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首页> 外文期刊>International Journal of Heat and Mass Transfer >Molten pool behaviors and their influences on welding defects in narrow gap GMAW of 5083 Al-alloy
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Molten pool behaviors and their influences on welding defects in narrow gap GMAW of 5083 Al-alloy

机译：5083铝合金窄缝GMAW中熔池行为及其对焊接缺陷的影响

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摘要

The welding defects such as porosity and lack-of-fusion is more likely to occur in the narrow gap gas metal arc welding (NG-GMAW) of aluminum alloy. In this study, a three-dimensional transient numerical simulation was carried out to investigate the molten pool behaviors as well as their influences on welding defects. A pulsed arc welding mode was employed, which is accompanied with elliptically symmetric arc models. Three different weld bead surface shapes i.e. the convex, flat and concave surface were achieved both by experiment and simulation with varied welding current. The flow pattern varied significantly due to the different thermal and force conditions. The formation process of lack-of-fusion defect was analyzed and the effect of flow pattern on porosity in all cases were discussed. The results indicate that the upward fluid flow near the sidewall border of molten pool facilitates the formation of lack-of-fusion defect and the downward and backward fluid flow near the sidewalls may induce the porosity. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在铝合金的窄间隙气体金属电弧焊（NG-GMAW）中，容易发生气孔，无熔合等焊接不良。在这项研究中，进行了三维瞬态数值模拟，以研究熔池行为及其对焊接缺陷的影响。采用了脉冲电弧焊模式，并伴随着椭圆对称的电弧模型。通过在变化的焊接电流下进行实验和模拟，获得了三种不同的焊道表面形状，即凸面，平坦面和凹面。由于不同的热力和力条件，流动模式发生了显着变化。分析了缺乏熔合缺陷的形成过程，并讨论了流动方式对所有情况下孔隙率的影响。结果表明，在熔池侧壁边界附近的向上的流体流动促进了熔合缺陷的形成，在侧壁附近的向下和向后的流体流动可能引起孔隙。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第ptaa期|1206-1221|共16页
  • 作者

    Zhu Chenxiao; Cheon Jason; Tang Xinhua; Na Suck-Joo; Cui Haichao;

  • 作者单位

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China;

    Korea Adv Inst Sci & Technol, Dept Mech Engn, 291 Daehak Ro, Daejeon 305701, South Korea;

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China;

    Korea Adv Inst Sci & Technol, Dept Mech Engn, 291 Daehak Ro, Daejeon 305701, South Korea;

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    NG-GMAW; Lack-of-fusion defect; Porosity; Flow pattern; 5083 Al-alloy;

    机译：NG-GMAW;熔合缺陷;孔隙率;流型;5083铝合金;

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