Microstructure evolution and mechanical properties of keyhole deep penetration TIG welds of S32101 duplex stainless steel

Cui, Shuwan; Shi, Yonghua; Sun, Kun; Gu, Shuqing

doi:10.1016/j.msea.2017.10.051

Cited by 62 publications

(23 citation statements)

References 19 publications

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“…The misorientation angle distribution progressively migrated from HAGBs to LAGBs. In combination with the above examination, it can be stated that for WM compared with BM the tensile strength increases and toughness decreases [59].…”

Section: Microstructural Examinationmentioning

confidence: 69%

Investigations on mechanical properties and microstructural examination of activated TIG-welded nuclear grade stainless steel

Kumar

Sankarapandian²,

Shanmugam

2020

J Braz. Soc. Mech. Sci. Eng.

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Nuclear grade austenitic stainless steel 321 contains titanium for severe corrosive conditions and is used for process equipment, aircraft exhaust manifolds and boiler shells. Taguchi-based grey relational analysis technique has been considered to optimize the input parameters for welding SS321 material using activated tungsten inert gas welding process. The optimized input parameters were identified from the multiple output responses, i.e. arc length of 3 mm, welding current of 220 Amps and welding speed of 120 mm/min (A 1 B 3 C 1). The analysis of the variance table was performed to calculate the importance of the input parameters in the weldment quality. Also, the influence of the heat input on the depth of penetration and bead width at different arc lengths has been studied. The mechanical integrity is evaluated in terms of tensile strength for base metal (BM) (621 MPa) and weld metal (WM) (624 MPa) specimens by conducting the uniaxial tensile test. The 180° bend test with WM sample revealed the ductility level and was free from fissures and cracks. Charpy impact test results depicted the toughness values of BM (123.17 J) and WM (113.46 J) samples. Microstructural investigations at the SS321 WM highlighted the existence of columnar and equiaxed dendrites in the fusion zone. Moreover, the formation of titanium carbide reduces the chances of weld decay. Ferrite number measurement shows that the amount of delta ferrite is higher in WM (5.9) than in BM (1.2). The existence of dimples and voids in the fractographic analysis of the failed specimens (tensile and impact) confirms the ductile type of failure.

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Section: Microstructural Examinationmentioning

confidence: 69%

Investigations on mechanical properties and microstructural examination of activated TIG-welded nuclear grade stainless steel

Kumar

Sankarapandian²,

Shanmugam

2020

J Braz. Soc. Mech. Sci. Eng.

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“…The DSS plates were mechanically cleaned by a polisher, and the groove was not prepared before ULK-TIG welding. The welding parameters were selected according to previous studies and are listed in Table 2 [8]. A detailed description of the ULK-TIG welding equipment is shown in Figure 1.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…Cui et al [8,9] have successfully welded 10.8 mm DSS plates and have proven that the mechanical and intergranular corrosion properties of K-TIG welded joints are excellent. At present, K-TIG welding has attracted the attention of the research community [10,11]; however, no researchers have applied K-TIG welding to underwater welding.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Impact Toughness of Local-Dry Keyhole Tungsten Inert Gas Welded Joints

et al. 2019

Self Cite

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In this paper, the microstructure and impact toughness of a S32101 duplex stainless steel underwater local-dry keyhole tungsten inert gas welded joint were studied. The impact toughness value of the underwater weld metal reached 78% of the onshore weld metal, which is in accordance with the underwater welding standards. The proportion of austenite in the underwater weld metal was 0.9% lower than that of the onshore weld metal. The proportion of the Σ3 coincidence site lattice boundaries and random phase boundaries in the underwater weld metal, which significantly influence the impact toughness of the weld metal, were smaller than that of the onshore weld metal.

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“…To date, K-TIG has found applications in industries for joining medium thickness materials, say titanium [6], zirconium [7], stainless steel [8], low carbon steel [9] and dissimilar metal welding [10]. It was shown in these studies that K-TIG can complete the medium thickness weld in a single pass with a V-shaped morphology.…”

Section: Of 15mentioning

confidence: 99%

“…More importantly, unlike conventional TIG welding for which the weld formation can be partially controlled or compensated by the operators, the K-TIG operates in a completely automated mode, with the weld formation being entirely dependent on the welding parameter combination. Although in some studies, small amount of welding trials were conducted to test the influence of welding parameters in the K-TIG welding, the main purpose was to find a parameter combination to achieve full penetration, as did by Cui et al [8] and Feng et al [20]. The mechanism for defect formation and the correlation between weld formation and mechanical properties in the K-TIG welding process have not been addressed.…”

Section: Of 15mentioning

confidence: 99%

Effect of Heat Input on Weld Formation and Tensile Properties in Keyhole Mode TIG Welding Process

Fei

Pan

Cuiuri

et al. 2019

Metals

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Keyhole mode Tungsten Inert Gas (K-TIG) welding is a novel advanced deep penetration welding technology which provides an alternative to high power density welding in terms of achieving keyhole mode welding. In order to facilitate welding procedure optimisation in this newly developed welding technology, the relationship among welding parameters, weld formation and tensile properties during the K-TIG welding was investigated in detail. Results show that except for travel speed, the heat input level also plays an important role in forming undercut defect by changing the plasma jet trajectory inside keyhole channel, leading to the formation of hump in the weld centre and exacerbation of undercut formation. Both undercut defect and root side fusion boundary can act as a stress concentration point, which affects the fracture mode and tensile properties considerably. The research results provide a practical guidance of process parameter optimisation and quality assurance for the K-TIG welding process.

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Microstructure evolution and mechanical properties of keyhole deep penetration TIG welds of S32101 duplex stainless steel

Cited by 62 publications

References 19 publications

Investigations on mechanical properties and microstructural examination of activated TIG-welded nuclear grade stainless steel

Investigations on mechanical properties and microstructural examination of activated TIG-welded nuclear grade stainless steel

Microstructure and Impact Toughness of Local-Dry Keyhole Tungsten Inert Gas Welded Joints

Effect of Heat Input on Weld Formation and Tensile Properties in Keyhole Mode TIG Welding Process

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