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Ultrasonic thermometry for friction stir spot welding |
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| Affiliation: | Welding Automation Laboratory, Vanderbilt University, 2301 Vanderbilt Pl., Nashville, TN 37235, United States;Civil and Materials Engineering, University of Illinois at Chicago, 842 W Taylor Street ERF, 2095 Chicago, IL, United States;Department of Mechanical Engineering, National Institute of Technology Rourkela, 769008 Odisha, India;Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada;Caroll A. Campbell Jr. Graduate Engineering Centre (CGEC), Clemson University-International Centre for Automotive Research (CU-ICAR), 4 Research Drive, Greenville, SC 29607, United States;School of Materials Science & Engineering, Tianjin University, Tianjin 300072, China;MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing, Institute of Materials Joining, Shandong University, Jinan 250061, China |
| Abstract: | This investigation presents the feasibility of ultrasonic temperature measurement of friction stir spot welding (FSSW). FSSW is an automated solid state joining process. Thermal profiles of the weld zone are crucial for implementing informed process changes to improve weld quality. Ultrasonics present a novel and non-invasive method of monitoring changes in temperature.Ultrasonic time of flight (TOF) measurement method is used to calculate the temperature of Al 6061 as it is heated. Comparisons of the ultrasonic temperature calculations with thermocouple readings confirm the accuracy of the ultrasonic system. The ultrasonic signal is then recorded during spot welding and processed. The results show that ultrasonic technology is a feasible method of monitoring the heating and cooling profiles of the weld zone during welding. The paper also discusses challenges presented by the system as well as recommendations for its future implementation in the friction stir welding manufacturing industry. |
| Keywords: | Ultrasonic thermometry Time of flight (TOF) Friction stir spot welding (FSSW) |
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