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1.	Sikström, Fredrik, 1971-, et al. (author) Simulation for Design of Automated Welding 2007 In: EUROCON, 2007. The International Conference on "Computer as a Tool". - : IEEE Explore. - 142440813X - 9781424408139 ; , s. 2263-2270 Conference paper (peer-reviewed)abstract This paper describes a promising approach where simulations were used in the design of real-time control for automated welding. A finite element method has been used for thermal modelling of gas tungsten arc welding on a simplified test object. Measurement data for model calibration and validation was acquired through thermal imaging during weld experiments on test objects of the alloy Fe-316. An optimisation scheme for inverse modelling was employed in the calibration of the distributed weld process model. Frequency weighted model reduction and parametric system identification were applied and evaluated to get a low order model of the single-input single-output dynamics between a simulated weld heat source (actuator) and a sensor. This low order model was then successfully used for controller design where the control signal was weld current and the measured output was a moving spot temperature. Finally, the closed-loop performance was evaluated by simulation of the weld process model showing improved temperature stability relative to open loop.

Sikström, Fredrik, 1971-, et al. (author)
Simulation for Design of Automated Welding
2007
In: EUROCON, 2007. The International Conference on "Computer as a Tool". - : IEEE Explore. - 142440813X - 9781424408139 ; , s. 2263-2270
Conference paper (peer-reviewed)abstract
- This paper describes a promising approach where simulations were used in the design of real-time control for automated welding. A finite element method has been used for thermal modelling of gas tungsten arc welding on a simplified test object. Measurement data for model calibration and validation was acquired through thermal imaging during weld experiments on test objects of the alloy Fe-316. An optimisation scheme for inverse modelling was employed in the calibration of the distributed weld process model. Frequency weighted model reduction and parametric system identification were applied and evaluated to get a low order model of the single-input single-output dynamics between a simulated weld heat source (actuator) and a sensor. This low order model was then successfully used for controller design where the control signal was weld current and the measured output was a moving spot temperature. Finally, the closed-loop performance was evaluated by simulation of the weld process model showing improved temperature stability relative to open loop.

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