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

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Abstract

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.

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Subject classification (UKÄ) – MANDATORY

  • Control Engineering

Keywords

  • Cascade control Friction stir welding Temperature control Disturbance rejection PI controllers
Original languageEnglish
Pages (from-to)35-48
JournalControl Engineering Practice
Volume20
Issue number1
Publication statusPublished - 2012
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

key=ceder_etal2011 month=January

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