拉伸试验中熔核周围板变形对电阻点焊搭接抗拉剪切强度的影响

Q4 Materials Science

Welding International Pub Date : 2023-06-15 DOI:10.1080/09507116.2023.2222958

Takanori Kitamura, Tetsuya Akiyama, Mitsuhiro Imamura, Tomoya Kawabata, Atsuro Uemura, Chinatsu Mihara, Koki Iwatani

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引用次数: 0

摘要

摘要:电阻点焊应用于汽车车身装配。拉伸剪切试验是焊接接头强度评定方法之一。在搭接节点的拉伸剪切试验中，由于载荷轴的偏移，通常会导致节点发生旋转变形。研究了电阻点焊搭接接头旋转变形对其抗拉剪切强度的影响。采用高强度钢板HT590。首先，拉伸剪切试验只采用电阻点焊(普通)和试样，其中焊接接头部分夹在两个钢块之间，以抑制旋转变形。对于夹在钢块之间的试样，制备了与拉伸方向平行(P)的约束点和与拉伸方向垂直(V)的约束点。在拉伸剪切试验中，采用五种方式改变钢块长度。结果表明:随着钢块长度的增加，其抗拉剪切强度增大;而抑制旋转变形对拉伸抗剪强度的影响不显著。在搭接的拉伸剪切试验中，除了旋转变形外，还会出现搭接板的开口。因此，采用在搭接边缘夹两个钢块的试样进行拉伸剪切试验，以抑制板的开口。用有限元法对实验进行了再现和分析。结果表明:与正常试件相比，变形抑制试件的抗拉剪切强度有所提高;换句话说，很明显，板开度的抑制对拉伸抗剪强度的增加有影响。上述结果表明，抑制板开度对提高抗拉抗剪强度是有效的。关键词:电阻点焊;高抗拉强度钢;抗拉剪切强度

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Effect of plate deformation around the nugget during tensile test on tensile shear strength of resistance spot welded lap joints

AbstractAbstractResistance spot welding is used in automobile body assembly. Tensile shear test is one of the strength evaluation methods for welded joints. Generally, in tensile shear tests of lap joints, rotational deformation occurs in the joint due to offset of the load axis. In this paper, the effect of rotational deformation of resistance spot welded lap joints on tensile shear strength was investigated. A high-strength steel plate HT590 was used. First, tensile shear tests were conducted using only resistance spot welding (Normal) and a specimen in which the welded joint part was sandwiched between two steel blocks to suppress rotational deformation. For the specimens sandwiched between steel blocks, a specimen was prepared with a constrained point parallel (P) to the tensile direction and a specimen with a constrained point vertical (V) to the tensile direction. And the length of the steel blocks was varied in five ways for the tensile shear test. The results showed that the tensile shear strength increased as the length of the steel block increased. However, the suppression of rotational deformation didn’t have a significant effect on tensile shear strength. In tensile shear tests of lap joints, opening of the lap plates occurs in addition to rotational deformation. Therefore, tensile shear tests were conducted using a specimen with two steel blocks sandwiched at the edge of the lap to suppress the opening of the plates. The experiment was reproduced and investigated by FEM analysis. The results showed that the tensile shear strength increased in the deformation-suppressed specimens compared to Normal specimens. In other words, it is clear that the suppression of plate opening has an effect on the increase in tensile shear strength. The above results indicate that suppression of plate opening is effective in increasing tensile shear strength.Keywords: Resistance spot weldinghigh tensile strength steeltensile shear strengthrotational deformationopening of the platesFEM analysistensile shear test

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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

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.