Scan orbital welding of cylindrical vessel, flange, and piping parts is performed by their rapid revolution under a radially or axially translated heat source, with its power modulated so as to implement a specified thermal distribution. Thus, the plasma-arc welding torch sweeps the stainless steel surface to generate a desirable temperature field and the concomitant material features. A numerical simulation of the thermal field is developed for off-line analysis. On this basis, a lumped thermal regulator of the heat-affected zone, employing infrared temperature feedback at a single spot, as well as standard PI, gain scheduling, and self-tuning control algorithms is tested. The thermal model is also employed for real-time torch efficiency identification and compensation. The numerical reference model serves as the basis for an in-process adaptive thermal control system to regulate the temperature field, using thermal feedback from the infrared pyrometer. A distributed-parameter control strategy, with guidance of the torch motion and power by a new weighted attraction strategy to randomly sampled points, is tested on scan-welded flanges. The regulator is validated computationally and experimentally, and its applicability to other scanned processing of materials is considered.
Skip Nav Destination
e-mail: cdoumani@tufts.edu
Article navigation
November 1999
Research Papers
Scanned Orbital Welding: Thermal Modeling and Lumped Adaptive Control
H. Sfetsos,
H. Sfetsos
Department of Mechanical Engineering, Tufts University, Anderson Hall Room 221, Medford, MA 02155
Search for other works by this author on:
J. Angelis,
J. Angelis
Department of Mechanical Engineering, Tufts University, Anderson Hall Room 221, Medford, MA 02155
Search for other works by this author on:
C. Doumanidis
C. Doumanidis
Department of Mechanical Engineering, Tufts University, Anderson Hall Room 221, Medford, MA 02155
e-mail: cdoumani@tufts.edu
Search for other works by this author on:
H. Sfetsos
Department of Mechanical Engineering, Tufts University, Anderson Hall Room 221, Medford, MA 02155
J. Angelis
Department of Mechanical Engineering, Tufts University, Anderson Hall Room 221, Medford, MA 02155
C. Doumanidis
Department of Mechanical Engineering, Tufts University, Anderson Hall Room 221, Medford, MA 02155
e-mail: cdoumani@tufts.edu
J. Pressure Vessel Technol. Nov 1999, 121(4): 393-399 (7 pages)
Published Online: November 1, 1999
Article history
Received:
May 4, 1999
Revised:
June 22, 1999
Online:
February 11, 2008
Citation
Sfetsos, H., Angelis, J., and Doumanidis, C. (November 1, 1999). "Scanned Orbital Welding: Thermal Modeling and Lumped Adaptive Control." ASME. J. Pressure Vessel Technol. November 1999; 121(4): 393–399. https://doi.org/10.1115/1.2883721
Download citation file:
10
Views
Get Email Alerts
Cited By
Measurement of Steam-Generator-Tube Vibration Damping Caused by Anti-Vibration-Bar Supports
J. Pressure Vessel Technol (February 2025)
Related Articles
Modeling of Conduction Mode Laser Welding Process For Feedback Control
J. Manuf. Sci. Eng (August,2000)
Distributed-Parameter Control of the Heat Source Trajectory in Thermal Materials Processing
J. Manuf. Sci. Eng (November,1996)
Lumped Multitorch Control of Welding During Production
J. Eng. Ind (August,1994)
Sensing and Control of Double-Sided Arc Welding Process
J. Manuf. Sci. Eng (August,2002)
Related Chapters
Openings
Guidebook for the Design of ASME Section VIII Pressure Vessels, Third Edition
Openings
Guidebook for the Design of ASME Section VIII Pressure Vessels
Microstructure Evolution and Physics-Based Modeling
Ultrasonic Welding of Lithium-Ion Batteries