Measurement of calibrated recursive analytic in the gas tungsten arc weld pool model

S. J. Wu, H. M. Gao, W. Zhang, Y. M. Zhang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

An analytic model based on a single-ellipsoidal stationary heat source can estimate the penetration in gas tungsten arc welding (GTAW) accurately with the calibration from the 3D measurements of the weld pool surface. However, the computation needed for the integration associated with the analytic model increases with time and when the current is changed; its real-time application is no longer feasible. To address this challenge, the basic principles on which the analytic model was derived were analyzed to rebuild a modified analytic model. In this rebuilt model, the temperature distribution was expressed into two terms: one as a function of an earlier temperature distribution, and the other as a function of the newly applied arc power. With this rebuilt analytic model, a recursive solution was facilitated such that the computation does not increase/change as the welding time increases and the desirable real-time computation and calibration can be obtained. To further reduce the computation time, a model was fit for the earlier distribution as given by discrete points such! that its function can be analytically evaluated to minimize the needed online computation. Experiments were performed where cross sections of the welds were used to verify the novel recursive model calibrated by the measurements of the 3D weld pool surface.

Original languageEnglish
Pages (from-to)108s-119s
JournalWelding Journal
Volume97
Issue number4
DOIs
StatePublished - Apr 2018

Bibliographical note

Publisher Copyright:
© Copyright 2018 Panasonic Corporation of North America. All rights reserved.

Funding

This work was funded in part by the National Science Foundation under grant NSF 1208420 and the China Scholarship Council.

FundersFunder number
China Scholarship Council
National Science Foundation (NSF)1208420

    Keywords

    • Analytic Model
    • Gas Tungsten Arc Welding (GTAW)
    • Three-Dimensional Vision (3D)
    • Weld Penetration
    • Weld Pool

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys

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