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首页> 外文期刊>Journal of Manufacturing Processes >Material flow during refill friction stir spot welded dissimilar Al alloys using a grooved tool
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Material flow during refill friction stir spot welded dissimilar Al alloys using a grooved tool

机译：使用开槽工具在填充摩擦搅拌点焊异种铝合金期间的材料流动

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摘要

Material flow, intermixing and liquation cracking during refill friction stir spot welded (refill FSSW) dissimilar Al alloys were first investigated using a grooved tool. The results revealed that the weld was fabricated by a back-extrusion and forging process, and the material flow in the vertical direction created a mechanical inter-locking joining mechanism. During the sleeve plunging period, a constant thickness of dynamic recrystallization layer of Al 6022 sheet material was trapped underneath the sleeve bottom, and a drop region was formed at the sleeve outer periphery. Dissimilar intermixing was formed during the retraction period, in which the grooved sleeve facilitated the formation of intermixed microstructure comprising intermingled dissimilar lamellae adjacent to the rotating sleeve. Cracking caused by local melting of eta (MgZn2) phase particles was formed in the stir zone, which disappeared after welding process. The Al 6022 sheet material was significantly softened, since the density of needle shaped Mg2Si precipitate particles was relatively lower compared to that of the substrate material.
机译：首先使用带槽工具研究了在填充摩擦搅拌点焊（refill FSSW）异种铝合金中的材料流动，混合和液化开裂。结果表明，该焊缝是通过反向挤压和锻造工艺制造的，并且垂直方向上的材料流动产生了机械互锁连接机制。在套筒插入期间，恒定厚度的Al 6022板材动态再结晶层被捕获在套筒底部下方，并且在套筒外周形成了下落区域。在缩回期间形成不相似的混合，其中开槽的套筒促进了包括与旋转套筒相邻的混合的不相似薄片的混合微观结构的形成。在搅拌区形成由η（MgZn2）相颗粒局部熔化引起的裂纹，该裂纹在焊接过程后消失。由于针状Mg2Si沉淀颗粒的密度与基底材料相比相对较低，因此Al 6022板材显着软化。

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  • 来源
    《Journal of Manufacturing Processes》 |2020年第1期|260-270|共11页
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    Northwestern Polytech Univ Shaanxi Key Lab Frict Welding Technol Xian 710072 Peoples R China|Univ Waterloo Ctr Adv Mat Joining Waterloo ON N2L 3G1 Canada;

    Northwestern Polytech Univ Shaanxi Key Lab Frict Welding Technol Xian 710072 Peoples R China;

    Univ Waterloo Ctr Adv Mat Joining Waterloo ON N2L 3G1 Canada;

    Queens Univ Dept Mech & Mat Engn Kingston ON K7L 3N6 Canada;

    Shanghai Univ Engn Sci Sch Mat Engn Shanghai 201620 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Refill friction stir spot welding; Grooved tool; Dissimilar Al alloy; Material flow; Liquation cracking;

    机译：补充摩擦搅拌点焊;开槽工具;异种铝合金;物料流;液化裂化;

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