,对比不同频率下T型接头横、纵截面,从工艺和焊缝成形角度出发,针对不同频率对熔池、小孔成形以及气孔抑制的影响进行讨论。结果当旋转频率为50 Hz时,纵截面内小孔最大深度为5.4 mm,横截面熔池内小孔开口直径相对较大,旋转一周后,小孔远离气泡,气泡无法逸出,形成气孔;当旋转频率为100 Hz时,纵截面内小孔深度显著降低,熔池体积明显减小,横截面内小孔最大开口直径和深度均降低,熔池尺寸也有所减小,在时间为0.097 s时,小孔上方区域出现的顺时针涡流不仅能抑制气孔,还能改善熔池的下垂以及立板焊趾处的咬边。结论随着旋转频率的增大,小孔的最大开口直径和深度均降低,还对熔池具有搅拌作用,使熔池体积变小。The work aims to study the temperature field and flow characteristics of molten pool in rotating laser+GMAW hybrid welding of T-joints,to reveal the generation and inhibition mechanisms of pore defects.According to the optics,electromagnetic,heat transfer and fluid dynamics mechanisms,a numerical analysis model of molten pool in rotating laser+GMAW hybrid welding of T-joints was established.The temperature field and flow characteristics of the T-joint rotating laser+GMAW hybrid welding at rotation frequencies of 50 Hz and 100 Hz were simulated by Fluent software.Then,the screenshots of cross and longitudinal sections of the joints were compared.From the perspective of process optimization and seam forming,the effect of different rotation frequencies on the molten pool and keyholes and the inhibition mechanism of pore was discussed.When the rotation frequency was 50 Hz,the maximum depth of keyhole in the longitudinal section was 5.4 mm.The opening diameter of the keyhole in the cross section was relatively large.After rotation for a cycle,the keyhole was far away from the bubble and the bubble could not overflow,forming the pore.When the rotation frequency was 100 Hz,the depth of keyhole in the longitudinal section was significantly reduced just as the volume of the molten pool.In the cross section,the maximum opening diameter and the depth of keyhole were reduced respectively just as the size of the molten pool.When the time was 0.097 s,the clockwise vortex in the area above the keyhole was conducive to reducing the sagging phenomenon in the molten pool and the undercut phenomenon at the weld toe of the vertical plate,inhibiting the pore.With the increase of rotation frequency,the maximum opening diameter and depth of the keyhole decrease,which has a stirring effect on the molten pool,making the volume of molten pool smaller.

关 键 词：T型接头旋转激光+GMAW焊 数值分析 旋转频率 小孔 气孔 

分 类 号：TG456.7[金属学及工艺—焊接]