摩擦攪拌スポット接合継手の強度特性に及ぼすツールショルダー径の影響

概要

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The effect of tool geometry on microstructure and tensile shear strength in friction stir spot weld of 6061 aluminium alloy sheets was studied. Tools with three different shoulder diameters were evaluated. The shape parameters d_n and t_u were defined from the weld structure observed on the cross section of the weld centre, which represent the actual nugget size and the thickness of the upper sheet under tool shoulder circumference, respectively. These parameters and the shape of the speed and tool holding time. The tensile shear strengths at the fixed tool rotational speed were dependent on tool holding time and shoulder diameter. Two fracture modes were recognized under tensile shear loading at the shoulder diameters of 10 and 15 mm. The dependence of static strength on shoulder diameter was discussed based on the shape parameters and fracture modes.
社団法人日本機械学会の論文
2008-02-25