Friction stir lap welding between A6061/SPC270 thin sheets using welding tool with scroll shoulder

Q4 Materials Science

Welding International Pub Date : 2023-06-18 DOI:10.1080/09507116.2023.2222485

Yuheng Liu, T. Yasui, Toshiaki Fukuhara, Shuhei Yamaguchi, Katashi Hirosawa, T. Mori

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引用次数: 0

Abstract

Abstract Dissimilar materials welding between A6061 and SPC270 thin sheets was performed through friction stir lap welding and the effects of welding tool shape and clearance were investigated. The welding process was carried out on the 3-axis vertical machining center without tilt angle, using welding tools with flat or scroll shoulder surfaces. The highest tensile shear strength of 208.2 MPa using the flat shoulder was achieved under tool rotation speed of 2000 rpm and welding speed of 500 mm/min. Groove-like defects were found at the advancing side of this welding joint, which was thought to be caused by the deficiency of plastic material flow. Scroll shoulder improved the plastic material flow of aluminum alloys and weld surface without defects. However, cavities were formed in joints welding with a clearance of 0.1 mm near the interface between A6061 and SPC270. Reduction of clearance suppressed the formation of cavities and tensile shear strength of 217.9 MPa was achieved with the clearance of 0 mm. The welding interface was observed by SEM and TEM for microstructure investigation. Welding interface temperature during FSLW was measured and the factors for welding strength variation were also discussed in this paper.

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A6061/SPC270薄板间的搅拌摩擦搭接焊接采用带滚动肩的焊接工具

摘要采用搅拌摩擦搭接法对A6061与SPC270异种材料薄板进行焊接，研究了焊接工具形状和间隙对焊接效果的影响。焊接过程在无倾斜角的3轴立式加工中心上进行，焊接工具采用平肩面或涡旋肩面。在刀具转速为2000 rpm、焊接速度为500 mm/min的条件下，平肩的抗拉剪切强度最高，达到208.2 MPa。在焊接接头推进侧发现了沟槽状缺陷，认为这是由于塑性材料流动不足造成的。涡旋肩改善了铝合金塑性材料的流动，焊缝表面无缺陷。然而，在A6061与SPC270交界面附近焊接时，出现了间隙为0.1 mm的空腔。间隙的减小抑制了空腔的形成，当间隙为0 mm时，抗拉剪切强度达到217.9 MPa。采用扫描电镜(SEM)和透射电镜(TEM)观察焊接界面的微观组织。对FSLW过程中的焊接界面温度进行了测量，并对影响焊接强度变化的因素进行了讨论。

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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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.