プローブの無い渦溝ツールによる摩擦撹拌スポット接合アルミニウム合金の接合組織と引張せん断特性

概要

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Friction-stir spot welding (FSSW) has been performed using a newly designed scrolled groove shoulder tool without probe in aluminium alloy. The effect of welding parameter on the welding structure and tensile-shear strength of welds was evaluated and the possibility of the scrolled groove shoulder tool in FSSW was discussed. When the scrolled groove shoulder tool was used, the stir zone attained a depth of 2mm, while when the plain tool without scroll groove was employed, no stirring occurred in the depth direction, thus it was confirmed that the scroll groove formed on the shoulder surface was very useful in FSSW. Tensile-shear strength was found to be dependent on the welding parameters such as tool rotational speed, shoulder plunge depth and tool holding time and was considerably higher than in the welds joined by the plain tool. The maximum strength of 4.6kN was obtained under the condition of a tool rotational speed of 3000rpm, a shoulder plunge depth of 0.7mm and a tool holding time of 4sec. Two different fracture modes, shear fracture and plug fracture, were observed depending on shoulder plunge depth and tool holding time at a fixed tool rotational speed. Shear fracture occurred at a less shoulder plunge depth or at short tool holding times, while plug fracture took place at long tool holding times or at large shoulder plunge depths.
社団法人日本機械学会の論文
2009-02-25