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KelmDissertation_112519_Final.pdf (6.87 MB)

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Modeling and Control Strategies for Multiprocess Arc Welding Power Sources

Kelm, Jonathon
http://orcid.org/0000-0003-3183-6276
http://rave.ohiolink.edu/etdc/view?acc_num=case1574659504446931

Abstract Details

2020, Doctor of Philosophy, Case Western Reserve University, EECS - System and Control Engineering.
A modern Multiprocess Arc Welding Power Source (MAWPS) is a Switched-Mode Power Supply (SMPS) that has been designed to produce waveforms used for multiple arc welding processes, such as Shielded Metal Arc Welding (SMAW), Gas Metal Arc Welding (GMAW), Gas Tungsten Arc Welding (GTAW), and Flux-Cored Arc Welding (FCAW). MAWPS control is challenging for a number of reasons, including the complex dynamics of switching power converters, transient conditions encountered in the metal transfer process, wide variations in load impedance, a need for tracking complex reference waveforms, incomplete or inaccurate models of the welding process itself, the difficulty of addressing the needs of several welding processes using a single machine, an electrically harsh environment with high levels of electromagnetic noise, and health and safety concerns. In this work, models of the equipment in a welding setup are developed that can be used for analysis and control system design. The models are used to develop a simulation environment and a new control strategy for a welding power source from Lincoln Electric, using Sliding Mode Control (SMC). While SMC has been applied to SMPS elsewhere in the literature, this work focuses on the particular needs of the welding power source and incorporates output current, voltage, and power reference tracking, switching frequency control, and output constraints. A hardware implementation of the SMC strategy is described, and its performance is compared against the existing control system and computer simulations. While some implementation details still need to be worked out, the SMC strategy is shown to be feasible to implement and to provide significant improvements in the current, voltage, and power tracking performance. These improvements should have a direct impact on the welding performance of the Multiprocess Arc Welding Power Source (MAWPS).
Kenneth Loparo, Ph.D. (Advisor)
Vira Changkong, Ph.D. (Committee Member)
Robert Gao, Ph.D. (Committee Member)
Wei Lin, Ph.D. (Committee Member)
174 p.
Electrical Engineering
SMPS; welding; sliding mode control

Recommended Citations

Citations

  • Kelm, J. (2020). Modeling and Control Strategies for Multiprocess Arc Welding Power Sources [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1574659504446931

    APA Style (7th edition)

  • Kelm, Jonathon. Modeling and Control Strategies for Multiprocess Arc Welding Power Sources. 2020. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1574659504446931.

    MLA Style (8th edition)

  • Kelm, Jonathon. "Modeling and Control Strategies for Multiprocess Arc Welding Power Sources." Doctoral dissertation, Case Western Reserve University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1574659504446931

    Chicago Manual of Style (17th edition)

case1574659504446931
861
© 2019, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.