The evaluation on performance of narrow- gap welding thick steel plates under the influence of main welding parameters

Keywords: narrow gap MAG welding, thick plate welding, microstructure, design of experiment


This work presents the experimental results of narrow gap butt welding of steel plates with large thickness by using the Metal Active Gas (MAG) welding method.The typical defects are accompanied with this process such as the infusion in the side wall and the porosity due to the narrow gap which affect on the melting process. Thus, some publications noted the results of welding for the thickness up to 20−30 mm and the chamfer angle about 30° using GMAW/MIG, GTAW/TIG, SMAW and new development such as laser – arc hybrid, laser multi- pass technique, super -TIG welding etc. But the production requires the solution to save the costs by the reduction of time, labour and investment keeping the standard quality. That is the aim of this study. In order to improve the quality of weld joint and increase the productivity of the process, is it suggested to develop the innovative welding process, in which the welding voltage – Uw, the translational velocity of the tip – Vt, and rotational velocity of the tip – Vr, are changing. This helped to increase the thickness of steel plates up to 50 mm and the chamfer angle decreased at 15°, providing the satisfied quality of the weld. The micrography study serve as the preliminary proof of this hypothesis.

The microstructures in 4 regions, such as the weld center zone, heat-affected zone (HAZ), parent metal region, and the boundary between the weld metal and the HAZ were examined. The microstructures of 13 positions from different experiments are investigated using the optical microscope (Axiovert 25).These experiments covered all specific points (node) locating accordingly to three layers from bottom to top of the weld joint . The findings proved the welding quality is similar in case of narrow gap but the chamfer angle is twice lower and the thickness is increased. The result of the study enhances the productivity due to saving the labour cost and the welding materials. It is recommended to consider the effect of other factors (such as cooling conditions, dwell time when the arc approaching the side walls) to optimize the weld quality. There is the huge volume of the heavy steel constructions with the thick steel construction and specific narrow gap in industry. The results of this study with the optimization and more deeper evaluation the influence of main parameters of welding process to eliminate the typical defects will be the valuable reco mmendation for the managers and engineers in the production of metallic constructions


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Author Biography

Vu Duong, Duy Tan University

School of Engineering and Technology


Development and Application of High-Efficiency Narrow-Groove Welding Process for Building Steel Frames (2021). JFE Technical Report, 26, 190–192. Available at:

Jia, C., Yan, Q., Wei, B., Wu, C. (2018). Rotating-Tungsten Narrow-Groove GTAW for Thick Plates. Welding Journal, 97 (10), 273–285. doi:

Zhang, C., Li, G., Gao, M., Zeng, X. (2017). Microstructure and Mechanical Properties of Narrow Gap Laser-Arc Hybrid Welded 40 mm Thick Mild Steel. Materials, 10 (2), 106. doi:

Keßler, B., Brenner, B., Dittrich, D., Standfuß, J., Beyer, E., Leyens, C., Maier, G. (2019). Laser Multi-Pass Narrow-Gap Welding – A Promising Technology for Joining Thick-Walled Components of Future Power Plants. MATEC Web of Conferences, 269, 02011. doi:

Masatoshi, M., Daisuke, O., Kensuke, O. (2015). Narrow Gap Gas Metal Arc (GMA) Welding Technologies. JFE Technical Report, 20, 147–153. Available at:

Jun, J.-H., Kim, S.-R., Cho, S.-M. (2016). A Study on Productivity Improvement in Narrow Gap TIG Welding. Journal of Welding and Joining, 34 (1), 68–74. doi:

Li, W., Gao, K., Wu, J., Wang, J., Ji, Y. (2014). Groove sidewall penetration modeling for rotating arc narrow gap MAG welding. The International Journal of Advanced Manufacturing Technology, 78 (1-4), 573–581. doi:

Kim, J.-S., Yi, H.-J. (2017). Characteristics of GMAW Narrow Gap Welding on the Armor Steel of Combat Vehicles. Applied Sciences, 7 (7), 658. doi:

Ngo, T. B., Ha, M. H., Dao, D. T., Nguyen, V. D. (2020). Study on characteristics of narrow gap butt joints with chamfered edges using MAG welding method. Vietnam Mechanical Engineering Journal, 12, 15–22.

Silva, R. H. G. e, Schwedersky, M. B., Santos, A. G. M., Okuyama, M. P. (2020). Effects of the Rotating Arc Technique on the GMA Welding Process. Soldagem & Inspeção, 25. doi:

Jian, X., Wu, H. (2020). Influence of the Longitudinal Magnetic Field on the Formation of the Bead in Narrow Gap Gas Tungsten Arc Welding. Metals, 10 (10), 1351. doi:

Wang, J., Zhu, J., Zhang, C., Wang, N., Su, R., Yang, F. (2015). Development of Swing Arc Narrow Gap Vertical Welding Process. ISIJ International, 55 (5), 1076–1082. doi:

JIS G3101 SS400 steel plate/sheet for general purpose structural steels. Available at:

Flextec® 500X/ Flex Feed® 84 Heavy Duty One-Pak®. Available at:

Technical Specification Sheet. ER70S-6 Carbon Steel Welding Wire. Specification Compliance: AISI/AWS A5.18 & ASME SFA 5.18 ER 70S-6. Unibraze Corporation, Houston. Available at:

Lohse, M., Trautmann, M., Füssel, U., Rose, S. (2020). Influence of the CO2 Content in Shielding Gas on the Temperature of the Shielding Gas Nozzle during GMAW Welding. Journal of Manufacturing and Materials Processing, 4 (4), 113. doi:

Gas Metal Arc Welding. Product and Procedure Selection. Lincoln Electric. Available at:

Axiovert 25/25C/25 CFL. Inverted Microscope. Operating Manual. Zeiss. Available at:

AWS D1.1/D1.1M:2020. An American National Standard. Structural Welding Code- Steel (2019). Available at:

Liu, D., Wei, P., Long, W., Wu, Y., Huang, W. (2021). Narrow gap space contributes to chemical metallurgy of self-shielded arc welding. China Welding, 30 (3), 12–19. Available at:

Sun, Q. J., Hu, H. F., Yuan, X., Feng, J. C. (2011). Research Status and Development Trend of Narrow-Gap TIG Welding. Advanced Materials Research, 308-310, 1170–1176. doi:

Mirakhorli, F., Cao, X., Pham, X. T., Wanjara, P., Fihey, J. L. (2016). Technical Challenges in Narrow-Gap Root Pass Welding during Tandem and Hybrid Laser-Arc Welding of a Thick Martensitic Stainless Steel. Materials Science Forum, 879, 1305–1310. doi:

Jiang, L., Shi, L., Lu, Y., Xiang, Y., Zhang, C., Gao, M. (2022). Effects of sidewall grain growth on pore formation in narrow gap oscillating laser welding. Optics & Laser Technology, 156, 108483. doi:

The evaluation on performance of narrow- gap welding thick steel plates under the influence of main welding parameters

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How to Cite
Duong, V. (2023). The evaluation on performance of narrow- gap welding thick steel plates under the influence of main welding parameters. EUREKA: Physics and Engineering, (1), 112-119.