B1800HS/DP1180电阻点焊接头组织研究

凌华; 孙浩; 郭亚洲; 樊良伟; 刘成杰; 韦习成

doi:10.7512/j.issn.1001-2303.2020.08.13

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B1800HS/DP1180电阻点焊接头组织研究
Study on the proprieties of B1800HS/DP1180 resistance spot welding joints
2020年50卷第8期页码：62-66
纸质出版：2020
DOI： 10.7512/j.issn.1001-2303.2020.08.13
稿件说明：

移动端阅览

凌华, 孙浩, 郭亚洲, 等. B1800HS/DP1180电阻点焊接头组织研究[J]. 电焊机, 2020,50(8):62-66. DOI： 10.7512/j.issn.1001-2303.2020.08.13.

LING Hua, SUN Hao, GUO Yazhou, et al. Study on the proprieties of B1800HS/DP1180 resistance spot welding joints[J]. Eletric Welding Machine2020, 50(8): 62-66. DOI： 10.7512/j.issn.1001-2303.2020.08.13.

摘要

以B1800HS/DP1180电阻点焊接头为研究对象

利用超景深显微镜观察焊缝宏观形貌

采用光学显微镜分析焊缝显微组织

并用维氏显微硬度计测试接头硬度分布。结果表明

热冲压淬火后的B1800HS组织为细小的板条马氏体。点焊接头熔核良好

其熔核呈非对称状

组织为粗大的板条马氏体

熔核直径6 500.32μm

熔核深度1 868.17μm

热影响区宽度692.63μm

电极压痕深度216.04μm

均符合日本和德国工业标准。接头最薄弱处为亚临界热影响区

其组织为回火马氏体

硬度最低

为271 HV0.3

裂纹通常在此处产生。

Abstract

In this paper

B1800 HS/DP1180 resistance spot welding joint is taken as the research object. The macroscopic morphology of the weld was observed by ultra-depth micro-scopy. The microstructure of the weld was studied via optical microscope（OM） and the hardness distribution of the joint was measured by the Vickers microhardness tester. The results show that the microstructure of B1800 HS is fine lath mart-ensite. The nugget of the spot welded joint is good and asymmetric and the microstructure is thick lath martensite. The nugget diameter is 6 500.32 μm. The nugget depth is 1 868.17μm

the width of the heat affected zone is 692.63 μm and the electrode indentation depth is 216.04 μm

which conforms to the industrial standards of Japan and Germany. The weakest part of the joint is the subcritical heat affected zone

the microstructure is tempered martensite and the hardness is the lowest

271 HV0.3

where cracks are usually produced.