Mechanical Properties of Resistance Spot Welded Components of High Strength Austenitic Stainless Steel

doi:10.1016/j.jmst.2015.11.023

J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (6): 561-565.DOI: 10.1016/j.jmst.2015.11.023

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Mechanical Properties of Resistance Spot Welded Components of High Strength Austenitic Stainless Steel

Wei Liu^{1, *}, Hailong Fan¹, Xiangzhong Guo¹, Zhihong Huang², Xiaohui Han³

1 School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; 2 CRRC Nanjing Puzhen Co., Ltd., Nanjing 210031, China; 3 CRRC Qingdao Sifang Co., Ltd., Qingdao 266000, China

Received:2014-12-16 Online:2016-06-10
Contact: Corresponding author. M.E., Ph.D.; Tel.: +86 10 51683938. (W. Liu). E-mail address: weiliu@bjtu.edu.cn (W. Liu).
Supported by:
This research was funded by the Scientific Research and Development Projects of China Railway Corporation (2011J105-B).

Abstract

Abstract: Resistance multi-spot welding (MSW) in column, triangle and tetragonal symmetry arrangements was prepared using cold-rolled 301L high-strength sheets, and their static and fatigue properties were investigated. The effects of spot welds on the fracture strengths and fatigue limits were discussed. The results show that the static strengths can be estimated using an inherent linear relationship formula of the load versus the welding area. It was based on the 28%-33% volume fraction of α′ martensite induced at the interfacial spot weld fracture because of the failure deformation. The fatigue limits of the MSW nonlinearly increase with the number of spot welds. The arrangement of spot welds in the MSW significantly affects the average fatigue limit of each spot weld; its 26% maximum reduction occurred in the triangle, and the interaction stress between spot welds led to its 18% reduction in the tetragonal symmetry. The calculated fatigue stress of all MSW loadings with their mean fatigue limits was 230-270?MPa.

Key words: 301L-HT sheet, Multi-spot welding, Spot weld arrangement, Static-strength prediction, Fatigue limit

Wei Liu, Hailong Fan, Xiangzhong Guo, Zhihong Huang, Xiaohui Han. Mechanical Properties of Resistance Spot Welded Components of High Strength Austenitic Stainless Steel[J]. J. Mater. Sci. Technol., 2016, 32(6): 561-565.

Figures/Tables 7

Spot welds in 60?mm space and 30?mm to edges for all MSW specimens.

(a) Microstructure of a spot-weld and (b) an interfacial failure spot-weld.

(a) Tensile shear curves and (b) curves of ultimate loads versus the number of spot welds of the MSW.

Linear relationship of static strength vs the total shear fracture welding area.

Calculated fatigue limits of the MSW one to four spot welds and their fatigue fracture modes.

Curves of the average fatigue limit of each spot weld in the MSW versus the number of spot welds.

Stress distribution at the faying surface in the MSW two and four spot welds.

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Mechanical Properties of Resistance Spot Welded Components of High Strength Austenitic Stainless Steel

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