摩擦圧接を用いた2017アルミニウム合金スタッド継手の強度

摘要

Stud joints of 2017 aluminum alloy were friction welded and its joint strength was examined. A stair zone formed at the weld interface. Although the hardness of the stair zone was almost the same as base metals, the heat affected zone of the bar and the plate was softened. The tensile strength of joints tended to increase with a pressure and a friction time, and the highest tensile strength was 275 MPa (63.1 % joint efficiency for the bar base metal). In the bending testing, joints were cracked in the weld zone at bending angle of less than 5°. In the fatigue testing, joints fractured near the weld interface and the fatigue strength of joints increased as the tensile strength of joints was high.%1．緒　言スタッド溶接1，2）は，ジベルやボルト等のスタッド材を孔あけやタップ立てなどの工程を経ずに，アーク溶接などで相手母材に直接溶植する方法であり，建築，橋梁，造船，車両，電気機器など多方面に使用されている．現在，アークスタッド溶接およびCDスタッド溶接（パーカッションスタッド溶接）が広く実用化されており，適応素材の大半は軟鋼であるが，銅，黄銅，純アルミニウム，ステンレス鋼にも適応されている．また，CDスタッド溶接ではこれら金属の組合せによる異種金属の溶接も可能である．