摘要
针对外加各种磁场作用下的GMAW堆焊过程,开发了基于电弧简化模型的熔池电磁力工程化有限元计算方法.利用此方法,系统研究了无外加磁场、外加纵向磁场和横向磁场三种工况下熔池内电磁力的分布情况,并预测了电磁力对熔池对流的影响.结果表明,焊接自有磁场驱动了熔池中心收缩下沉流;外加纵向磁场导致周向搅拌流,形成电磁搅拌细化晶粒;外加横向磁场可以驱动熔池流动演变为"单涡"对流状态,有利于熔池接纳熔滴减少飞溅.基于模拟结果的预测与试验结果吻合,因此验证了所用计算方法的正确性.
A simulation method based on simplified arc model is developed for the analysis of GMAW deposition with various external magnetic fields. The electromagnetic force distributions in the workpiece produced by longitudinal and transversal magnetic fields are systematically investigated in comparison with the case without external field. The results reveal that the inherent electromagnetic force of GMAW welding drive the converging and sinking flow in the central of melt pool. The external longitudinal field results in circumferential electromagnetic force which stirs the melt pool,which in turn refine the microstructure. The external transversal field of specific direction could convert the melt convection into 'single-vortex'state which help the melt pool to absorb molten droplet and therefore reduce the spatter. The agreement between experimental data and the simulation results verifies the reliability and universality of the numerical model.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2016年第1期46-50,131,共5页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51175203
51374113
51505210)
关键词
熔池电磁力
简化电弧模型
外加磁场
electromagnetic force in melt pool
simplified arc model
external magnetic field
