三丝GMAW不同电流配比对焊缝成形的影响机理研究  

Research on Influnece Mechanism of Different Current Ratio on Formation of Weld Seam for Triple-wire GMAW

作　　者：顾煜[1] 华学明[1] 叶定剑[1] 李芳[1] 徐琛[1] 

机构地区：[1]上海交通大学上海市激光制造与材料改性重点试验室,上海200240

出　　处：《热加工工艺》2016年第9期171-175,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51275299)

摘　　要：三丝GMAW是一种有效提高焊接速度的焊接方法,但电流配比对最后的焊缝成形具有重要的影响,焊接工艺实验表明适当提高引导弧的电流有利于形成形态良好的焊缝。本文针对三丝电流配比对焊缝成形的影响,采用数值模拟方法,研究了不同电流配比对焊缝成形的影响机理,揭示了三丝GMAW不同电流配比下的熔池形态及流动场的不同分布规律。研究结果表明:适当提高引导弧的电流可形成互相连通、熔宽分布均匀的三丝GMAW共熔池,有利于形成明显的"推-拉"流动方式,减缓熔池的后退效应,降低凝固速度,增强焊接过程的稳定性,有利于形成均匀一致的焊缝。Triple-wire GMAW is an effective weld method to improve the welding speed,but the current ratio has a significant effect on the final formation of the weld seam. The welding process experiments show that a good shape weld seam can be obtained by appropriately increasing the leading arc current. Aiming at the effect of triple-wire current ratio on the weld seam formation,using numerical simulation method, influence the mechanism of different current ratios on the formation of the weld seam was studied. The welding pool shape and distribution rule of flow field of triple-wire GMAW under different current ratio were revealed. The results show that it is beneficial for forming a triple-wire GMAW co-weld pool with interconnection and uniform-distributed weld width can be obtained by appropriately increasing the current of leading arc. Additionally, the ＂pull-push＂ flow way can be easily formed, which could slow down the backward effect of weld pool, reduce the solidification rate and increase the stability of welding process, and consequently, a uniform weld seam can be formed.

关 键 词：三丝GMAW 电流配比 熔池形态 流动场 

分 类 号：TG444.7[金属学及工艺—焊接]