Study on forming mechanism of appearance defects in rotating arc narrow gap horizontal GMAW
Study on forming mechanism of appearance defects in rotating arc narrow gap horizontal GMAW
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DOI：
10.1007/s00170-014-6127-6
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发表时间：
2014-10-01
影响因子：
3.4
通讯作者：
Feng, Jicai
中科院分区：
文献类型：
--
作者：
Guo, Ning;Wang, Meirong;Feng, Jicai
在水平位置焊接过程中，由于金属液向下运动而产生的焊缝成形不良和焊接缺陷是关键问题。在焊接工艺研究成果的基础上，研究了旋转电弧窄间隙水平GMAW典型焊缝外观缺陷的熔滴过渡、熔池行为、温度场、产生原因及解决方案。探讨了产生凹陷、欠切、凸面等缺陷的原因和机理。建立了缺陷与焊接工艺参数之间的关系。外观缺陷的主要原因可分为三类。第一个是焊接过程的热输入过大，第二个是焊接过程不稳定，第三个是母材和填充金属熔合区之间的不匹配。最后确定了旋转电弧窄间隙水平焊的最佳焊接工艺参数。
In horizontal position welding process, the key problem is the poor weld formation and weld defects induced by the downward motion of the molten metal. Base on the research results of welding process, droplet transfer, molten pool behavior, temperature field, reasons, and solutions of the typical weld appearance defects in rotating arc narrow gap horizontal GMAW are studied. The causes and mechanisms of the defects of sagging surface, under cut, and convex surface are explored. The relationship of the defects and the welding parameters is established. The main causes of the appearance defects can be classified into three categories. The first one is the excessive heat input of the welding process, the second one is unstable welding process, and the third one is the mismatch between the fusion area of base metal and filling metal. Finally, the optimum welding parameters of rotating arc narrow gap horizontal welding are determined.