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首页> 外文期刊>International Journal of Microstructure and Materials Properties >The mechanical properties of the GMAW, GTAW and FSW joints of the RDE-40 aluminium alloy
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The mechanical properties of the GMAW, GTAW and FSW joints of the RDE-40 aluminium alloy

机译：RDE-40铝合金的GMAW，GTAW和FSW接头的机械性能

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摘要

The present study is concerned with the effect of welding processes on the mechanical properties of the RDE-40 aluminium alloy, closely confirming with the AA7039 (Al-Zn-Mg) alloy. The frequently preferred welding processes for this alloy are Gas Tungsten Arc Welding (GTAW) and Gas Metal Arc Welding (GMAW) due to their comparatively easier applicability and better economy. In this alloy, the weld fusion zones typically exhibit coarse columnar grains because of the prevailing thermal conditions during weld metal solidification. This often results in inferior weld mechanical properties and poor resistance to hot cracking. Friction Stir Welding (FSW) is an innovative solid-phase welding technique that was developed primarily for welding metals and alloys that heretofore have been difficult to weld using more traditional fusion techniques. In the present work, the tensile properties, microhardness, microstructure and fracture surface morphology of the GMAW, GTAW and FSW joints are evaluated and results are compared. From this investigation, it is found that the FSW joints of the RDE-40 aluminium alloy shows superior mechanical properties compared with the GTAW and GMAW joints and this is mainly due to the formation of a very fine, equiaxed microstructure in the weld zone.
机译：本研究关注焊接工艺对RDE-40铝合金力学性能的影响，与AA7039（Al-Zn-Mg）合金密切相关。这种合金最常用的焊接工艺是钨极氩弧焊（GTAW）和气态金属电弧焊（GMAW），因为它们的适用性和经济性相对较高。在这种合金中，由于焊接金属凝固过程中普遍存在的热条件，焊接熔合区通常呈现出粗大的柱状晶粒。这通常导致焊​​接机械性能较差，并且抗热裂性差。搅拌摩擦焊（FSW）是一种创新的固相焊接技术，主要用于焊接金属和合金，而以前使用传统的熔合技术很难焊接这些金属和合金。在目前的工作中，对GMAW，GTAW和FSW接头的拉伸性能，显微硬度，显微组织和断裂表面形态进行了评估并比较了结果。从这项调查中发现，与GTAW和GMAW接头相比，RDE-40铝合金的FSW接头显示出优越的机械性能，这主要是由于在焊接区形成了非常细的等轴微结构。

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