Effect of pin length on Friction Stir Spot Welding (FSSW) of dissimilar Aluminum-steel joints

Joaquin M. Piccini , Hernan G. Svoboda
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引用次数: 65

Abstract

Friction stir welding (FSW) has produced a great impact in several industries due to the advantages that this process presents. In particular, the automotive industry has developed a variant of the original process, called Friction Stir Spot Welding (FSSW), which has a strong interest related to the welding of aluminum alloys and dissimilar materials in thin sheets. Aluminum-steel welding is an actual challenge, being FSSW an alternative to produce these joints. However, the information available related to the influence of process parameters on the characteristics of aluminum-steel joints is scarce. The aim of this work was to study the effect of the pin length of the welding tool and its penetration depth, during friction stir spot welding (FSSW) of overlaps joints of AA6063 with galvanized low carbon steel. FSSW was done by changing the pins length between 0.65 and 1.5 mm, and also by modifying the tool penetration depth in the welded joints. On the welded spots macro and microstructural characterization was performed, Vickers microhardness profiles were determined and Peel and Cross Tension Tests were also done. The maximum loads increased when the tool penetration depth goes up and the pin length decreased. The fracture mode was, at first, interfacial meanwhile it changed to a circumferential mode when the tool penetration depth increased and the pins length was reduced.

针长对异种铝-钢连接搅拌摩擦点焊的影响
搅拌摩擦焊(FSW)由于其自身的优点,已经在许多行业产生了很大的影响。特别是,汽车工业已经开发了原始工艺的一种变体,称为搅拌摩擦点焊(FSSW),它对铝合金和薄板上不同材料的焊接有浓厚的兴趣。铝-钢焊接是一个实际的挑战,是FSSW生产这些接头的替代方案。然而,有关工艺参数对铝-钢连接特性影响的信息很少。研究了AA6063与镀锌低碳钢重叠接头搅拌摩擦点焊过程中,焊针长度和焊深对焊接效果的影响。FSSW通过改变销钉长度在0.65到1.5 mm之间,以及改变焊接接头中刀具的穿透深度来实现。对焊点进行了宏观和微观组织表征,测定了维氏显微硬度曲线,并进行了剥离和交叉拉伸试验。随着刀具侵彻深度的增大和销长的减小,最大载荷增大。随着刀具侵彻深度的增加和销钉长度的减小,初始断裂模式为界面断裂模式,逐渐转变为周向断裂模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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