Numerical analysis of reverse dual-rotation friction stir welding process

【摘要】 A three-dimensional model of reverse dual-rotation friction stir welding(RDR-FSW) is developed to conduct the numerical simulation of heat generation and material flow during the process.The reverse rotation of the assisted shoulder and the tool pin is considered to model the heat generation rate.The predicted temperature difference between the advancing side and the retreating side in RDR-FSW is less than that in conventional FSW.There are two reverse flows during the RDR-FSW which is beneficial to the uniformity of the temperature profile.Due to the reverse rotation effects of the assisted shoulder,the predicted shape and size of thermal-mechanically affected zone(TMAZ) based on the iso-viscosity line are decreased greatly compared to the conventional FSW.It lays solid foundation for optimizing the process parameters in RDR-FSW.更多还原

【Abstract】 A three-dimensional model of reverse dual-rotation friction stir welding(RDR-FSW) is developed to conduct the numerical simulation of heat generation and material flow during the process.The reverse rotation of the assisted shoulder and the tool pin is considered to model the heat generation rate.The predicted temperature difference between the advancing side and the retreating side in RDR-FSW is less than that in conventional FSW.There are two reverse flows during the RDR-FSW which is beneficial to the uniformity of the temperature profile.Due to the reverse rotation effects of the assisted shoulder,the predicted shape and size of thermal-mechanically affected zone(TMAZ) based on the iso-viscosity line are decreased greatly compared to the conventional FSW.It lays solid foundation for optimizing the process parameters in RDR-FSW.更多还原