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

Lars Cederqvist; Olof Garpinger; Tore Hägglund; Anders Robertsson

doi:10.1016/j.conengprac.2011.08.009

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

Lars Cederqvist, Olof Garpinger, Tore Hägglund, Anders Robertsson

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	35-48
Journal	Control Engineering Practice
Volume	20
Issue number	1
DOIs	https://doi.org/10.1016/j.conengprac.2011.08.009
Publication status	Published - 2012

Bibliographical note

key=ceder_etal2011
month=January

Subject classification (UKÄ)

Control Engineering

Free keywords

Cascade control Friction stir welding Temperature control Disturbance rejection PI controllers

Access to Document

10.1016/j.conengprac.2011.08.009

PID Control
Robertsson, A. (Researcher), THEORIN, A. (Researcher), Bernhardsson, B. (Researcher), Berner, J. (Researcher), Åström, K. J. (Researcher), Hast, M. (Researcher), Garpinger, O. (Researcher), Larsson, P.-O. (Researcher), Hägglund, T. (Researcher), Romero Segovia, V. (Researcher) & Soltesz, K. (PI)
1900/01/01 → 2022/05/01
Project: Research
PICLU
Andersson, N. (Researcher), Borg, N. (Researcher), Lindholm, A. (Researcher), Robertsson, A. (Researcher), THEORIN, A. (Researcher), Bernhardsson, B. (Researcher), Johnsson, C. (Researcher), Åkesson, J. (Researcher), Åström, K. J. (Researcher), Soltesz, K. (Researcher), Hast, M. (Researcher), Stark, O. (Researcher), Garpinger, O. (Researcher), Larsson, P.-O. (Researcher), Giselsson, P. (Researcher), Hägglund, T. (Researcher) & Romero Segovia, V. (Researcher)
1900/01/01 → 2016/12/31
Project: Research

Cite this

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title = "Cascade control of the friction stir welding process to seal canisters for spent nuclear fuel",

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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AU - Hägglund, Tore

AU - Robertsson, Anders

N1 - key=ceder_etal2011 month=January

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AB - 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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DO - 10.1016/j.conengprac.2011.08.009

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JO - Control Engineering Practice

JF - Control Engineering Practice

IS - 1

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

Abstract

Bibliographical note

Subject classification (UKÄ)

Free keywords

Access to Document

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Projects

PID Control

PICLU

Cite this