Author
Y.C. Chen
Bio: Y.C. Chen is an academic researcher from Osaka University. The author has contributed to research in topics: Welding & Friction stir welding. The author has an hindex of 4, co-authored 8 publications receiving 211 citations.
Papers
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TL;DR: In this paper, an AC4C cast Al alloy and zinc-coated steel are successfully lap jointed using friction stir welding using interface microstructure using optical microscopy, scanning electron microscopy and X-ray diffraction.
79 citations
TL;DR: In this paper, the role of Zn coat on friction stir lap welding of Al alloy and Zn coated steel was investigated and shown to improve the weldability of Al and steel.
Abstract: AC4C cast Al alloy and Zn coated steel were successfully lap welded using friction stir welding technology. Full strength joints could be obtained and the joints fractured at Zn coated steel base metal side, while Al alloy and unzinced steel could not be welded in the same welding conditions. The joining mechanism and the role of Zn coat on friction stir lap welding of Al alloy and Zn coated steel were put forward. The intervention of Zn coat promoted the formation of Al–Zn low melting point eutectic structure at the interface, which significantly improved the weldability of Al and steel.
50 citations
48 citations
TL;DR: In this article, 1.316L stainless steel plates were friction stir processed using polycrystalline cubic boron nitride tools and the FSP zone was a roughly equiaxed grain structure and the grain size was in the range of 10-30 μm, which was smaller than that in the base metal (30-80 μm).
Abstract: 316L stainless steel plates were friction stir processed using polycrystalline cubic boron nitride tools. Mechanical properties and microstructure evolution of the friction stir processing (FSP) zone were investigated. Tensile test results showed that the tensile strengths of the defect free FSP zones were equal to those of base metals. All the samples fractured at the base metal side. Microstructural observation results showed that the grains in the FSP zone were refined by the tool. The FSP zone was a roughly equiaxed grain structure and the grain size was in the range of 10–30 μm, which was smaller than that in the base metal (30–80 μm). Moreover, transmission electron microscopy observation revealed that sigma phases formed in this zone during FSP.
48 citations
TL;DR: In this article, the effect of tool shoulder profile and tool probe profile on tool wear characterization and weld formation was investigated, and the results showed that tools with narrow pitch screw shoulder profile produce deeper FSW zone compared to the tools with wide pitch.
Abstract: 316L stainless steel plate was friction stir welded using PCBN tools. The effect of tool shoulder profile and tool probe profile on tool wear characterization and weld formation was investigated. Two different shoulder profiles (screw with different pitches) with four different tool probe profiles (two different probe end shapes and two different probe lengths) have been used to fabricate FSW zone. Experimental results show that the tools with narrow pitch screw shoulder profile produce deeper FSW zone compared to the tools with wide pitch. The tools with spiral probe profile produce deeper FSW zone compared to the tools with chamfer probe profile. The tools with wide pitch screw shoulder profile is apt to produce lower working loads. The wear resistant of tools with chamfer probe profile is significantly higher than that of tools with spiral probe profile. The relation between tool geometries and tool wear and weld formation is discussed.
4 citations
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TL;DR: In this paper, a feasibility study was performed to fabricate ITER In-Vessel components by Selective Laser Melting (SLM) supported by Fusion for Energy (F4E), almost fully dense 316L stainless steel (SS316L) components were prepared from gas-atomized powder and with optimized SLM processing parameters.
509 citations
TL;DR: In this article, a comprehensive understanding of the fundamentals of the microstructural evolution during FSW/P has been developed, including the mechanisms underlying the development of grain structures and textures, phases, phase transformations and precipitation.
390 citations
TL;DR: Friction stir welding (FSW) is widely accepted to be one of the most significant welding techniques to emerge in the last 20 years and has been widely used for joining alloys in various industrial applications.
Abstract: The friction stir welding (FSW) technique is widely accepted to be one of the most significant welding techniques to emerge in the last 20 years. Friction stir welding of Al-alloys is now commonplace and is covered in several recent reviews, including one in this journal. Consequently, the technique is currently being used for joining of these alloys in various industrial applications. Complementary to these developments has been a dramatic increase in research into joining of other alloys and systems by FSW. This field is very active, but less mature. Thus, the aim of this review article is to build on our understanding of the fundamentals, as applied to Al-alloys that laid out in the previous review in this journal, and to address the current state-of-the-art of FSW developing beyond Al-alloys, including Mg-alloys, Cu-alloys, steels, Ti-alloys and metal matrix composites, focusing particularly on microstructural aspects, including texture formation, and the resulting properties of these joints. ...
385 citations
TL;DR: In this article, the authors provide an overview of the state of the art in such joining processes, including cold welding, friction stir welding, self-pierce riveting, mechanical clinching and joining by forming.
365 citations
TL;DR: In this article, the authors assess the status of friction stir welding of dissimilar alloys and identify the opportunities and challenges for the future, and present a special issue of Science and Technology of Welding and Joining.
Abstract: Friction stir welding does not involve bulk melting of the components that are joined. This has inspired attempts to exploit it for joining materials which differ in properties, chemical composition or structure, and where fusion can lead to detrimental reactions. The purpose of this special issue of Science and Technology of Welding and Joining was to assess the status of friction stir welding of dissimilar alloys and to identify the opportunities and challenges for the future.
261 citations