Evaporation phenomena of magnesium from droplet at welding wire tip in pulsed MIG arc welding of aluminium alloys
Evaporation phenomena of magnesium from droplet at welding wire tip in pulsed MIG arc welding of aluminium alloys
复制标题
铝合金脉冲MIG焊焊丝尖端熔滴镁的蒸发现象
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Mizutani
中科院分区：
文献类型：
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作者：
J. Wang;H. Nishimura;S. Katayma;M. Mizutani
使用铝镁焊丝焊接铝合金时，由于镁的蒸发，会产生大量的焊接烟雾。烟雾形成主要通过两种方法进行评估。平均形成率可以通过收集恒定焊接期间形成的烟雾来计算。另一种是通过高速视频观察液滴来进行。然而，这两种方法在定量评价脉冲金属惰性气体保护焊过程中峰值或背景期间镁的蒸发速率时变得无效。本文开发了一种新的方法来评估峰值期间镁的蒸发速率和通量。首先，使用机器人焊接系统通过在峰值期间的不同时间关闭峰值电流来产生一系列熔滴。其次，分析了这些液滴的镁含量。最后计算了峰值期间镁的蒸发速率和通量。
A lot of welding fumes are generated due to the evaporation of magnesium during welding aluminium alloys using Al–Mg welding wires. Fume formation is mainly evaluated by two methods. An average formation rate can be calculated by collecting the fumes formed during a constant welding period. The other one is carried out by observing the droplet with a high speed video. However, these two methods become invalid in quantitatively evaluating the evaporation rate of magnesium in peak or background period during pulsed metal inert gas arc welding. In this paper, a novel method was developed to evaluate the evaporation rate and flux of magnesium in the peak period. First, a robot welding system was used to produce a series of droplets by shutting down the peak current at different times in the peak period. Second, the magnesium contents of these droplets were analysed. Finally, the evaporation rate and flux of magnesium in the peak period were calculated.