To solve the problem of zinc to the weld quality of galvanised sheet, alloy elements (Cu, Nb, Y) have been added to combine with zinc to form stable compounds during welding. The structure and properties of CuZn, NbZn3 and YZn compounds were calculated by first-principles. The calculation results show that all three elements form a stable alloy with Zn. Among the alloys formed, CuZn has the best mechanical properties. MIG welding experiments of galvanised sheet were conducted to verify the effects of Cu addition on the weld seam formation. The experimental results show that the addition of Cu powder has little influence on the macro-morphology of the weld. In the centre of the weld, ferrite structure is refined and micro-hardness is improved.

中文翻译：

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合金元素对镀锌板焊缝影响的第一性原理研究

为了解决锌对镀锌板焊接质量的影响，在焊接过程中加入合金元素（Cu、Nb、Y）与锌结合形成稳定的化合物。利用第一性原理计算了CuZn、NbZn3和YZn化合物的结构和性质。计算结果表明，三种元素均与Zn形成稳定的合金。在形成的合金中，CuZn 具有最好的机械性能。进行了镀锌板的 MIG 焊接实验，以验证 Cu 添加对焊缝形成的影响。实验结果表明，Cu粉的加入对焊缝宏观形貌影响不大。在焊缝中心，铁素体组织细化，显微硬度提高。