摘要
具有稳定熔滴过渡过程的单丝大电流GMAW(熔化极气体保护焊)焊接方法拥有其他高效GMAW焊接方法不可取代的优势.通过采集大电流GMAW的熔滴过渡高速摄像和焊接电流电压信号,对比分析了大电流MIG(熔化极惰性气体保护焊)和MAG(熔化极活性气体保护焊)焊接过程中不同的熔滴过渡行为,分析了焊接电流和保护气体成分对熔滴过渡频率的影响.结果表明:大电流MIG焊接熔滴过渡形式为单一的旋转射流过渡,且旋转频率随着焊接电流的增大先减小后增大;大电流MAG焊接熔滴过渡形式为摆动和旋转射流混合过渡,且摆动过渡频率会因为液流束与熔池接触短路而增大;外加磁场能够改变大电流GMAW液流束和电弧的旋转方向,减小旋转角度,这一发现为400A以上稳定单丝高效GMAW焊接工艺的研发提供了新思路.
Single wire high-current GMAW welding methods with steady metal transfer processes has irreplaceable advantages over other high-efficiency GMAW welding methods.Based on the high-speed photography and electric signals selecting technology in metal transfer process of GMAW,the differences between MIG and MAG welding were discussed,and the impacts of current or shielding gas constitution on transfer frequency were highlighted.The results indicate that metal transfer style of high-current MIG welding is rotating spray transfer,and the rotating frequency of MIG welding decrease at first and then increase with the increase of welding current;while in the MAG welding,it becomes a mixing rotating and swing transfer style,and the rotating frequency or swing frequency increases when the flow beam contacts with the weld pool in high current condition.In addition,the external magnetic field can change the rotation direction of large current GMAW flow beam and arc,and reduce the rotation angle.This discovery provides a new idea for the research and development of high efficiency GMAW welding process with single wire over 400 A.
作者
肖磊
樊丁
郑发磊
黄健康
杨文艳
XIAO Lei;FAN Ding;ZHENG Falei;HUANG Jiankang;YANG Wenyan(School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Central Research Institute,Zoomlion Limited Liability Company,Changsha 410000,Hunan,China)
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第4期127-131,137,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(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)~~
关键词
熔化极气体保护焊
熔滴过渡
旋转射流过渡
摆动过渡
高速摄像
gas metal arc welding
droplet transfer
rotating spray transfer
swing transfer
high-speed photography
