６０６ｌアルミニウム合金とＳＵＳ３０４ステンレス鋼の摩擦圧接継手の動的強度

概要

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Destructive test of the joints was carried out for examining the impact and fatigue strength. The softened area of A6061 side of the joints welded under a higher upset pressure is narrower compared with that welded under a lower upset pressure, because the softened area of A6061 side was expelled as the upset burr by the action of upset pressure. The dynamic strength of the joints depends on the width of the softened area of A6061 side. In the case of smoothed impact specimen, the impact absorbed energy of the joints increases with increase in upset pressure, while it decreases with the upset pressure over 240 MPa. On the other hand, no smoothed specimens of A6061 base material fracture. In the case of notched specimen, the impact absorbed energy of the joints welded under the upset pressures over 160 MPa remains to be almost equal to the maximum value, and the maximum joint efficiency is about 15%. The impact fracture occurres both in the mixed area of the weld interface and in the softened A6061 area. The fatigue strength at a given endurance (number of cycles to failure 107) of A6061 base material and the joints welded under 120 MPa and 240 MPa upset pressure are 121 MPa, 112 MPa and 122 MPa, respectively. The fatigue fracture of the joints occurres in the softened A6061 area or in the mixed area of the weld interface and the softened A6061 area depending on the welding conditions.
一般社団法人軽金属学会の論文