Experimental Study of Dissimilar Double Pulse Resistance Spot Welded Austenitic Stainless Steel and Weathering Steel

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-04-04 DOI:10.1007/s12540-024-01667-z

Xiqing Li, Wei Liu, Yutong Chen, Zhiguo Zhang, Peiwei Bao

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Abstract

The aim of this study is to prevent thermal cracking in the fusion zone of dissimilar resistance spot weld, which arises due to the electrical and thermal conductivity differences of austenitic steel and weathering steel. Therefore, dissimilar double pulse resistance spot welding experiments were carried out on 4-mm-thick 301LN austenitic stainless steel and 09CuPCrNi weathering steel sheets. The first low-current pulse was used for prewelding, and the second high-current pulse was used for weld generation under a high electrode force. Under these conditions, satisfactory welds that met the welding criterion without thermal cracks or central shrinkage cavities were obtained. In the fusion zone of the double pulse weld, the phases present were lath martensite, δ-ferrite, austenite and phosphorus-rich eutectic. There was a small amount of austenite in this zone, and the eutectic appeared at the grain boundaries. The failure mode of the double pulse weld was pull-out fracture. Finally, the load-bearing capacity of the double pulse weld was 35% greater than that of the single pulse weld.

Graphical Abstract

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奥氏体不锈钢和耐候钢异种双脉冲电阻点焊实验研究

摘要本研究的目的是防止由于奥氏体钢和耐候钢的导电性和导热性不同而在异种电阻点焊熔合区产生热裂纹。因此，对 4 毫米厚的 301LN 奥氏体不锈钢和 09CuPCrNi 耐候钢板进行了异种双脉冲电阻点焊实验。第一个低电流脉冲用于预焊，第二个高电流脉冲用于在高电极力下产生焊缝。在这些条件下，获得了符合焊接标准、无热裂纹或中心收缩空洞的满意焊缝。在双脉冲焊缝的熔合区，存在的相为板条马氏体、δ-铁素体、奥氏体和富磷共晶。该区域存在少量奥氏体，共晶出现在晶界处。双脉冲焊缝的失效模式为拉出断裂。最后，双脉冲焊缝的承载能力比单脉冲焊缝高 35%。图表摘要

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.