局部干法横焊熔池温度场与流场的数值模拟  

Numerical Simulation of Temperature and Flow Fields of Weld Pool during Local Dry Horizontal Welding

作　　者：吴东[1] 高延峰[1] 黄林然 WU Dong;GAO Yanfeng;HUANG Linran(School of Aeronautic Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《热加工工艺》2018年第23期173-177,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51465043)

摘　　要：电弧在局部干法条件下,其形态、热量分布和工件的散热条件均发生了显著改变,本文建立了局部干法条件下横向焊接热源模型,综合考虑了电磁力、熔滴冲击力、表面张力、电弧压力、浮力等外界作用,对局部干法条件下不同水深的横焊熔池温度场和流场进行了数值模拟。模拟结果表明,在熔池的上部,铁水由熔池中心向熔池边缘流动,铁水向上的流动速度小于向下的流动速度,造成电弧上方熔宽小,下方熔宽大,熔池的流场和温度场在焊缝的横截面上不对称。随着水深的增加(<100m),温度降低,熔深先减小后增加,横焊熔池下塌现象也先缓解后变严重。Under local dry conditions, the shape, heat distribution of the arc and cooling conditions of the workpiece all change significantly. The horizontal welding heat source model under the local dry conditions was established, considering the electromagnetic force, droplet impact, surface tension, arc pressure and buoyancy. The temperature field and flow field of transverse welding pool with different water depths under local dry conditions were numerically simulated. The simulation results show that in the upper part of the molten pool, the molten iron flows from the center to the edge of the molten pool and the flow velocity of molten iron in upward direction is smaller that in downward direction, which causes small upper weld width and big lower weld width. The flow field and the temperature field of the molten pool are asymmetric in the cross section of the weld. With the increase of water depth(<100 m), the temperature decreases, the penetration decreases firstly then increases, the collapse phenomenon of the molten pool is alleviated firstly and then become serious.

关 键 词：局部干法 横焊 温度场 流场 数值模拟 

分 类 号：TG456.5[金属学及工艺—焊接]