摘要
Electrically assisted friction stir welding is a promising way to improve liquidity of viscoplastic metal. However, this local heat source only can take into effect in a certain contact interface status. Semi-analytical model and FEM are adopted to analyze materials flow in electrically assisted FSW. Semi-analysis results show that Joule heating is validity with rotation speed 1 400 r/min and travel speed 400 mm/min. The maximum flow velocity is 0.033 m/s when travel speed is 400 mm/min, and it increases to 0.043 m/s with current assistant. Visco-plasticizing efficiency is a key factor to decide whether Joule heat is significant, and viscoplastic flow can periodically make circuit short. Periodic torque, axial force and onion rings surface show dynamic flow process, which can be used to illustrate the dynamic contact resistance feature and correct the calculation equation of Joule heat. This paper is aim to point out the potential relation between viscoplastic flow, periodic torque and Joule heating validity.
作者
耿海滨
罗键
高建军
项俊锋
Geng Haibin;Luo Jian;Gao Jianjun;Xiang Junfeng(School of Mechanical Engineering and Automation,Fuzhou University,Fujian 350116,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;School of Mechanical Engineering,Chongqing University,Chongqing 400044,China)
基金
supported by State Key Lab of Advanced Welding and Joining
Harbin Institute of Technology(AWJ-20-Z02)
Chongqing Research Program of Basic Research and Frontier Technology (CSTC 2016jcyjA0692)
Fuzhou University Testing Fund of precious apparatus (No. 2019T010 and 2019T012)。
