Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 02, 2019 - November 04, 2019
In recent years, it has been promoted to apply aluminum alloys to automobile structural components in order to reduce body weight and improve the fuel efficiency. On the other hand, resistance spot welding is commonly used as the method of welding of thin steel plates. Therefore, it is demanded that the dissimilar material joining used resistance spot welding at the production line of automobile. It is known that joining strength of peeling direction is increased as thickness of intermetallic compound edge part decrease for Fe-Al dissimilar material resistance spot welding. However, it is known that in spite of thickness of intermetallic compound edge part decrease, joining strength of peeling direction is not increased depending on conditions of construction of welding conditions. Therefore, it is thought that there is the factor other than thickness of intermetallic compound edge part affects cross tension strength. In this study, in order to investigate the factor affects cross tension strength, crack propagation behavior was observed and conducted Vickers hardness test at resistance spot welded area in aluminum alloy. As the result, it was indicated that the crack was progressed in the aluminum alloy of melted area. In addition, it was confirmed that there was the difference of crack propagation behavior for the aluminum alloy of melted area, depending on the shape of the electrodes. Moreover, cross tension strength was increased as the average Vickers hardness of aluminum alloy of melted area increased. Therefore, the average Vickers hardness of aluminum alloy of melted area suggested to be a factor affecting cross tension strength.
