交流脉冲TIG焊波成形过程数值分析  

Numerical Analysis of Ripple Formation Process During Pulsed TIG Welding

作　　者：赵光喜 程祥[1] 杨先海[1] 郑光明[1] 刘焕宝 谭帅[2] Zhao Guangxi;Cheng Xiang;Yang Xianhai;Zheng Guangming;Liu Huanbao;Tan Shuai(School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China;Shengli Oilfield Highland Petroleum Equpiment Co.,Ltd,Dongying 257091,China;Shandong Provincial Key Laboratory of Precision Manufacturing and Non-traditional Machining,Zibo 255000,China)

机构地区：[1]山东理工大学机械工程学院,山东淄博255000 [2]胜利油田高原石油装备有限责任公司,山东东营257091 [3]山东省精密制造与特种加工重点实验室,山东淄博255000

出　　处：《稀有金属材料与工程》2023年第1期133-138,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(52075306)。

摘　　要：考虑到电弧驱动力的影响,建立了在交流脉冲钨惰性气体(TIG)焊过程中焊波成形的三维瞬态数值分析模型。为避免焊丝熔化成熔滴后对电弧熔池表面波动的影响,当电弧在2024铝合金基板上扫描时,送丝机不送丝。结果表明,当电流在基值与峰值之间切换时,熔池表面呈周期性的波动,且随着电弧的移动,熔池后沿逐渐凝固。在大温度梯度下冷却的熔池表面在恢复平整前就已经凝固,从而形成焊波。焊波形成频率与电流脉冲频率相同,且相邻焊波间距约等于电弧扫描速度与电流脉冲频率的乘积。With the consideration of the influence of arc driving forces,a 3D transient numerical model was established for the ripple formation process during pulsed tungsten inert gas(TIG)welding.To avoid the influence of droplet caused by the melting of welding wire on the surface fluctuation of molten pool,the wire-feeding process did not proceed when the arc was scanning the 2024 aluminum alloy substrate.Results show that the molten pool surface fluctuates periodically when the current is switched between the base value and the peak value.With the arc movement,the rear side of molten pool is solidified gradually.The molten pool surface is solidified before flattening under the cooling with large temperature gradient,resulting in the welding ripples.The formation frequency of the welding ripples is equal to the current pulse frequency.The distance between adjacent welding ripples is approximately equal to the product of the arc scanning velocity and the current pulse frequency.

关 键 词：焊波形成 TIG焊 熔池 电弧驱动力 

分 类 号：TG444.74[金属学及工艺—焊接]