Modelling of binary alloy (Al–Mg) anode evaporation in arc welding

Modelling of binary alloy (Al–Mg) anode evaporation in arc welding
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电弧焊中二元合金 (AlâMg) 阳极蒸发的建模

DOI:
10.1088/0965-0393/20/5/055009
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发表时间:
2012
影响因子:
1.8
通讯作者:
A. Zabirov
A. Zabirov
中科院分区:
材料科学3区
文献类型:
--
作者:
I. Semenov;I. Krivtsun;V. Demchenko;A. Semenov;U. Reisgen;O. Mokrov;A. Zabirov

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提出了钨极气体保护焊和金属气体保护焊中二元合金阳极蒸发的简化分析模型。该模型包括对流和扩散区蒸发模型和阳极过程模型,并允许计算阳极表面附近多组分电弧等离子体的基本物理性质随阳极表面温度、阳极化学成分、电子温度和阳极表面电流密度的函数。在该模型的基础上,研究了不同镁质量分数的二元铝镁合金在Ar等离子体中的蒸发过程。给出了合金沸腾温度与镁质量分数和电子温度的关系。在较宽的阳极表面温度范围和不同的镁质量分数下,计算了从工艺角度看重要的几个物理参数(镁质量流量、蒸发热损失、阳极电位降、阳极热流密度)。此外,还讨论了蒸发热损失对进入阳极表面的总热流的影响。
A simple analytical model of binary alloy anode evaporation in gas–tungsten arc and gas–metal arc welding is proposed. The model comprises the model of evaporation in convective and diffusive regimes, model of anode processes and allows one to calculate basic physical properties of multicomponent arc plasma near the anode surface as functions of the anode surface temperature, anode chemical composition, electron temperature and electric current density at the anode surface. Evaporation of binary Al–Mg alloys with different magnesium mass fraction into argon plasma is considered on the basis of the proposed model. The dependences of the alloy boiling temperature on the magnesium mass fraction and electron temperature are presented. Several physical parameters, which are important from the technological point of view (magnesium mass flux, heat loss due to evaporation, anode potential drop, anode heat flux), are calculated for a wide range of anode surface temperature and different values of the magnesium mass fraction. In addition, the influence of heat loss due to evaporation on the total heat flux coming to the anode surface is demonstrated.
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