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首页> 外文期刊>International Journal of Heat and Mass Transfer >A novel unified model of keyhole plasma arc welding
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A novel unified model of keyhole plasma arc welding

机译：匙孔等离子弧焊的新型统一模型

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摘要

Keyhole plasma arc welding (PAW) has great potential in the advanced manufacturing industry. Previous research on PAW mainly concerns heat transfer in workpiece without plasma arc. Only several researchers constructed unified models of plasma arc and weld pool to investigate the keyhole welding process by Volume of Fluid (VOF) technique, while it takes too much computational time and resources. A novel unified heat transfer model was developed to demonstrate the keyhole-mode heat transfer in weld pool avoiding the cumbersome VOF technique. With a simple tip to exert the arc pressure calculated from plasma arc region into the weld pool, the model presents equivalent effects like a keyhole model. Electro-magneto-thermal conversion and the resulting thermal-mechanical interaction between plasma arc and weld pool are revealed. Heat flux and arc pressure both display a Gaussian distribution on the workpiece surface, and metal within r = 4 mm is mostly affected. Weld pool gradually increases into a "reversed bugle-like" configuration due to the coupled thermal-mechanical effects from plasma arc. Two opposite circular flows appear at the bottom and the top edge of weld pool, which are dominated by the plasma arc force and Marangoni force, respectively. Calculated arc pressure distributions generally coincide with experimental results and previous research, and calculated weld pool geometry agrees well with experimental result, as well as the time for full penetration welding. The new model shows quite good applicability and simplicity. (C) 2018 Elsevier Ltd. All rights reserved.
机译：锁孔等离子弧焊（PAW）在先进的制造业中具有巨大的潜力。先前对PAW的研究主要涉及没有等离子弧的工件中的热传递。只有很少的研究人员构建了等离子弧和焊缝池的统一模型，以通过流体体积（VOF）技术研究匙孔焊接过程，而这需要太多的计算时间和资源。开发了一种新颖的统一传热模型，以证明避免了繁琐的VOF技术，从而在焊缝池中实现了键孔模式传热。使用简单的尖端即可将根据等离子弧区域计算出的电弧压力施加到焊缝池中，该模型具有与锁孔模型一样的等效效果。揭示了电磁热转换以及等离子弧和焊缝之间的热机械相互作用。热通量和电弧压力都在工件表面上都显示出高斯分布，并且r = 4 mm之内的金属受到的影响最大。由于等离子弧的耦合热机械作用，熔池逐渐增加为“反向喇叭状”配置。在焊池的底部和顶部边缘出现两个相反的圆形流，分别由等离子弧力和Marangoni力控制。计算出的电弧压力分布通常与实验结果和先前的研究相吻合，并且计算出的焊池几何形状与实验结果以及完全熔透焊接的时间非常吻合。新模型显示出很好的适用性和简单性。 （C）2018 Elsevier Ltd.保留所有权利。

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