固相スタッド接合したSS400鋼スタッドと5052アルミニウム合金板の接合界面組織と温度履歴

Abstract

SS400 steel studs were joined to 5052 aluminum alloy plates by solid-state stud welding at charged voltages of 300 to 475 V. Effects of joining conditions on the interfacial microstructures and tensile fracture load of the joints were evaluated. Thin intermediate layers (Al5Fe2 and Al3Fe) approximately 1 µm thick in total were observed along the joint interface at a distance of 150 µm from both ends of the interface respectively. The tensile fracture surfaces on the stud after tensile test were covered with dimpled structures, indicating ductile fracture, with the exception of the stud tip. This indicates that the stud and plate were joined strongly enough for the base material to partially fracture during the tensile test. The fracture load increased with charged voltage up to 450 V but decreased gradually thereafter. The maximum temperature reached during joining could be also estimated by the presence of martensite near the joint interface.