Investigation of failure mechanism of dissimilar resistance spot welding of steels

IF 1.3 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Emerging Materials Research Pub Date : 2023-06-01 DOI:10.1680/jemmr.22.00224

M. Prabhakaran, D. Jeyasimman, M. Varatharajulu

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引用次数: 1

Abstract

Austenitic and Duplex Stainless steel was majorly preferred for the heat exchangers and the chemical containers. This research work proposed to investigate the failure mechanism of dissimilar welded joints of AISI 347 and DSS 2205. The welded specimens were investigated under tensile shear test, cross tension test, coach peel test, and micro-hardness test. The specimen absorbed a maximum tensile shear load of 18 kN during the tensile shear test and the failure mode was button pull out with brittle fracture. The test sample absorbed a load of 15.1 kN during the cross tension test and the failure mode was button pull out with brittle fracture. During coach peel test, the sample absorbed a maximum load of 4 kN and ductile fracture was witnessed at the vicinity of the nugget. The failure mode in coach peel test was button pull out type. The microhardness test recorded a maximum hardness of 312.8 HV which is 78.74% and 7.1% higher than the base metal hardness values of AISI 347 and AISI 2205 respectively. The specimen failed under pull out failure mode in all the tests and hence the weld zone was intact in all the specimen arrangement and loading conditions.

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钢异种电阻点焊失效机理的研究

奥氏体和双相不锈钢主要用于热交换器和化学容器。本研究旨在探讨AISI 347与DSS 2205异种焊接接头的失效机理。对焊接试样进行了拉伸剪切试验、交叉拉伸试验、教练剥离试验和显微硬度试验。试件在拉伸剪切试验过程中最大受拉剪切载荷为18 kN，破坏模式为扣拔脆性断裂。试件在交叉拉伸试验中承受了15.1 kN的载荷，破坏模式为拉扣脆性断裂。在剥离试验中，试样最大承受荷载为4kn，在熔核附近出现韧性断裂。车厢剥离试验的失效模式为扣拔式。显微硬度测试的最大硬度为312.8 HV，分别比AISI 347和AISI 2205基体硬度值高78.74%和7.1%。在所有试验中，试样均在拉出破坏模式下破坏，因此在所有试样布置和加载条件下，焊缝区都是完整的。

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来源期刊

Emerging Materials Research MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

9.10%

发文量

期刊介绍： Materials Research is constantly evolving and correlations between process, structure, properties and performance which are application specific require expert understanding at the macro-, micro- and nano-scale. The ability to intelligently manipulate material properties and tailor them for desired applications is of constant interest and challenge within universities, national labs and industry.