磁场和活性焊联合作用对焊接熔池形态的影响

发布时间：2018-02-03 17:16

本文关键词： 电磁力表面张力温度场分布速度场分布　出处：《焊接学报》2017年08期 　论文类型：期刊论文

【摘要】：为了研究磁场和活性焊联合作用对焊接熔池中液态金属流动形态的影响,文中建立了移动热源作用下镁合金TIG焊三维瞬态数学模型.利用fluent软件及其二次开发功能,模拟了单独磁场、单独活性焊和两者联合作用对焊接熔池温度场和速度场的影响.模拟结果表明,在单独磁场作用下,熔池中液态金属呈顺时针定向旋转运动,速度场呈不对称双峰分布,最大速度偏向熔池一侧;在单独活性焊作用下,熔池中液态金属形成由外向内的对流模式,从而冲刷熔池底部增加熔深;在两者联合作用下流体流动较为复杂,熔池表面附近液态金属流动主要受表面张力的影响,熔池内部主要受外加电磁力的影响.
[Abstract]:In order to study the effect of the combination of magnetic field and active welding on the flow pattern of liquid metal in the weld pool, a three-dimensional transient mathematical model of magnesium alloy TIG welding under the action of moving heat source was established. The fluent software and its secondary development function were used. The effects of single magnetic field, single active welding and combined action of both on the temperature field and velocity field of weld pool are simulated. The simulation results show that the liquid metal in the molten pool rotates clockwise under the action of single magnetic field. Under the action of single active welding, the liquid metal in the molten pool forms a convection model from the outside to the inside, which increases the penetration depth at the bottom of the molten pool, and the velocity field is asymmetrical and bimodal distribution, and the maximum velocity is inclined to one side of the molten pool. The flow of liquid metal near the surface of the molten pool is mainly affected by the surface tension, and the internal flow of the molten pool is mainly affected by the external electromagnetic force.
【作者单位】：沈阳工业大学材料科学与工程学院;
【分类号】：TG40
【正文快照】： 0序言钨极氩弧焊采用惰性气体作为保护气,具有焊接质量好、焊缝成形美观、焊后变形小等优点,是镁合金焊接采用的重要方法,但由于钨极氩弧焊的单道熔深浅、焊接效率低,限制了其广泛应用[1].苏允海等人[2]将外加纵向磁场和活性剂同时引入到镁合金焊接过程中,并通过试验证明了此

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