Effect of strength of steel sheets on tensile shear strength and failure mode of dissimilar joint of spot welds

Q4 Materials Science Welding International Pub Date : 2023-05-04 DOI:10.1080/09507116.2023.2202949

Tohru Okada, H. Ueda, K. Matsuda, Y. Miyazaki, Masanori Yasuyama, H. Fujii

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引用次数: 1

Abstract

Abstract Advanced high strength steel sheet (AHSS) is widely used in the automotive body for weight reduction and the improvement of crash performance. For example, TS1500 MPa class hot stamped steel (1500HS steel) sheet is applied to many vehicle models. However, there is a concern that performance of spot welded joints will decline as steel strength increases. In order to further expand the application of AHSS, it is very important to have knowledge about the characteristics of spot welded joints. In this report, we investigated the tensile shear strength (TSS) of the 1500HS steel sheet. Then, we compared the joint strength and failure position of the same kind material joints and the dissimilar material joints with the 1500HS steel sheet in case of the plug failure. As a result, it was found that TSS of dissimilar material joints depend on base metal strength on lower strength steel side. However, fracture occurred on the 1500HS steel side except for joints with large difference of base metal strength. The mechanism is thought that the effect of strain concentration at the edge of nugget on the 1500HS steel side due to the increase of rotational deformation around the nugget.

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钢板强度对点焊异种接头拉剪强度和失效模式的影响

摘要先进的高强度钢板（AHSS）被广泛应用于汽车车身，以减轻重量和提高碰撞性能。例如TS1500 MPa级热冲压钢板（1500HS钢）应用于许多车型。然而，人们担心点焊接头的性能会随着钢强度的增加而下降。为了进一步扩大AHSS的应用，了解点焊接头的特性是非常重要的。在本报告中，我们研究了1500HS钢板的拉伸剪切强度（TSS）。然后，我们将同种材料接头和异种材料接头与1500HS钢板在插塞失效情况下的接头强度和失效位置进行了比较。结果表明，在低强度钢侧，异种材料接头的TSS取决于母材强度。然而，除了母材强度差异较大的接头外，1500HS钢侧发生了断裂。其机理认为，在1500HS钢侧，由于熔核周围旋转变形的增加，熔核边缘的应变集中效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

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0.00%

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期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.