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Materials 2017, 10(2), 106;

Microstructure and Mechanical Properties of Narrow Gap Laser-Arc Hybrid Welded 40 mm Thick Mild Steel

School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan 430073, China
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China
Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Received: 16 November 2016 / Revised: 18 January 2017 / Accepted: 19 January 2017 / Published: 26 January 2017
(This article belongs to the Section Manufacturing Processes and Systems)
Full-Text   |   PDF [9782 KB, uploaded 26 January 2017]   |  


Both laser-arc hybrid welding and narrow gap welding have potential for the fabrication of thick sections, but their combination has been seldom studied. In this research, 40 mm thick mild steel was welded by narrow gap laser-arc hybrid welding. A weld with smooth layer transition, free of visible defects, was obtained by nine passes at a 6 mm width narrow gap. The lower part of the weld has the lowest mechanical properties because of the lowest amount of acicular ferrite, but its ultimate tensile strength and impact absorbing energy is still 49% and 60% higher than those of base metal, respectively. The microhardness deviation of all filler layers along weld thickness direction is no more than 15 HV0.2, indicating that no temper softening appeared during multiple heat cycles. The results provide an alternative technique for improving the efficiency and quality of welding thick sections. View Full-Text
Keywords: narrow gap; hybrid welding; microstructure; mechanical properties narrow gap; hybrid welding; microstructure; mechanical properties

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

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