Experimental Analysis on Ultrasonic Resistance Spot Welding of Aluminum Alloys

IF 2.2 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Welding Journal Pub Date : 2023-09-01 DOI:10.29391/2023.102.017

HO KWON, UMAIR SHAH, XUN LIU, JULIO MALPICA, PATRICK LESTER, HARINI BONAM

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引用次数: 0

Abstract

A recently developed hybrid joining process known as ultrasonic resistance spot welding (URW) was used on various pairs of similar and dissimilar aluminum (Al) alloys with different thicknesses, including AA5182–AA5182, AA6111–AA6111, AA7075–AA6111, and AA7075–AA5182, and comprehensively studied. Compared to conventional resistance spot welding (RSW), URW of the alloys showed consistently enhanced mechanical behavior in lap shear and crosstension tests. This can be attributed to the multiple perspectives on microstructure improvements. For different stacks of Al alloys and welding conditions, nugget formation was promoted with a larger nugget size in URW. In the nugget center, ultrasonically assisted (UA) vibration facilitated the formation of an equiaxed crystal zone. At the nugget boundary, URW showed a narrower coarse columnar zone and partially melted zone, which are associatedwith the lowest hardness in the weld. Specifically in dissimilar Al welds, UA vibration moved the nugget more centered toward the weld interface. These microstructure improvements indicated UA vibration can homogenize temperature and elemental distribution, which modifies solidification behavior.

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铝合金超声电阻点焊试验分析

将超声电阻点焊(URW)技术应用于AA5182-AA5182、AA6111-AA6111、AA7075-AA6111、AA7075-AA5182等不同厚度的异种铝合金对上，并进行了综合研究。与传统的电阻点焊(RSW)相比，URW合金在搭接剪切和拉伸试验中表现出持续增强的力学性能。这可以归因于微观结构改进的多个角度。对于不同的铝合金堆砌和焊接条件，超熔堆中熔核尺寸越大，熔核形成越明显。在熔核中心，超声辅助(UA)振动促进了等轴晶区的形成。在熔核边界处，URW呈现出较窄的粗柱状区和部分熔化区，这些区域与焊缝硬度最低有关。特别是在不同的Al焊缝中，UA振动使熔核向焊缝界面中心移动。这些微观组织的改善表明，UA振动可以使温度和元素分布均匀化，从而改变凝固行为。

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来源期刊

Welding Journal 工程技术-冶金工程

CiteScore

3.00

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： The Welding Journal has been published continually since 1922 — an unmatched link to all issues and advancements concerning metal fabrication and construction. Each month the Welding Journal delivers news of the welding and metal fabricating industry. Stay informed on the latest products, trends, technology and events via in-depth articles, full-color photos and illustrations, and timely, cost-saving advice. Also featured are articles and supplements on related activities, such as testing and inspection, maintenance and repair, design, training, personal safety, and brazing and soldering.