| 焊接速度和焊接电流对竖向高速GMAW驼峰焊缝的影响 |
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| 引用本文： | 张理,郭震,周伟,毕贵军,韩冰.焊接速度和焊接电流对竖向高速GMAW驼峰焊缝的影响[J].焊接学报,2020,41(4):56-61. |
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| 作者姓名： | 张理 郭震 周伟 毕贵军 韩冰 |
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| 作者单位： | 广东省智能制造研究所，广东省现代控制技术重点实验室，广州，510070 |
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| 摘 要： | 运用自主研发的爬壁机器人研究焊接速度和焊接电流对竖向高速熔化极气体保护焊(gas metal arc welding，GMAW)驼峰焊缝的影响. 结果表明，焊接速度或焊接电流超过某一临界值时，竖向高速GMAW会形成驼峰焊缝，且熔池中由电弧压力、熔滴冲击力和重力作用下产生的动量很大的后向液体流是竖向高速GMAW形成驼峰焊缝的主要原因. 同时，焊接速度和焊接电流显著影响驼峰焊缝形貌. 当焊接电流不变时，随焊接速度提高，驼峰焊缝的驼峰间距和驼峰高度先稳定减小，后缓慢减小，而焊缝宽度则稳定减小；当焊接速度不变时，随焊接电流增加，驼峰焊缝的驼峰间距先增加后减小，驼峰高度则是先增加后不变，而焊缝宽度则稳定增加. 此外，焊接速度过小或焊接电流过大均会造成金属液下淌.
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| 关 键 词： | 爬壁机器人 竖向高速GMAW 驼峰焊缝 焊接速度 焊接电流 |
| 收稿时间： | 2019-10-21 |
Effect of welding speed and welding current on humping bead of vertical high-speed GMAW |
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| Affiliation: | Guangdong Key Laboratory of Modern Control Technology, Guangdong Institute of Intelligent Manufacturing, Guangzhou，510070, China |
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| Abstract: | Influence of welding speed and welding current on humping bead in the process of vertical high-speed gas metal arc welding (GMAW) was studied using the independently developed wall-climbing robot. The results show that when the welding speed or welding current exceeds a certain critical value, humping bead will generate in vertical high-speed GMAW. Moreover, the backflow liquid flow with high momentum generated by arc pressure, droplet impact force and gravity in the weld pool is the main reason for the formation of humping bead in vertical high-speed GMAW. Welding speed and current have a significant effect on the morphology of humping bead. When the welding current remains unchanged, as welding speed increases, both the spacing between humps and the height of hump decrease steadily firstly, then the rate of reduction decreases, while the width of bead decreases steadily. When the welding speed remains unchanged, as welding current increases, the spacing between humps increases firstly and then decreases, the height of hump increases firstly and then remains unchanged, while the width of bead increases steadily. In addition, the liquid metal appears to flow down when welding speed is too small or welding current is too large. |
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