Classical Control of Gas Metal Arc Welding

K. L. Moore, D. S. Naidu, J. Tyler, S. Ozcelik

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


This paper presents results using classical control techniques to regulate the output of the gas metal arc welding process (GMAW). Using data obtained from open-loop step response tests, a linear, multivariable, lumped-parameter model of the process is derived. This model is used to design first a single-input, single-output controller for current and then a multi-loop controller to simultaneously control current and measured arc voltage to desired setpoints. The multi-loop controller is designed using the relative gain array, which suggests loop pairings that match wire feed speed with current and open-circuit voltage with measured arc voltage. Experimental results, including a disturbance rejection test involving a step change in contact tube-to-workpiece distance, verify the effectiveness of the controller designs.

Original languageEnglish (US)
Title of host publicationASM Proceedings of the International Conference
Subtitle of host publicationTrends in Welding Research
EditorsJ.M. Vitek, S.A. David, J.A. Johnson, H.B. Smartt, T. DebRoy
Number of pages6
StatePublished - Dec 1 1998
EventTrends in Welding Research: Proceedings of the 5th International Conference - Pine Mountain, GA, United States
Duration: Jun 1 1998Jun 5 1998


OtherTrends in Welding Research: Proceedings of the 5th International Conference
Country/TerritoryUnited States
CityPine Mountain, GA


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