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焊接电流对CR590T/340Y镀锌双相钢电阻点焊焊缝成型、微观组织及力学性能的影响

Effect of Welding Current on Weld Formation, Microstructure, and Mechanical Properties in Resistance Spot Welding of CR590T/340Y Galvanized Dual Phase Steel.

作者信息

Zhang Xinge, Yao Fubin, Ren Zhenan, Yu Haiyan

机构信息

School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China.

College of Materials Science and Engineering, Jilin University, Changchun 130025, China.

出版信息

Materials (Basel). 2018 Nov 17;11(11):2310. doi: 10.3390/ma11112310.

DOI:10.3390/ma11112310
PMID:30453641
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6265945/
Abstract

During resistance spot welding, the welding current is the most important process parameter, which determines the welding heat input and then has a great influence on the welding quality. In present study, the CR590T/340YDP galvanized dual phase steel widely used as automobile material was carried out using resistance spot welding. The effect of welding current on the weld formation, microstructure, and mechanical properties was studied in detail. It was found that the quality of weld appearance decreased with the increase of welding current, and there was a Zn island on the weld surface. The microstructure of the whole resistance spot welded joint was inhomogeneity. The nugget zone consisted of coarse lath martensite and a little of ferrite with the columnar crystal morphology, and the microstructure of weld nugget became coarser when the welding current was higher. There was an optimum welding current value and the tensile strength reached the maximum. This investigation will provide the process guidance for automobile body production.

摘要

在电阻点焊过程中，焊接电流是最重要的工艺参数，它决定了焊接热输入，进而对焊接质量有很大影响。在本研究中，对广泛用作汽车材料的CR590T/340YDP镀锌双相钢进行了电阻点焊。详细研究了焊接电流对焊缝成形、微观组织和力学性能的影响。结果发现，焊缝外观质量随焊接电流的增加而下降，焊缝表面存在锌岛。整个电阻点焊接头的微观组织不均匀。熔核区由粗大的板条马氏体和少量铁素体组成，呈柱状晶形态，焊接电流越大，焊缝熔核的组织越粗大。存在一个最佳焊接电流值，此时拉伸强度达到最大值。本研究将为汽车车身生产提供工艺指导。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7172/6265945/2438b6ba5c58/materials-11-02310-g015.jpg
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