Study on a novel electrical-assisted pressure welding process of thin metallic foils
Joining of very thin metallic foils is required in vast applications such as fuel cell plates,micro reactor carriers,heat exchanger etc.Pressure welding is found to be an efficient method.However,some metals (e.g.,stainless steel) are difficult to achieve successful solid state bond at room temperature.In present study,a novel electric assisted pressure welding (EAPW) process was proposed,in which electric current was introduced to the metal under pressure welding in the purpose of reducing welding difficulty and improving the welding performance.An EAPW experimental setup was developed to study the joining process of Stainless Steel (SS) 316 sheets.The effects of electric current as well as process conditions on the final bond strength were experimentally studied.It was found that SS316 sheets could not be bonded without current at room temperature.However,they were successfully joined with 6.7A/mm2 electric current introduced.The co-effects of temperature and electric current were investigated.Experiments of different current density were carried out,and specimens joined at larger current density performed better bond strength.Elevated temperature caused by Joule heat was an important,but not the only reason for the improvement.The so-called electro-plastic effect also makes a contribution in EAPW process according to the experiments.Finally finite element method (FEM) was also employed to analyze the process and the welding behavior was discussed.
Electrical assisted pressure welding solid state bonding thin metal sheets electro-plasticity
Zhutian Xu Linfa Peng Peiyun Yi Xinmin Lai
Shanghai Key Laboratory of Digital Auto Body Engineering, Shanghai Jiao Tong University,Shanghai 200 State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University,Shanghai 2002
国际会议
香港
英文
147-151
2012-12-11（万方平台首次上网日期，不代表论文的发表时间）