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Examination of post-heating conditions to improve CTS in resistance spot-weld joints

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Abstract

In recent years, application of high-strength steel in automobile bodies has been expanded to improve collision safety and fuel efficiency. However, it has been reported that for high-strength steels with strengths of at least 780 MPa, cross-tension strength (CTS) in resistance spot-weld joints decreases as steel strength increases. Methods of improving joint strength include post-heating. Although many studies have been conducted on post-heating, the temperature and microstructural changes required by post-heating to improve joint strength, such as a decrease in hardness and relaxation of solidification segregation elements, remain unclear. The effect of post-heating on CTS was investigated through resistance spot-weld joints of 1.5-GPa-class hot-stamped steel. We analyzed the temperature at the nugget edge during post-heating by using SORPAS, and conducted a reproducible thermal-cycle test simulating post-heating to determine the temperature range and microstructural changes necessary to improve joint strength. CTS was improved in two regions by varying the current ratio. In the tempering region, CTS varied in a wide range, and the current ratio varied in a narrow range. In the solidification segregation relaxation region, CTS did not vary, and the current ratio varied in a wide range. To improve CTS by tempering with post-heating, all solute carbon in martensite must be segregated or precipitated; the temperature for tempering with post-heating should be between 630 and 720 °C. To improve CTS by solidification segregation relaxation with post-heating, the P-enriched area fraction must be reduced; the temperature range for solidification segregation relaxation with post-heating should be between 860 and 1450 °C.

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Authors and Affiliations

  1. NIPPON STEEL CORPORATION, 20-1 Shintomi, Futtsu-Shi, Chiba, 293-8511, Japan

    Taiga Taniguchi, Seiji Furusako & Shinji Kodama

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  1. Taiga Taniguchi
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  2. Seiji Furusako
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  3. Shinji Kodama
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Correspondence to Taiga Taniguchi.

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Recommended for publication by Commission III - Resistance Welding, Solid State Welding, and Allied Joining Process

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Taniguchi, T., Furusako, S. & Kodama, S. Examination of post-heating conditions to improve CTS in resistance spot-weld joints. Weld World 67, 1359–1366 (2023). https://doi.org/10.1007/s40194-023-01477-8

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