Mechanical Properties and Fracture Mechanism of PHS1800 Hot Formed Steel Resistance Spot Welding Joint

CHEN Jialong; LIU Yan; LI Bo; YE Haiqing

doi:10.3969/j.issn.1674-6457.2025.06.021

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 197-205. DOI: 10.3969/j.issn.1674-6457.2025.06.021

Iron and Steel Forming

Mechanical Properties and Fracture Mechanism of PHS1800 Hot Formed Steel Resistance Spot Welding Joint

CHEN Jialong^a, LIU Yan^b*, LI Bo^a, YE Haiqing^a

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Abstract

The work aims to study the influence of resistance spot welding process parameters on the mechanical properties of welded joints of PHS1800 hot stamping steel and analyze its fracture mechanism. The mechanical properties of resistance spot welded joints of PHS1800 hot forming steel were tested by means of scanning electron microscopy, tensile testing machine and microhardness tester. The fracture mechanism of the joint was systematically analyzed by observing the microstructure of the joint, measuring the tensile strength and microhardness distribution. The influence of welding process parameters on the tensile properties of welded joints was clarified. The results showed that under the parameters of welding current of 11.5 kA, welding time of 0.6 s and electrode pressure of 2.0 kN, the welded joint had the optimal tensile property. Welding time and welding current have a significant influence on the tensile property of the welded joints, while the influence of electrode pressure is relatively small. The fracture mechanism of the welded joints can be divided into pull-out fracture and interface fracture, both of which are brittle fracture. This is mainly because there is martensite in both the base metal and the welded joint. In terms of tensile property, the tensile shear capacity of the joints is better when pull-out fracture occurs. The order of average hardness in each area of the welded joints is the base metal zone (727.47HV0.2)、the nugget zone (687.69HV0.2)、the heat affected zone (632.23HV0.2). This is due to the different content of martensite structure in each area after welding, as well as the formation of tempered martensite and ferrite structures after welding, resulting in lower microhardness in the heat affected zone and nugget zone than in the base metal zone.

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PHS1800 hot-formed steel / resistance spot welding / tensile properties / microhardness / fracture mechanism

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CHEN Jialong, LIU Yan, LI Bo, YE Haiqing. Mechanical Properties and Fracture Mechanism of PHS1800 Hot Formed Steel Resistance Spot Welding Joint[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 197-205 https://doi.org/10.3969/j.issn.1674-6457.2025.06.021

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