外加磁场对MIG焊熔滴过渡形式和焊缝组织性能的影响  

Effect of external magnetic field on metal transfer of MIG welding and its microstructure and properties of weld

作　　者：常云龙[1] 车小平[1] 李敬雅[1] 杨旭[1] 

机构地区：[1]沈阳工业大学,110023

出　　处：《焊接》2008年第10期25-28,共4页Welding & Joining

基　　金：辽宁自然科学基金资助(20051039);沈阳市重点基金资助(1071201-1-00)

摘　　要：利用Phtron512×512高速摄像机拍摄M IG焊熔滴过渡的方法,研究了纵向磁场脉冲M IG焊接铝合金熔滴过渡形式变化的规律和原因。熔滴过渡不仅与焊接电流、电弧电压有关,而且外加纵向磁场的电流和磁场频率也显著影响熔滴过渡方式。在焊接电流大于临界电流值时,通过改变外加磁场的电流和频率可以获得喷射过渡和旋转过渡。激磁电流和磁场频率需要恰当匹配,而且还必须与焊接参数相适应,才能保证获得稳定的熔滴过渡形式和最佳的晶粒细化效果。试验结果表明,焊缝金属的抗拉强度、断后伸长率及焊接接头的冲击吸收能量得到显著提高,改善了焊缝的接头强度和塑性。The metal transfer in MIG(metal inert-gas) welding of Al alloy with external intermittent and alternative longitudinal magnetic field was studied by high speed camera.The metal transfer was affected by welding current and arc voltage,and the electric current and frequency of external intermittent and alternative longitudinal magnetic field have great influence on the metal transfer.The exciting current and magnet field frequency need to be properly matched and they must to match with welding parameters,which ensure the stable metal transfer and the best grain refining effect.With the use of external magnetic field,the tensile strength,elongation and impact Absorbed energy of the weld are greatly increased,and the strength and plasticity of the weld were improved.

关 键 词：熔滴过渡 纵向磁场 晶粒细化 

分 类 号：TG442[金属学及工艺—焊接]