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Numerical Modeling of Extrusion Welding in Magnesium Alloys

机译：镁合金挤压焊接的数值模拟

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Solid-state welding takes place during the extrusion of hollow shapes and tubes made from selected metals such as aluminum and magnesium and their alloys. DEFORM™ is one of the most frequently used FEM software packages to analyze the metal flow in deformation processes. However, it has some limitations while applied to study the extrusion welding. The 2D and 3D versions of DEFORM™ cannot determine if extrusion welding takes place in a port-hole die. This limitation is a result of a lack of ability to transfer the localized deformation conditions to a judgment about a good or poor weld. In this work, a new modeling method has been proposed to obtain the localized information at the extrusion welding seam. A so-called pressure plate was virtually inserted in the position of the extrusion welding seam, which plays a role of a sensor and has recorded all the information at the given seam during the entire extrusion process. Analytical methods have been utilized to study the data collected from this sensor to evaluate the probability of the formation of the sound extrusion welding seam. The generated results have been used to verify Plata & Piwnik extrusion welding criterion and can be implemented into existing extrusion models to achieve better prediction of weld integrity.
机译：固态焊接是在中空形状和由选定金属（例如铝和镁及其合金）制成的管材的挤压过程中进行的。 DEFORM™是最常用的FEM软件包之一，用于分析变形过程中的金属流动。但是，在研究挤压焊接时有一定的局限性。 DEFORM™的2D和3D版本无法确定是否在孔模具中进行挤压焊接。这种局限性是由于缺乏将局部变形条件转移到关于焊接好坏的判断上的结果。在这项工作中，提出了一种新的建模方法来获得挤压焊缝处的局部信息。实际上在挤压焊缝的位置上插入了一个所谓的压板，该压力板起着传感器的作用，并在整个挤压过程中记录了给定焊缝的所有信息。已经使用分析方法来研究从该传感器收集的数据，以评估形成合理的挤压焊缝的可能性。生成的结果已用于验证Plata＆Piwnik挤出焊接标准，并可将其应用于现有的挤出模型中，以实现对焊接完整性的更好预测。

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