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Cascaded Control of Power Input and Welding Temperature During Sealing of Spent Nuclear Fuel Canisters

[+] Author Affiliations
Lars Cederqvist

Swedish Nuclear Fuel and Waste Management Company (SKB), Oskarshamn, Sweden

Olof Garpinger

Xdin AB, Frölunda, Sweden

Tore Hägglund, Anders Robertsson

Lund University, Lund, Sweden

Paper No. DSCC2010-4123, pp. 453-460; 8 pages
  • ASME 2010 Dynamic Systems and Control Conference
  • ASME 2010 Dynamic Systems and Control Conference, Volume 2
  • Cambridge, Massachusetts, USA, September 12–15, 2010
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 978-0-7918-4418-2 | eISBN: 978-0-7918-3884-6
  • Copyright © 2010 by ASME


The friction stir welding procedure to seal copper canisters requires variable power input throughout the 45 minute long weld cycle to keep the welding temperature within the process window. This is due to variable thermal boundary conditions throughout the weld cycle which, together with fast disturbances in the spindle torque, requires control of both the power input and the welding temperature to achieve a stable and robust process. By using a cascaded loop that determines the power input requirement, the regulator will not be dependent on repeatability in the necessary power input between weld cycles. As a result, a more accurate and reliable closed-loop control of the welding temperature is acquired.

Copyright © 2010 by ASME



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