Creep rupture strength of activated-TIG welded 316L(N) stainless steel

Sakthivel, T.; Vasudevan, M.; Laha, K.; Chandravathi, K.S.; Mathew, M.D.; Bhaduri, A.K.

doi:10.1016/j.jnucmat.2011.03.047

Cited by 20 publications

(5 citation statements)

References 12 publications

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“…Besides the stainless steel material, TIG welding had been deployed to the fusion of AA7075 aluminum alloy joint, as indicated in Sivashanmugam et al (2009). Still, on the use of stainless steel in TIG welding, the focus of attention by Sakthivel et al (2011) is to optimize the creep rupture strength of the welded material. It was concluded that by raising the fusion current and concurrence raise in the perforation, an excessive increase in the width of the weld and a small commensurable increase in perforation are obtained.…”

Section: Tungsten Inert Gas Welding and Stainless-steel Usagementioning

confidence: 99%

Optimization of Process Parameter of Tungsten Inert Gas Welding for Austenitic Stainless Steel using Grey Wolf Optimization

Adekola

Oke

Nwankiti

2022

IJIEEM

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Optimization of welding parameters is essential on austenitic stainless steel for industrial applications since they declare the best parameters compared with prioritized constraints. However, available optimization methods, such as the Taguchi method, widely used in this research domain, are weak. Their results are merely comparative and fail to particularly show the specific factor that displays the highest performance in the process. In this paper, the aim is specifically to position the parameters in order of importance and present them in a grey wolf optimization framework. The ultimate tensile strength and yield strength were optimized, and the optimization was conducted using the C++ programming code. Literature data were analyzed for austenitic stainless steel under un-notched/smooth and notched specimen conditions. Empirical models were developed for the ultimate tensile strength and yield strength, among other principal criteria of the material. For the ultimate tensile strength, the best value was obtained at the 100th iteration as 640.75. For the yield strength, the best value of 394.98 was obtained after 100 iterations. A value of 31.07 for the PE was obtained. These results are for the unnotched specimens. However, the PE, NTS, and yield strength values for the notched specimens are 16.32, 780.12, and 494.46, respectively. Based on the findings of this study and compared with other optimization methods, the optimal parameters and outputs predicted using the grey wolf optimization approach were found to produce reliable results. This shows that the grey wolf optimization approach is a good option for predicting the optimal parameters of the tungsten arc welding process by utilizing austenitic stainless steel. The usefulness of this research effort is to help process engineers to implement robust and effective cost decisions in the production of materials based on austenitic stainless steel.

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Section: Tungsten Inert Gas Welding and Stainless-steel Usagementioning

confidence: 99%

Optimization of Process Parameter of Tungsten Inert Gas Welding for Austenitic Stainless Steel using Grey Wolf Optimization

Adekola

Oke

Nwankiti

2022

IJIEEM

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“…The overall Weld Strength Reduction Factor (WSRF) of AGTAW was shown as more compared to MP-TIG process. 9,10 AGTAW welding process exhibits a considerably lower peak tensile and residual stress values over the TIG process while joining high thickness (16 mm) 316LN plate. 11 AGTAW welding process is capable of welding up to 10 mm stainless steel plate in a single pass.…”

Section: Introductionmentioning

confidence: 99%

Role of welding processes on microstructure and mechanical properties of nuclear grade stainless steel joints

Rajasekaran¹,

Lakshminarayanan²,

Vasudevan

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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Nuclear grade 316LN austenitic stainless steel weld joints were fabricated using conventional gas tungsten arc welding (GTAW), activated flux gas tungsten arc welding (AGTAW), laser beam welding (LBW) and friction stir welding (FSW) processes. Assessment of weld beads was done by mechanical and metallurgical characterizations. Bead geometry and weld zones were studied by taking macrographs along the transverse side of the weld joints. Metallurgical features of different weld joints were carried out using optical microscopy and scanning electron microscopy. Microhardness distribution across four weld joints was recorded and hardness variations were compared. All weld zone, heat affected zone (HAZ) of GTAW and LBW, thermo-mechanically affected zone (TMAZ) of FSW processes, exhibited higher hardness values than the base metal. Reduced hardness was recorded at HAZ of AGTAW process. This was the result of a considerable grain growth. LBW joint showed the highest hardness value at the center of the fusion zone due to fine equiaxed dendrite morphology. Tensile and impact properties of different welding processes were evaluated and comparisons were made at room temperature. All weld samples displayed high yield strength (YS) and ultimate tensile strength (UTS) with a lower percentage of elongation compared to that of the base metal. FSW joint showed improved YS, UTS and impact toughness compared to other weld joints. This is attributed to the formation of strain-free fine equiaxed grains at stir zone around 5 µm in size with subgrains of 2 µm in size by severe dynamic recrystallization mechanism. Among the fusion welding techniques, AGTAW process exhibited improved toughness, besides almost equal toughness of the base metal due to low δ-Ferrite with high austenite content. Fractography studies of the base metal and different weld samples were carried out by SEM analysis and features were compared.

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“…Whereas there is increase in HAZ and weld penetration with A-TIG as compared to TIG welding process. Sakthivel et al [16] studied the creep behaviour that 316L(N) SS plates joined by TIG and A-TIG welding process using oxide fluxes as activated flux. The result indicated that there was an increment in creep rupture strength of weld produced by A-TIG over TIG welding process.…”

Section: Introductionmentioning

confidence: 99%

Performance of weld bead profile during A-TIG welding on nitrogen alloyed stainless steel

et al. 2021

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Austenitic stainless steel (ASS) is widely fabricated by tungsten inert gas (TIG) welding for aesthetic look and superior mechanical properties while compared to other arc welding process. Hitherto, the limitation of this process is low depth of penetration and less productivity. To overcome this problem activated tungsten inert gas (A-TIG) welding process is employed as an alternative. In this investigation the welding performance of conventional TIG welding is compared with A-TIG process using TiO2 and SiO2 flux with respect to weld bead geometry. The experimental investigation on A-TIG welding of ASS-201 grade shows TiO2 flux helps in achieve higher penetration as compared to SiO2 flux. While welding with SiO2 the hardness in HAZ and weld region higher than that of TIG welding process.

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Creep rupture strength of activated-TIG welded 316L(N) stainless steel

Cited by 20 publications

References 12 publications

Optimization of Process Parameter of Tungsten Inert Gas Welding for Austenitic Stainless Steel using Grey Wolf Optimization

Optimization of Process Parameter of Tungsten Inert Gas Welding for Austenitic Stainless Steel using Grey Wolf Optimization

Role of welding processes on microstructure and mechanical properties of nuclear grade stainless steel joints

Performance of weld bead profile during A-TIG welding on nitrogen alloyed stainless steel

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