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NTWV-based sensing keyhole dimension in plasma arc welding

NTWV-based sensing keyhole dimension in plasma arc welding
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摘要 During stable keyhole plasma arc welding, the pilot arc and the transferred arc exist at the meantime, and the arcs can be considered as a composition of two parts inside and outside the nozzle, respectively. Under the mechanical constriction and thermal contraction effects, the inside arc has certain arc length, electron density and arc profile etc. inducing constant tungsten-to-nozzle voltage. However, the arc outside the nozzle diverges at about 5 degrees and has certain characteristics similar to the free arcs. The nozzle-to-workpiece voltage (NTWV) depends mainly on the length of the arc, which gets bigger as increasing of the weld penetration and keyhole size. The NTWV sensor is developed for monitoring NTWV in real time. The welding experiments are designed to get different penetrations and keyhole sizes. It is found that as the weld penetration and the keyhole size increase, NTWV also increases linearly. The NTWV signals can be used as the feedback variable in automatic control of keyhole plasma arc welding. During stable keyhole plasma arc welding, the pilot arc and the transferred arc exist at the meantime, and the arcs can be considered as a composition of two parts inside and outside the nozzle, respectively. Under the mechanical constriction and thermal contraction effects, the inside arc has certain arc length, electron density and arc profile etc. inducing constant tungsten-to-nozzle voltage. However, the arc outside the nozzle diverges at about 5 degrees and has certain characteristics similar to the free arcs. The nozzle-to-workpiece voltage (NTWV) depends mainly on the length of the arc, which gets bigger as increasing of the weld penetration and keyhole size. The NTWV sensor is developed for monitoring NTWV in real time. The welding experiments are designed to get different penetrations and keyhole sizes. It is found that as the weld penetration and the keyhole size increase, NTWV also increases linearly. The NTWV signals can be used as the feedback variable in automatic control of keyhole plasma arc welding.
出处 《China Welding》 EI CAS 2008年第3期1-5,共5页 中国焊接(英文版)
基金 the financial support for this research from the National Natural Science Foundation of China (Grant No 50540420570) the Innovative Conception Fund of Chinese Welding Society (No 07-12-002)
关键词 keyhole plasma arc welding nozzle-to-workpiece voltage PENETRATION KEYHOLE sensor keyhole plasma arc welding, nozzle-to-workpiece voltage, penetration, keyhole, sensor
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  • 1黄从达 胡百喜 等.锅炉蛇型管等离子弧声探焊的微型计算机控制[J].电焊机,1984,(3):10-14.
  • 2胡百喜 黄从达.利用声音进行脉冲等离子弧全位置焊接合金质量控制系统的研究[J].焊接,1980,(5):17-20.
  • 3郑兵.铝合金穿孔型等离子弧焊缝成形稳定性:(博士学位论文)[M].哈尔滨:哈尔滨工业大学,1995..
  • 4李振国 魏青.光富射测量原理与技术[M].北京:中国建材工业出版社,1998.10-11.
  • 5康健,焊接学报,1987年,8卷,1期,17页
  • 6Dong Chunlin,IIW Doc.2 12 -947-99
  • 7Zhang Y M,Welding J,1998年,77卷,6期,57页
  • 8王慧均,博士学位论文,1998年
  • 9郑兵,博士学位论文,1995年
  • 10Zhang Jiuhai,IIW Doc 212610 85,1985年,1页

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