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Author

Masakatsu Maeda

Other affiliations: Denso, Nihon University, College of Industrial Technology  ...read more
Bio: Masakatsu Maeda is an academic researcher from Osaka University. The author has contributed to research in topics: Welding & Ohmic contact. The author has an hindex of 15, co-authored 94 publications receiving 1771 citations. Previous affiliations of Masakatsu Maeda include Denso & Nihon University.


Papers
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Journal ArticleDOI
TL;DR: In this article, the relationship between welding parameters and tensile properties of the joints has been investigated and it was shown that the tensile property and fracture locations of the joint are significantly affected by the welding process parameters.

460 citations

Journal ArticleDOI
TL;DR: In this article, three types of carbon steels with different carbon contents (IF steel, S12C, S35C) were friction stir welded under various welding conditions.
Abstract: In order to determine the effect of the carbon content and the transformation on the mechanical properties and microstructures of the FSW carbon steel joints, three types of carbon steels with different carbon contents (IF steel, S12C, S35C) were friction stir welded under various welding conditions. Compared with IF steel, the microstructures and mechanical properties of the carbon steel joints are significantly affected by the welding conditions. The strength of the S12C steel joints increases with the increasing welding speed (decreasing the heat input), while the strength of the S35C steel joints shows a peak near 200 mm/min. This can be explained by the relationship between the peak temperature and the A 1 and A 3 points. When friction stir welding is performed in the ferrite–austenite two-phase region, the microstructure is refined and the highest strength is then achieved.

362 citations

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TL;DR: In this article, the effect of the tool shape on the mechanical properties and microstructures of 5-mm thick welded aluminum plates was investigated, and the simplest shape, the ordinary shape (column with threads) and the triangular prism shape probes were used to weld three types of aluminum alloys.
Abstract: Prospecting the optimal tool design for welding steels, the effect of the tool shape on the mechanical properties and microstructures of 5-mm thick welded aluminum plates was investigated. The simplest shape (column without threads), the ordinary shape (column with threads) and the triangular prism shape probes were used to weld three types of aluminum alloys. For 1050-H24 whose deformation resistance is very low, a columnar tool without threads produces weld with the best mechanical properties; for 6061-T6 whose deformation resistance is relatively low, the tool shape does not significantly affect the microstructures and mechanical properties. For 5083-O whose deformation resistance is relatively high, the weldablity is significantly affected by the rotation speed. For a low rotation speed (600 rpm), the tool shape does not significantly affect the microstructures and mechanical properties of the joints.

264 citations

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TL;DR: In this article, the effective strain rate during friction stir welding (FSW) of Al alloy 1050 was estimated experimentally by simulating the recrystallized grains of the stir zone through a combination of the plane-strain compression at various strain rates and the subsequent cooling tracing the cooling cycle of FSW.

74 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the authors deal with the fundamental understanding of the process and its metallurgical consequences, focusing on heat generation, heat transfer and plastic flow during welding, elements of tool design, understanding defect formation and the structure and properties of the welded materials.

1,811 citations

Journal ArticleDOI
TL;DR: A comprehensive body of knowledge has built up with respect to the friction stir welding (FSW) of aluminium alloys since the technique was invented in 1991 is reviewed in this article, including thermal history and metal flow, before discussing how process parameters affect the weld microstructure and the likelihood of entraining defects.
Abstract: The comprehensive body of knowledge that has built up with respect to the friction stir welding (FSW) of aluminium alloys since the technique was invented in 1991 is reviewed The basic principles of FSW are described, including thermal history and metal flow, before discussing how process parameters affect the weld microstructure and the likelihood of entraining defects After introducing the characteristic macroscopic features, the microstructural development and related distribution of hardness are reviewed in some detail for the two classes of wrought aluminium alloy (non-heat-treatable and heat-treatable) Finally, the range of mechanical properties that can be achieved is discussed, including consideration of residual stress, fracture, fatigue and corrosion It is demonstrated that FSW of aluminium is becoming an increasingly mature technology with numerous commercial applications In spite of this, much remains to be learned about the process and opportunities for further research a

956 citations

Journal ArticleDOI
TL;DR: Friction stir welding (FSW) is a widely used solid state joining process for soft materials such as aluminium alloys because it avoids many of the common problems of fusion welding as mentioned in this paper.
Abstract: Friction stir welding (FSW) is a widely used solid state joining process for soft materials such as aluminium alloys because it avoids many of the common problems of fusion welding. Commercial feasibility of the FSW process for harder alloys such as steels and titanium alloys awaits the development of cost effective and durable tools which lead to structurally sound welds consistently. Material selection and design profoundly affect the performance of tools, weld quality and cost. Here we review and critically examine several important aspects of FSW tools such as tool material selection, geometry and load bearing ability, mechanisms of tool degradation and process economics.

624 citations

Journal ArticleDOI
TL;DR: In this article, the relationship between welding parameters and tensile properties of the joints has been investigated and it was shown that the tensile property and fracture locations of the joint are significantly affected by the welding process parameters.

460 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of tool pin profile and tool shoulder diameter on FSP zone formation in AA6061 aluminium alloy has been analyzed macroscopically and the tensile properties of the joints have been evaluated and correlated with the FSP zones formation.

404 citations