Temperature measurement and closed-loop control in friction stir welding
- Fehrenbacher A. ,
- Duffie N.A. ,
- Ferrier N.J. ,
- et al
- Fehrenbacher A. ,
- Duffie N.A. ,
- Ferrier N.J. ,
- Zinn M.R. and
- Pfefferkorn F.E.
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Description
An accurate temperature feedback strategy and closed-loop feedback control system for temperature have been developed for friction stir welding. A wireless data acquisition system was constructed to measure temperatures at the tool-workpiece interface, with data transmitted via the Bluetooth protocol to a stationary computer. The tip of a thermocouple, placed at the interface of the tool and workpiece, was in contact with the workpiece material. Temperature variations within a single rotation of the tool could be measured in real time. A simple first-order model with transport delay was constructed to describe the relationship between spindle speed and measured interface temperature. The closed-loop temperature control system was used to regulate weld temperatures in the range 555 to 575 deg.C. Experimental results are presented for welds in 6061-T6 AlMgSi alloy (0.125 in (3.2 mm) thickness) using a tool of H13 tool steel. Welding was carried out with backing plates of differing thermal conductivities: low carbon steel; titanium; and copper.
8th International Symposium, 18-20 May 2010, Session 11: Process Control, Paper 03
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