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

Cederqvist, Lars; Garpinger, Olof; Hägglund, Tore LU and Robertsson, Anders LU (2012) In Control Engineering Practice 20(1). p.35-48
Abstract (Swedish)
Abstract in Undetermined

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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cascade control Friction stir welding Temperature control Disturbance rejection PI controllers
in
Control Engineering Practice
volume
20
issue
1
pages
35 - 48
publisher
Elsevier
external identifiers
  • wos:000297833600005
  • scopus:80655127676
ISSN
0967-0661
DOI
10.1016/j.conengprac.2011.08.009
project
PID
PICLU
language
English
LU publication?
yes
id
95e5fe67-177c-43a6-a21a-ad465137ed02 (old id 2224209)
date added to LUP
2011-12-08 11:11:17
date last changed
2017-10-29 03:14:06
@article{95e5fe67-177c-43a6-a21a-ad465137ed02,
  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.},
  author       = {Cederqvist, Lars and Garpinger, Olof and Hägglund, Tore and Robertsson, Anders},
  issn         = {0967-0661},
  keyword      = {Cascade control Friction stir welding Temperature control Disturbance rejection PI controllers},
  language     = {eng},
  number       = {1},
  pages        = {35--48},
  publisher    = {Elsevier},
  series       = {Control Engineering Practice},
  title        = {Cascade control of the friction stir welding process to seal canisters for spent nuclear fuel},
  url          = {http://dx.doi.org/10.1016/j.conengprac.2011.08.009},
  volume       = {20},
  year         = {2012},
}