The study of surface-active element oxygen on flow patterns and penetration in A-TIG welding View Full Text


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Article Info

DATE

2006-06

AUTHORS

Yuzhen Zhao, Yaowu Shi, Yongping Lei

ABSTRACT

A three-dimensional mathematical model was developed to simulate the flow patterns and temperature distributions in a moving A-TIG weld pool of 304 stainless steels with different oxygen content using PHOENICS software. It is shown that the surface-active element, oxygen, is important, because it affects the weld shape by changing the flow patterns in the weld pool. The weld bead penetration and the depth/width ratio increase first sharply and then remain nearly a constant with increasing oxygen content. Depending upon the oxygen contents, three, one, or two vortexes that have different positions, strength, and directions may be found in the weld pool. Oxygen can cause significant changes in the weld shape by varying the sign of the surface tension coefficient. The situation with the maximum surface tension moves from the edge to the center with increasing oxygen content. As oxygen content exceeds a critical value, a positive surface tension coefficient dominates the flow patterns. The vortexes with opposite directions caused by positive surface tension coefficient can efficiently transfer the thermal energy from the arc, creating a deep weld pool. The critical oxygen content increases with the increase of the welding current. More... »

PAGES

485-493

References to SciGraph publications

  • 1985-02. Fluid flow and weld penetration in stationary arc welds in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2001-02. Modeling of the effects of surface-active elements on flow patterns and weld penetration in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 2001-06. Effects of surface active elements on weld pool fluid flow and weld penetration in gas metal arc welding in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 2001-10. Geometry of laser spot welds from dimensionless numbers in METALLURGICAL AND MATERIALS TRANSACTIONS B
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    URI

    http://scigraph.springernature.com/pub.10.1007/s11663-006-0032-9

    DOI

    http://dx.doi.org/10.1007/s11663-006-0032-9

    DIMENSIONS

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