A Transient Thermal Model for Friction Stir Weld. Part I: The Model

摘要: Current analytical thermal models for friction stir welding (FSW) are mainly focused on the steady-state condition. To better understand FSW process, we propose a transient model FSW, which considers all periods of FSW. A temperature-dependent apparent coefficient solved by inverse solution method (ISM) is used to estimate heat generation rate. The physical reasonableness, self-consistency, and relative achievements this discussed, relationships between generation, coefficient, temperature established. negative feedback mechanism positive proposed first time found be dominant factors in controlling turn temperature. Furthermore, controller level validity proved applying it 6061-T651 6063-T5 aluminum alloys.