G0400102 Forming and Joining Simultaneous Processing of Two Sheet Metals by Friction Stir Incremental Forming

Abstract

Environment problems are calling more and more attentions, so magnesium is a candidate due to its advantages such as light weight and high strength. However, it is difficult to deal with magnesium at a room temperature because of its poor ductility and heating device is need. So friction stir incremental forming process was developed in our laboratory to use the friction heat to form magnesium alloy sheets. Furthermore, incremental forming process was used at that situation which can change the shape of products only changing the NC code. In this study, to solve the problem that magnesium alloys have poor corrosion resistance, it is tired that magnesium alloy sheets and aluminum sheets are jointed during forming into a designed shape. Because of the thickness of sheets, the processing conditions for joining is restricted. Experiments were carried out to find the narrow range of working conditions for joining two sheets. Then the working conditions that sheets were formed and joined simultaneously were found. The joined products were observed under a scanning electron microscope and it has been confirmed that surface alloying was happened at the boundary area between two sheets.