Microstructure and mechanical properties analysis of resistance spot welded joints of 22MnB5/DP980 dissimilar steel

WANG Hailin; ZHAN Hongshun; WANG Jinfeng; ZHANG Yuanhao; YANG Siwei

doi:10.7513/j.issn.1004-7638.2025.06.021

Volume 46 Issue 6

Dec. 2025

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WANG Hailin, ZHAN Hongshun, WANG Jinfeng, ZHANG Yuanhao, YANG Siwei. Microstructure and mechanical properties analysis of resistance spot welded joints of 22MnB5/DP980 dissimilar steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 172-178. doi: 10.7513/j.issn.1004-7638.2025.06.021

Citation:

WANG Hailin, ZHAN Hongshun, WANG Jinfeng, ZHANG Yuanhao, YANG Siwei. Microstructure and mechanical properties analysis of resistance spot welded joints of 22MnB5/DP980 dissimilar steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 172-178. doi: 10.7513/j.issn.1004-7638.2025.06.021

Citation:

WANG Hailin, ZHAN Hongshun, WANG Jinfeng, ZHANG Yuanhao, YANG Siwei. Microstructure and mechanical properties analysis of resistance spot welded joints of 22MnB5/DP980 dissimilar steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 172-178. doi: 10.7513/j.issn.1004-7638.2025.06.021

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Microstructure and mechanical properties analysis of resistance spot welded joints of 22MnB5/DP980 dissimilar steel

doi: 10.7513/j.issn.1004-7638.2025.06.021

School of Automotive Materials, Hubei University of Automotive Technology, Shiyan 442002, Hubei, China

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Received Date: 2025-09-10
Accepted Date: 2025-10-11
Rev Recd Date: 2025-10-09

Available Online: 2025-12-31

Publish Date: 2025-12-31

Abstract

Abstract

Resistance spot welding experiments were conducted on 1.2 mm thick 22MnB5 and 1.6 mm thick DP980 dissimilar steels using MD-40 medium-frequency inverter spot welding equipment. By integrating techniques including tensile testing, microhardness measurements, and metallographic observations, the influences of varying welding currents and times on the formation quality, microstructure, and mechanical properties of 22MnB5/DP980 spot welded joints were investigated. The results indicated that with the increase of welding current, the tensile shear force of the joint continued to rise, reaching a peak of 16.81 kN at a welding current of 11 kA. Similarly, extending the welding time also continuously increased the tensile shear force, which peaked at 17.23 kN when the welding time was 400 ms. Compared with the welding current, welding time has a more significant effect on improving the tensile shear force of the joint. However, when the welding time reached 400 ms, electrode adhesion to the material and spattering occurred, thereby exacerbating electrode wear. Considering comprehensively the effects of welding current and time on the tensile properties of 22MnB5/DP980 welded joints, the relatively optimal welding parameters were determined as follows: electrode pressure of 0.2 MPa, welding current of 11 kA, and welding time of 350 ms. Softening occurred in the heat-affected zone (HAZ) on the DP980 steel side of the welded joint, and the hardness of the nugget zone was higher than that of the HAZ. Moreover, the larger the welding current, the more severe the softening of the HAZ on this side. In contrast, hardening took place in the HAZ on the 22MnB5 steel side, where the hardness was higher than that of the nugget zone. The microhardness values of the welded joint in descending order were as follows: HAZ on the 22MnB5 steel side, nugget zone, and HAZ on the DP980 steel side. The fracture mode of the 22MnB5/DP980 welded joint was partial nugget pull-out fracture, where the nugget was not completely pulled out. During the pull-out process, the 22MnB5 side base metal tore around the nugget, while no tearing observed on the DP980 side, and the nugget remained attached to the DP980 steel side.
- resistance spot welding,
- dissimilar steel,
- microstructure,
- mechanical properties

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References(20)

References

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