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Welding polarity effects on weld spatters and bead geometry of hyperbaric dry GMAW

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Abstract

Welding polarity has influence on welding stability to some extent, but the specific relationship between welding polarity and weld quality has not been found, especially under the hyperbaric environment. Based on a hyperbaric dry welding experiment system, gas metal arc welding(GMAW) experiments with direct current electrode positive(DCEP) and direct current electrode negative(DCEN) operations are carried out under the ambient pressures of 0.1 MPa, 0.4 MPa, 0.7 MPa and 1.0 MPa to find the influence rule of different welding polarities on welding spatters and weld bead geometry. The effects of welding polarities on the weld bead geometry such as the reinforcement, the weld width and the penetration are discussed. The experimental results show that the welding spatters gradually grow in quantity and size for GMAW with DCEP, while GMAW with DCEN can produce fewer spatters comparatively with the increase of the ambient pressure. Compared with DCEP, the welding current and arc voltage waveforms for DCEN is more stable and the distribution of welding current probability density for DCEN is more concentrated under the hyperbaric environment. When the ambient pressure is increased from 0.1 MPa to 1.0 MPa, the effects of welding polarities on the reinforcement, the weld width and the penetration are as follows: an increase of 0.8 mm for the weld reinforcement is produced by GMAW with DCEN and 1.3 mm by GMAW with DCEP, a decrease of 7.2 mm for the weld width is produced by DCEN and 6.1 mm by DCEP; and an increase of 3.9 mm for the penetration is produced by DCEN and 1.9 mm by DCEP. The proposed research indicates that the desirable stability in the welding procedure can be achieved by GMAW with DCEN operation under the hyperbaric environment.

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Authors and Affiliations

  1. Opto-Mechatronic Equipment Technology Beijing Area Major Laboratory, Beijing Institute of Petrochemical Technology, Beijing, 102617, China

    Long Xue, Jinming Wu, Junfen Huang, Jiqiang Huang, Yong Zou & Jian Liu

Authors
  1. Long Xue
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  2. Jinming Wu
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  3. Junfen Huang
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  4. Jiqiang Huang
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  5. Yong Zou
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  6. Jian Liu
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Corresponding author

Correspondence to Junfen Huang.

Additional information

Supported by National Natural Science Foundation of China(Grant No. 51275051), and Innovation and Improvement Plan of Beijing Education Commission, China(Grant No.TJSHG201510017023)

Biographical notes

XUE Long, born in 1966, is currently a professor at Beijing Institute of Petrolchemical Technology, China. He received his PhD degree from China University of Petroleum, China, in 2014. His research interests include underwater welding, man-machine system, robotics and ocean engineering.

WU Jinming, born in 1990, is currently a master candidate at Opto-Mechatronic Equipment Technology Beijing Area Major Laboratory, Beijing Institute of Petrolchemical Technology, China.

HUANG Junfen, born in 1975, a lecturer at Beijing Institute of Petrolchemical Technology, China. She received her PhD degree from Beijing University of Technology, China, in 2005. Her research interests include underwater welding, robotics and ocean engineering.

HUANG Jiqiang, born in 1971, an associate professor at Beijing Institute of Petrolchemical Technology, China. He received his PhD degree from Beijing University of Technology, China, in 2004. His research interests include underwater welding, welding automation.

ZOU Yong, born in 1976, is currently a lab master at Beijing Institute of Petrochemical Technology, China. He received his master degree on mechatronics at China University of Petroleum, China, in 2004.

LIU Jian, born in 1988, is currently a master candidate at Opto-Mechatronic Equipment Technology Beijing Area Major Laboratory, Beijing Institute of Petrolchemical Technology, China.

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Xue, L., Wu, J., Huang, J. et al. Welding polarity effects on weld spatters and bead geometry of hyperbaric dry GMAW. Chin. J. Mech. Eng. 29, 351–356 (2016). https://doi.org/10.3901/CJME.2015.1104.131

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  • DOI: https://doi.org/10.3901/CJME.2015.1104.131

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