Effect on Different Groove Forms on Microstructure and Properties of 10CrNi3MoV Steel Joints Welded by Laser-MAG Hybrid Welding

MA Lulu; FAN Qiaofang; LONG Fei; ZHANG Fuqiang; SHI Xiaohui; PU Juan; SUN Yubo; XU Xiangping

doi:10.3969/j.issn.1674-6457.2026.04.013

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (4) : 126-135. DOI: 10.3969/j.issn.1674-6457.2026.04.013

Advanced Joining Technology

Effect on Different Groove Forms on Microstructure and Properties of 10CrNi3MoV Steel Joints Welded by Laser-MAG Hybrid Welding

MA Lulu^1,*, FAN Qiaofang¹, LONG Fei², ZHANG Fuqiang³, SHI Xiaohui³, PU Juan⁴, SUN Yubo⁵, XU Xiangping⁵

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Abstract

The work aims to conduct welding experiments on 10 mm thick 10CrNi3MoV steel by Laser-MAG hybrid welding to analyze the effect of different groove forms on the forming quality, microstructure and mechanical properties of welded joints, and explore the feasibility of laser-MAG hybrid welding for 10 mm thick 10CrNi3MoV steel. Laser-MAG hybrid welding experiments were carried out on 10 mm thick 10CrNi3MoV steel with Y grooves and I grooves, respectively. The microstructure, microhardness and mechanical properties of the joints with the two groove forms were compared. The macroscopic forming of welded joints obtained by Y groove two-pass welding and I groove one-pass welding is better. The weld center of the welded joint is mainly composed of intragranular acicular ferrite, proeutectoid ferrite and a small amount of granular bainite. The heat affected zone is composed of lath martensite and a small amount of granular bainite. The maximum microhardness values of the welded joints obtained by the two groove forms appear in the coarse grain zone of the heat affected zone. The hardness of the weld zone obtained by the Y groove is slightly larger than that of the I groove, and the minimum hardness is located in the softening zone of the heat affected zone. The value is about 230HV10. The average tensile strength of the welded joints obtained by the Y groove and the I groove are 782 MPa and 735 MPa, respectively, and the tensile fracture is at the base metal. The -20 ℃ impact toughness of the weld center obtained by the I groove is greater than that of the Y groove, but the impact toughness of the fusion line and the fusion line +2 mm is less than that of the Y groove. The joint contains no cracks after 180° positive bending and back bending tests, which meets the use requirements. The electrochemical testing on the joint with the I groove shows that the corrosion resistance of the weld seam is better than that of the base metal and heat affected zone.

Key words

laser-MAG hybrid welding / microstructure / mechanical properties / corrosion resistance

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MA Lulu, FAN Qiaofang, LONG Fei, ZHANG Fuqiang, SHI Xiaohui, PU Juan, SUN Yubo, XU Xiangping. Effect on Different Groove Forms on Microstructure and Properties of 10CrNi3MoV Steel Joints Welded by Laser-MAG Hybrid Welding[J]. Journal of Netshape Forming Engineering. 2026, 18(4): 126-135 https://doi.org/10.3969/j.issn.1674-6457.2026.04.013

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