A Study on Parameter Optimization for Circumferential Gas Tungsten Arc (GTA) Welding of Small Pipes considering Backing Gas Pressure: Part 2: Process Optimization

Na, Suck-Joo; Lho, T.-J.

doi:10.1243/pime_proc_1996_210_089_02

Cited by 1 publication

(2 citation statements)

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“…We found this to be a convenient alternative to other ways of computing free boundaries. Thus, our optimization problem is given by (2) with φ = {ϕ, LG } and cost functional (15).…”

Section: Cost Functionalmentioning

confidence: 99%

“…It appears therefore plausible that modifying these phenomena by adjusting parameters of the heat source may lead to welds with more desirable properties. Optimization approaches are now routinely used in various areas of science and engineering; however, despite the ubiquity of welding in modern industry, few attempts have been made at rigorous and systematic optimization of welding processes (e.g., [2]). This seems due to the great complexity of the mathematical models describing the thermo-fluid phenomena occurring in such processes.…”

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confidence: 99%

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Adjoint-based optimization of thermo-fluid phenomena in welding processes

et al. 2009

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A method is developed for optimizing the complex thermo-fluid phenomena that occur in welding processes where fluid convection is present. A mathematical model of a typical welding problem which includes conservation of mass, momentum and energy, and assumes that the process is steady in the frame of reference moving with the heat source is considered. An optimal control problem in which the heat input from the heat source is determined to ensure a prescribed geometry of the weld is formulated and solved. The problem is solved with a gradient-based optimization approach in which the gradient (sensitivity) of the cost functional with respect to the control variables is determined using a suitably defined adjoint system. An important aspect of the problem is that it is of the free-boundary type. Therefore it is necessary to use methods of the shape calculus to derive the adjoint equations. A number of computational results which validate our approach and feature qualitatively different flow patterns in problems with different material properties are presented.

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“…We found this to be a convenient alternative to other ways of computing free boundaries. Thus, our optimization problem is given by (2) with φ = {ϕ, LG } and cost functional (15).…”

Section: Cost Functionalmentioning

confidence: 99%

mentioning

confidence: 99%