外加纵向磁场作用下的MIG焊电弧形态  

Research on MIG welding arc with additional longitudinal alternating magnetic field

作　　者：常云龙[1] 邵礼光[1] 李多[1] 李大用[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110023

出　　处：《焊接技术》2009年第5期14-16,共3页Welding Technology

摘　　要：利用高速摄像装置拍摄外加纵向磁场作用下的MIG焊接电弧,对电弧形态的变化进行研究。通过电弧照片可以明显看出,在外加间歇交变纵向磁场的作用下,MIG焊接电弧沿着焊丝轴向发生逆时针和顺时针交替变化的旋转运动。磁场频率一定时,随着激磁电流的增大电弧扩张、亮度变小、电弧电流减小;激磁电流一定时,随着磁场频率的增大,焊接电弧旋转频率变大。在外加纵向磁场作用下,熔滴形态发生椭球形变化,焊接电弧随着熔滴形态的变化而改变。激磁电流为0.5～0.8 A时,随着激磁电流的增大,焊接电流衰减幅度较大;激磁电流为0.8～1.5 A时,随着激磁电流的增大,焊接电流衰减幅度减小,逐渐趋于平缓。A high-speed video camera was used to acquire MIG welding arc shape with additional longitudinal alternating magnetic field. Variety of arc shape of welding was researched. A high-speed video camera showed that the MIG welding arc shape clockwise and counter clockwise moved along the welding wire axsis with additional longitudinal alternating magnetic field. When magnetic frequency was constant, the more the magnetic current was increased, the bigger the arc shape was and the darker the arc was. When magnetic current was constant, the more the magnetic frequency was increased, the more the arc shape rotating frequency was. The result also showed that the droplet shape was alternation with longitudinal alternating magnetic field. The arc shape was also changed with this droplet shape. When the magnetic current was changed from 0.5 A to 0.8 A, increasing magnetic current, the welding current had a heavily attenuation; when the magnetic current was from 0.8 A to 1.5 A, increasing magnetic current, the welding current had a gradual attenuation.

关 键 词：纵向磁场 MIG焊 高速摄像 旋转电弧 

分 类 号：TG444.74[金属学及工艺—焊接]