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首页> 外文期刊>Journal of Manufacturing Processes >Behaviors and effects of Zn coating on welding-brazing process of Al-Steel and Mg-steel dissimilar metals
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Behaviors and effects of Zn coating on welding-brazing process of Al-Steel and Mg-steel dissimilar metals

机译：锌涂层对铝钢和镁钢异种金属焊接钎焊过程的影响

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摘要

The behaviors and effects of Zn-coating on the welding-brazing processes of steel with aluminum and magnesium were investigated by Cold Metal Transfer (CMT) arc. The behaviors of Zn-coating at the very beginning of burning and during the spreading of the liquid aluminum and liquid magnesium droplet over the steel plate were observed respectively. The effects of Zn-coating on the wetting process of liquid droplets and on the fracture of welding-brazing joints were analyzed. The effects of Zn-coating on joining mechanisms and tensile load of Al-steel joints and Mg-steel joint were compared and analyzed. For Al-steel, Mg-steel, some common behaviors can be found, the main effect of Zn is its evaporation which decreases the temperature at the interface to prevent steel from melting and makes the steel to expose the fresh metallic surface which is much easier to be spread by a liquid droplet than an oxidized surface. Zn-coating improves the wettability of liquid Al or liquid Mg over the steel surface. However, some effects of zinc coating on wetting behavior, joining mechanisms and tensile load of Al-steel joints and Mg-steel joint are still different. For Al-steel arc, Zn-rich triangle zone is not formed by driving the liquid Zn from inside and accumulated at the toe, rather it is formed by the diffusion of the liquid Zn from outside Zn-enriched periphery into the droplet. In the case of Mg-steel arc, the Zn-rich zone forms partly due to the accumulation of Zn driven from the center during the Zn evaporation. For Al-steel joint, Zinc coating has not reacted to form the interface layer between Al weld metal and steel, however, zinc coating reacted to form the interface layer between Mg weld metal and steel. Zinc coating improved the strength of Al-steel joints, but, it is not beneficial to the strength of Mg-steel joint. (C) 2018 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.
机译：通过冷金属转移（CMT）电弧研究了镀锌层对铝铝镁合金钢钎焊过程的影响。分别在燃烧开始时和液态铝液滴和液态镁液滴在钢板上扩散期间观察了锌涂层的行为。分析了镀锌对液滴润湿过程和对焊接-钎焊接头断裂的影响。比较分析了镀锌层对铝钢接头和镁钢接头的结合机理及拉伸载荷的影响。对于铝钢，镁钢，可以发现一些常见的行为，锌的主要作用是其蒸发，降低了界面温度以防止钢熔化，并使钢暴露出新鲜的金属表面，这更容易会被液滴散布，而不是被氧化的表面。镀锌可改善液态Al或液态Mg在钢表面的润湿性。然而，镀锌层对铝钢接头和镁钢接头的润湿行为，接头机理和拉伸载荷的影响仍然不同。对于铝钢电弧，不是通过从内部驱动液体Zn并在脚趾处积累而形成富锌三角形区域，而是由液态Zn从富含Zn的外围扩散到液滴中形成的。在Mg钢电弧的情况下，形成富锌区的部分原因是在Zn蒸发过程中从中心驱动的Zn积累。对于铝钢接头，镀锌层没有反应形成铝焊缝金属与钢之间的界面层，但是，镀锌层反应却形成了镁焊缝金属与钢之间的界面层。镀锌可以提高铝-钢接头的强度，但对镁-钢接头的强度不利。 （C）2018年制造工程师学会。由Elsevier Ltd.出版。保留所有权利。

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  • 来源
    《Journal of Manufacturing Processes》 |2018年第1期|674-688|共15页
  • 作者

    Cao R.; Chang J. H.; Huang Q.; Zhang X. B.; Yan Y. J.; Chen J. H.;

  • 作者单位

    Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Langongping 287 Rd, Qilihe Dist 730050, Peoples R China;

    Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Langongping 287 Rd, Qilihe Dist 730050, Peoples R China;

    Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Langongping 287 Rd, Qilihe Dist 730050, Peoples R China;

    Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Langongping 287 Rd, Qilihe Dist 730050, Peoples R China;

    Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Langongping 287 Rd, Qilihe Dist 730050, Peoples R China;

    Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Langongping 287 Rd, Qilihe Dist 730050, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Welding-brazing; Magnesium/aluminum alloy; Zinc coating;

    机译：焊接钎焊;镁/铝合金;镀锌;

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