Abstract
Arc appearance is a key factor to sidewall fusion in narrow gap MAG welding (NG-MAG). By observing arc images with high-speed video and weld cross-sections at different arc-sidewall distances in NG-MAG vertical welding, it was discovered that the arc ascended along the groove sidewalls and arc appearance changed from cone to olive when the arc-sidewall distance was relatively small, which contributed to large weld concavity and significant “bead separation” phenomenon. On the other hand, arc length and arc appearance were stable as the arc-sidewall distance was relatively large. Due to not being heated directly and effectively by the arc high temperature zone, the sidewall penetration was low and weld was convex. Only when the arc-sidewall distance was controlled in the range of 2.0 to 3.0 mm, the arc was stable and the weld appearance was concave. Also, the penetration of groove sidewalls was deep. Thus, the sidewall fusion in NG-MAG vertical welding is highly sensitive to process parameters under the low heat input conditions. The laws being discovered above will make a good preparation for the realization of thick high strength low alloy steel (HSLA) plates with NG-MAG automatic welding technology in ocean engineering.
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Acknowledgments
The authors would like to thank the supports of NDRC Major Funded Projects (High-Tech No. [2012]2144 of NDRC Office) and National Natural Science Foundation (51105252).
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Lan, H., Zhang, HJ., Zhao, DL., Chen, AJ., Lin, SY. (2015). Effects of Arc-Sidewall Distance on Arc Appearance in Narrow Gap MAG Welding. In: Tarn, TJ., Chen, SB., Chen, XQ. (eds) Robotic Welding, Intelligence and Automation. RWIA 2014. Advances in Intelligent Systems and Computing, vol 363. Springer, Cham. https://doi.org/10.1007/978-3-319-18997-0_2
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