Microstructure and Mechanical Properties of Active Gas Arc Welding between 304 Austenitic Stainless Steel and Q235B Low Carbon Steel

Liu, Jihua; Li, Xinghao; Zhou, Yiqiang; Yu, Pijie; He, Chenggang; Xu, Zhiai

doi:10.1007/s11665-022-06808-2

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Meanwhile, the boundary between the BM and HAZ can be found. The boundary, which is called the fusion line between the HAZ and the FZ, is mainly attributed to the different heat input and rapid cooling rate during the welding process leading to the formation of different zones 9,27 . The HAZ size along the thickness of the plates is found to be similar, however, the FZ size varies from 2 to 6 mm along the plate thickness in Figure 4A.…”

Section: Resultsmentioning

confidence: 98%

Microstructure evolution and mechanical properties of two kinds of weathering steel welded joints

Cong

Liu

Huang

et al. 2022

Fatigue Fract Eng Mat Struct

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The microstructural evolution and mechanical properties of welded joints for Q450NQR1 and Q450AWR5 alloys were investigated. The inhomogeneous microstructures of Q450NQR1 and Q450AWR5 welded joints can result in heterogeneous mechanical responses. Microhardness distributions of the two welded joints are not uniform with the highest hardness value in the FZ, followed by the HAZ, and the lowest hardness value in the BM. The tensile strength of Q450AWR5 welded joints is slightly higher than the Q450NQR1 welded joints. The tensile fracture occurred in the BM of both welded joints, probably due to the strengthening effect of bainite with high dislocation density and lattice distortion. The fatigue life is dominated by the welded defects inside the welded joint. The location of fatigue failure occurs mainly near the fusion zone and is limited by the welded defects, independent of the microstructure.

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Section: Resultsmentioning

confidence: 98%

Microstructure evolution and mechanical properties of two kinds of weathering steel welded joints

Cong

Liu

Huang

et al. 2022

Fatigue Fract Eng Mat Struct

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“…The solidification mode ferritic -austenitic (FA) can be identified when the ratio of Cr eq /Ni eq is less than 3.75 due to the diffusivity of Mo and Cr in the ferrite phase. Liu et al [30] reported that the ferritic elements such as Mo and Cr were retained during FA mode and could limit the growth of austenite. From the present study, the Cr eq /Ni eq ratios for the weld zone ranged from 1.6 to 3.6 for all heat inputs.…”

Section: Fusion Zone (Fz) Microstructurementioning

confidence: 99%

Examination on joining of 2 mm thick dissimilar stainless steel plates using resistance spot welding

Vignesh

2023

Eng. Res. Express

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In the present study, dissimilar metals such as austenitic stainless steel (ASS) and duplex stainless steel (DSS) with a thickness of 2 mm are joined by resistance spot welding process to investigate the welding metallurgy and failure behavior under different heat inputs. Non-uniform electrode impressions are observed on ASS and DSS sides due to their different thermal conductivity and electrical resistivity. The microstructure of the Fusion Zone (FZ) shows that higher heat input accelerates the growth of Intra Granular Austenite (IGA) due to faster cooling. Scanning electron microscopy (SEM) - Energy Dispersive X-ray (EDX) investigation at FZ showed that Chromium & Molybdenum decrease with increasing heat input due to a decrease in ferrite content. X-ray diffraction analysis confirmed that ferrite formation is limited at higher heat input. Microhardness study revealed that the higher hardness is in the middle of the weld nugget, which is due to the presence of equiaxed grains and IGA. The lowest hardness on the ASS side of Heat Affected Zone (HAZ) is due to the phenomenon of grain growth, and the HAZ DSS side has a higher hardness than DSS Base Metal (BM) due to the mechanism of solid solution strengthening. The tensile shear test showed that the tensile shear strength increases with the addition of heat. SEM Examination of the fracture surface revealed the presence of an equiaxed dimple structure on the ASS side, confirming ductile fracture, and torn bonds on the DSS side, confirming quasi-gap fracture due to the work-hardening ability of both plates. This study is carried out to understand the relationship between mechanical, metallurgical, and failure behaviours, because, researches on joining of dissimilar (AISI 316L and DSS 2205) stainless steel sheets using Resistance Spot Welding process is very limited and need to be studied in detail.

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Improving weld penetration by two-TIG arc activated via mixing oxygen into shielding gas

Zhang

Shao

Wang

et al. 2022

Int J Adv Manuf Technol

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Microstructure and Mechanical Properties of Active Gas Arc Welding between 304 Austenitic Stainless Steel and Q235B Low Carbon Steel

Cited by 5 publications

References 24 publications

Microstructure evolution and mechanical properties of two kinds of weathering steel welded joints

Microstructure evolution and mechanical properties of two kinds of weathering steel welded joints

Examination on joining of 2 mm thick dissimilar stainless steel plates using resistance spot welding

Improving weld penetration by two-TIG arc activated via mixing oxygen into shielding gas

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