Determination of equilibrium wire-feed-speeds for stable gas metal arc welding

Z. H. Rao, J. Zhou, H. L. Tsai

Research output: Contribution to journalArticle

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Abstract

In gas metal arc welding (GMAW), a consumable electrode wire is fed normally at a pre-determined constant speed in order to achieve a stable welding process for given welding conditions. In this article, a comprehensive mathematical model for GMAW was employed to study the interplay among electrode melting; the formation, detachment, and transfer of droplets; and the plasma arc under various welding conditions. It is found that a stable GMAW process can be obtained through a balance between the wirefeed- speed (WFS) and the dynamic electrode melting rate due to the transient behavior of plasma arc. Otherwise, an unstable welding process including electrode burned-back or stick-onto the weld pool could occur. The model-predicted equilibrium WFS varying with welding current and feeding-wire diameter is in good agreement with the published empirical results obtained through a trial-and-error procedure.

Original languageEnglish (US)
Pages (from-to)6651-6664
Number of pages14
JournalInternational Journal of Heat and Mass Transfer
Volume55
Issue number23-24
DOIs
Publication statusPublished - Nov 2012

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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