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高频交变磁场对大电流GMAW熔滴过渡和飞溅率的影响
樊丁1,2, 杨文艳1, 肖磊1, 黄健康1,2
1.兰州理工大学 材料科学与工程学院, 兰州 730050;2.兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050
摘要:
在熔化极气体保护焊过程中,采用大送丝速度,增大焊接电流和焊丝伸出长度是提高焊接熔敷率的直接途径.但当熔滴过渡转变为旋转射流过渡时,电弧不稳,飞溅增大,焊缝成形变差.施加不同频率的纵向交变磁场,对焊缝成形进行控制.采用高速摄像技术,拍摄焊接过程中的电弧形态和熔滴过渡,研究不同频率的磁场对熔滴过渡和焊接飞溅率的影响规律.结果表明,熔滴过渡形式不同,产生飞溅的机理不同;外加频率为1 000 Hz纵向交变磁场时,电弧的旋转半径减小,电弧的挺度增大,旋转射流过渡时电弧更稳定,焊接飞溅率降低,焊缝成形改善.
关键词:  旋转射流过渡  高频磁场  高速摄像  飞溅率  蒸发速率
DOI:10.12073/j.hjxb.2019400172
分类号:TG442
基金项目:国家自然科学基金项目(51775256);甘肃省基础研究创新群体计划项目(17JR5RA107);甘肃省高校协同创新团队项目(2017C-07)
Effect of high frequency longitudinal alternating magnetic field on droplet transfer and spatter rate in high current GMAW welding
FAN Ding1,2, YANG Wenyan1, XIAO Lei1, HUANG Jiankang1,2
1.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;2.State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
Abstract:
In the process of gas shielded arc welding (GMAW), it is a direct way to increase the welding deposit rate by adopting high wire feeding speed, increasing welding current and dry elongation. However, when the droplet transfer is changed into rotating jet transfer, the arc is unstable, the spatter increases and the weld formation becomes worse. A longitudinal alternating magnetic field with different frequencies is applied to control the weld formation. The arc shape and droplet transfer during welding were photographed by high-speed video camera. The effects of magnetic field with different frequencies on droplet transfer and welding spatter rate were studied. The results show that the mechanism of spatter is different with different droplet transfer modes; when the applied frequency is 1 000 Hz longitudinal alternating magnetic field, the rotating radius of arc decreases, the stiffness of arc increases, the arc is more stable, the welding spatter rate decreases, and the weld shape is improved.
Key words:  swirling jet transition  high frequency magnetic field  high speed photography  spatter rate  evaporation rate