高速固相接合した2024アルミニウム合金スタッドと5052アルミニウム合金板の組織と強度に及ぼす板厚の影響
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概要
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The advanced high-speed solid-state joining method was developed for stud welding of aluminum alloys. A double cylindrical copper tube, consisting of an inner tube and outer tube served as a pair of electrodes. A specially designed stud with a circular ridge projection at the bottom was mounted at the end of the inner tube. The stud was then pressed against the plate surface and a discharge current was introduced to the stud through the inner tube, whereupon current flew through the plate surface on to the outer tube, which acted as a ground. The circular ridge projection crushed and spread along the plate surface. High-density current running through the contact point acted to increase the local temperature, and this promoted plastic deformation and enhanced atomic diffusion at the contact point. The welding was normally completed within a few milliseconds and the temperature increase of the joint was negligible. In the present study, cylindrical 2024-T3 aluminum alloy studs were welded to 5052-H34 aluminum alloy plates with various plate thicknesses from 1 to 4 mm. The circular ridge projection crushed and spread along the plate surface. Deformation of the projection took place almost symmetrically about the projection tip, and the joining was achieved in the shape of double rings on the plate for the thick plates (e.g. 3 and 4 mm). This resulted in high strength of the joint. While, for the thin plate (e.g. 1 mm), asymmetrical deformation occurred on both the inner side and the outer side of the projection. Joining was made mainly at the outer-side of the projection and so the joining area exhibited the shape of a single ring on the plate surface. This resulted in the decreased joining area and the reduced joint strength. It was revealed that not only the position of electrodes but also the plate thickness controlled the current flow and the resultant microstructure and strength on the joint interface.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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