Influence of low atmospheric pressures on the arc characteristics of self-shielded flux-core wire

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Abstract The welding characteristics of self-shielded flux-core wire were studied experimentally and theoretically for various atmospheric pressures to study the influence of low atmospheric pressures on the arc characteristics.The results show that the static arc of self-shielded flux-cored wire tends downward but moves upward with increasing welding torch height (arc length). At low atmospheric pressures, the gas density and temperature decrease in the arc region, which reduces the conducting particle density and the welding current. The arc expansion increases the arc column diameter and decreases the electric field intensity. With the increase of the voltage drops in the cathode and anode, the total arc voltage increases. The decrease in the electric field intensity within the arc column at low atmospheric pressures reduces the self-adjustment ability of the arc, the arc stability and the arc column stiffness, which influences the weld formation and joint quality. The welding process parameters for arc welding with self-shielded flux-cored wire at low atmospheric pressures have to be strictly controlled and the arc voltage need to be as low as possible.

Keywords arc characteristic arc welding at low atmospheric pressure self-shielded flux-cored wire arc expansion

ZTFLH:

TG403

Issue Date: 15 July 2015

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	ZHU Zhiming
	FAN Kaiguo
	LIU Han
	WANG Yongdong

Cite this article:

ZHU Zhiming,FAN Kaiguo,LIU Han, et al. Influence of low atmospheric pressures on the arc characteristics of self-shielded flux-core wire[J]. Journal of Tsinghua University(Science and Technology), 2015, 55(7): 734-738.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2015/V55/I7/734

[1] 蒋力培, 王中辉, 焦向东. 水下焊接高压空气环境下GTAW电弧特性 [J]. 焊接学报, 2007, 28(6): 1-4, 113.JIANG Lipei, WANG Zhonghui, JIAO Xiangdong. Characteristics of GTAW arc in underwater welding under high-pressure air condition [J]. Transactions of the China Welding Institution, 2007, 28(6): 1-4, 113. (in Chinese)
[2] 薛龙, 王中辉, 周灿丰, 等. 高压空气环境下TIG焊接机器人关键技术 [J]. 焊接学报, 2006, 27(12): 17-20, 113-114.XUE Long, WANG Zhonghui, ZHOU Canfeng, et al. Key techniques of TIG welding robot in high-pressure air condition [J]. Transactions of the China Welding Institution, 2006, 27(12): 17-20, 113-114. (in Chinese)
[3] 朱志明, 范开果, 潘际銮. 高速铁路钢轨焊接技术的发展和应用 [J]. 焊接, 2013(5): 5-10.ZHU Zhiming, FAN Kaiguo, PAN Jiluan. Development and application of steel-rail welding technology for high-speed railway [J]. Welding & Joining, 2013(5): 5-10. (in Chinese)
[4] 朱志明, 都东, 潘际銮. 无缝线路钢轨原位焊接新方法与装备 [J]. 机械加工: 热加工, 2011(S): 97-105.ZHU Zhiming, DU Dong, PAN Jiluan. In-situ new welding method and equipment for seamless rails [J]. Metal Working: Hot Working, 2011(S): 97-105. (in Chinese)
[5] 宋宏图, 李力, 丁韦, 等. 钢轨自保护药芯焊丝自动窄间隙电弧焊工艺及装备研究 [J]. 电焊机, 2011(3): 91-94.SONG Hongtu, LI Li, DING Wei, et al. Technology and equipment development of self-shielded flux cored narrow gap arc rail welding [J]. Electric Welding Machine, 2011(3): 91-94. (in Chinese)
[6] Bajic D, Vladimirovich Kuzmenko G, Samardzic I. Welding of rails with new technology of arc welding [J]. Metalurgija, 2013, 52(3): 399-402.
[7] 高文. 青藏铁路多年冻土地区铺设无缝线路的技术可行性研究 [J]. 铁道科学与工程学报, 2010, 7(3): 77-81.GAO Wen. Technical feasibility study of continuous welded rail track on permafrost regions along the Qinghai-Tibet railway [J]. Journal of Railway Science and Engineering, 2010, 7(3): 77-81. (in Chinese)
[8] 耿卫民, 邸向军. 寒冷地区钢轨现场移动闪光焊焊接技术研究 [J]. 中国科技信息, 2011(22): 105.GENG Weimin, DI Xiangjun. The mobile flash welding technology study in cold regions [J]. China Science and Technology Information, 2011(22): 105. (in Chinese)
[9] 张向民, 陈秀芳, 曾志平, 等. 青藏铁路无缝线路试验段轨道参数试验 [J]. 铁道科学与工程学报, 2005, 2(6): 40-42.ZHANG Xiangmin, CHEN Xiufang, ZENG Zhiping, et al.Tracks parameters of experiment in experimental section of Qinghai-Tibet railway [J]. Journal of Railway Science and Engineering, 2005, 2(6): 40-42. (in Chinese)
[10] 杨艳玲, 崔成林, 高松福, 等. 青藏铁路钢轨铝热焊缺陷成因分析 [J]. 铁道技术监督, 2011(11): 27-28, 31.YANG Yanling, CUI Chenglin, GAO Songfu, et al. Analyzing the defects of thermite welded joint in Qing-Zang railway [J]. Railway Quality Control, 2011(11): 27-28, 31. (in Chinese)
[11] 安藤弘平, 长谷川光雄. 焊接电弧现象 [M]. 施雨湘, 译. 北京: 机械工业出版社, 1985.Ando K, Hasegawa M. Welding Arc Phenomenon [M]. SHI Yuxiang, trans. Beijing: China Mechine Press, 1985. (in Chinese)
[12] 朱志明, 范开果, 王永东, 等. 低气压对自保护药芯焊丝焊缝成形的影响 [J]. 焊接学报, 2015, 36(2): 1-5.ZHU Zhiming, FAN Kaiguo, WANG Yongdong, et al. Research on weld formation of arc welding with self-shielded flux-cored wire in low atmospheric pressure area [J]. Transactions of the China Welding Institution, 2015, 36(2): 1-5. (in Chinese)