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Cascade control of the friction stir welding process to seal canisters for spent nuclear fuel

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Author

Summary, in English

This article presents the development to reliably seal copper canisters containing the Swedish nuclear waste, using friction stir welding. To avoid defects and welding tool fractures, it is important to control the welding temperature within a span of 790–910 degrees C. A cascade controller is used to efficiently suppress fast power input disturbances reducing their impact on the temperature. The controller is tuned using a recently presented method for robust PID control. Results show that the controller keeps the temperature within 710 degrees C during the 40 min long joint line sequences. Apart from the cascaded control structure, good process knowledge and control strategies adapted to different weld sequences have contributed to the successful results.

Publishing year

2012

Language

English

Pages

35-48

Publication/Series

Control Engineering Practice

Volume

20

Issue

1

Document type

Journal article

Publisher

Elsevier

Topic

  • Control Engineering

Keywords

  • Cascade control Friction stir welding Temperature control Disturbance rejection PI controllers

Status

Published

Project

  • PID Control
  • PICLU

Research group

  • LCCC

ISBN/ISSN/Other

  • ISSN: 0967-0661