| 脉冲MAG-TIG双电弧打底单面焊双面成形机制分析 |
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| 引用本文： | 刘黎明,周彦彬.脉冲MAG-TIG双电弧打底单面焊双面成形机制分析[J].焊接学报,2019,40(4):8-15. |
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| 作者姓名： | 刘黎明 周彦彬 |
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| 作者单位： | 大连理工大学 材料科学与工程学院,大连,116024;大连理工大学 材料科学与工程学院,大连,116024 |
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| 基金项目： | 国家自然科学基金创新研究群体项目(51621064)；国家自然科学基金面上项目(11375038) |
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| 摘 要： | 基于中厚板打底焊接存在着自动化程度及效率低的问题，采用脉冲熔化极气体保护焊-钨极氩弧焊(MAG-TIG)双电弧热源焊接对板厚为24 mm的Q235-B进行打底焊接单面焊双面成形工艺研究及机制分析. 结果表明，脉冲MAG-TIG双电弧热源打底焊接时，利用TIG电弧与MAG电弧间的电磁力来调节MAG电弧在熔池前端的加热位置，使得一部分电弧热量直接作用于钝边上；结合焊接电弧放电行为与熔池流动分析发现，打底成形稳定性最佳时，利用TIG电弧与熔池的剪切力使得液态金属向后方流动，熔池前端底部液态金属减少，易于平衡稳定，可获得熔透均匀、连续、稳定的打底焊缝背面成形.
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| 关 键 词： | 脉冲MAG-TIG双电弧 打底焊接 单面焊双面成形 高效焊接 机制分析 |
| 收稿时间： | 2018/1/12 0:00:00 |
Mechanism analysis of free formation of backing weld by the pulsed MAG-TIG double arc tandem welding |
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| LIU Liming,ZHOU Yanbin.Mechanism analysis of free formation of backing weld by the pulsed MAG-TIG double arc tandem welding[J].Transactions of The China Welding Institution,2019,40(4):8-15. |
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| Authors: | LIU Liming ZHOU Yanbin |
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| Affiliation: | School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | Due to the low degree of automation and low production efficiency for back welding, the pulse MAG-TIG twin-arc tandem root welding process on thick plate with 24 mm was carried out, welding process and weld seam forming mechanism were investigated. The results indicated that TIG arc had regulation effect on MAG arc heat distribution when arc discharged. Combined with arc plasma behaviors and molten pool state, a result could be found that, when the bead back formation was optimum, TIG arc accelerated the weld pool to flow backwards. Thus the quantity of liquid metal was reduced at the bottom of the molten pool. At this condition, molten pool with balance stress and steady state was obtained, and a sound, uniform and stable surface appearance back weld was acquired. |
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| Keywords: | pulsed MAG-TIG double arc|backing weld|one-side welding with back formation|high efficient welding|mechanism analysis |
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