Thermal stress analysis of AISI 316 stainless steels weldments in TIG and pulse TIG welding processes

Yelamasetti, Balram; Vardhan, T. Vishu; Babu, B. Sridhar; Ramana, G. Venkat; Preethi, Ch.

doi:10.1016/j.matpr.2019.06.695

Cited by 15 publications

(3 citation statements)

References 10 publications

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“…Although its simplicity of execution, usually involving the deposition of molten filler metal and the localized heat input, the weld region close to the welded joint experiences complex thermo-mechanical cycles due to localized heating and cooling steps. Generally, these result in nonuniform expansion (heating phase) and shrinking (cooling phase) sequence of the region between the base metal and the welded material leading to distortion [1][2][3][4] particularly detrimental for the functional performance and service safety of the component. For this reason, an accurate knowledge of the thermomechanical aspects featuring the joining procedure and its evolution during the process execution is required with the aim to identify, control and minimize problems to achieve the desired and reliable outputs.…”

Section: Introductionmentioning

confidence: 99%

Finite element modelling and experimental validation of microstructural changes and hardness variation during gas metal arc welding of AISI 441 ferritic stainless steel

Caruso

Imbrogno

2022

Int J Adv Manuf Technol

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Grain growth and hardness variation occurring in high temperature Heat Affected Zone (HAZ) during the welding processes are two thermal dependant aspects of great interest for both academic and industrial research activities. This paper presents an innovative Finite Element (FE) model capable to describe the grain growth and the hardness decrease that occur during the Gas Metal Arc Welding (GMAW) of commercial AISI 441 steel. The commercial FE software SFTC DEFORM-3D TM was used to simulate the GMAW process and a user subroutine was developed including a physical based model and the Hall-Petch (H-P) equation to predict grain size variation and hardness change. The model was validated by comparison with the experimental results showing its reliability in predicting important welding characteristics temperature dependant. The study provides an accurate numerical model (i.e. user subroutine, heat source fitting, geometry,…) able to successfully predict the thermal phenomena (i.e. coarsening of the grains and hardening decrease) that occur in the HAZ during welding process of ferritic stainless steel.

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Section: Introductionmentioning

confidence: 99%

Finite element modelling and experimental validation of microstructural changes and hardness variation during gas metal arc welding of AISI 441 ferritic stainless steel

Caruso

Imbrogno

2022

Int J Adv Manuf Technol

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“…Infra-Red Thermography (IRT) is a technique that detects the IR energy emitted from the surface and converts that energy to temperature, and shows a photograph of the temperature distribution. One of the first indications of faults in mechanical, electrical processes and R&D systems is an increase in temperature due to increased resistance or friction or many more reasons based on the different applications [22]. These increased temperatures can be detected and qualified using the latest thermal imaging cameras.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermal Fields, Weld Strength and Microstructural Studies of Friction Stir Dissimilar Weldments of AA6082 and AA7075

Ramakrishna

Srinivas²

2022

KEM

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This research work aims to investigate thermal fields, weld strength and microstructural analyses of dissimilar welded structures of AA6082 and AA7075 developed using friction stir welding process. Three different tool shapes were used for joining of these plates to study the effect tool profiles on thermal cycles and their behavior on weld strength. The process parameters were considered same for three tool weldments. During welding, peak temperatures and their distribution towards along transverse direction and cooling temperature were recorded using Infra-Red (IR) thermography. The samples were inspected were X-ray radiography test to examine the defects. The tensile strength of the welded structures was evaluated by conducted tension test according to ASTM E/8 standards. Further, the microstructural behavior for three tool profile pins was studied using optical microscopy. The tool profile with cylindrical shape exhibiting higher tensile strength than the other two samples due to lower temperatures and uniformity of heat distribution during welding process. Also, the microstructural studies revealed that the fine grains with proper mixing zones were observed when cylindrical tool was employed. From this research work, IR thermography is most suitable for measuring In-situ temperature profiles even at weld vicinity during welding.

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“…Costanza et al [2] estudaram a soldabilidade de aços inoxidáveis austeníticos através de soldagem TIG e MIG utilizando diferentes gases de proteção, chegando a conclusão que o aço AISI 316 possui boa soldabilidade mesmo soldado com diferentes composições de gás de proteção. Balram et al [3] analisaram a distribuição de temperatura e tensões residuais nas soldagens TIG e TIG pulsada do aço AISI 316, sendo observadas maiores tensões residuais na soldagem TIG devido ao fornecimento contínuo de calor ao metal base. Samanta et al [4] estudaram a influência da adição de terras raras no cordão de solda do aço AISI 316L soldado por processo TIG, sendo afirmado que a adição de terras raras promove melhor resistência à oxidação do cordão.…”

Section: Introductionunclassified

Influência do Aporte Térmico sobre as Características e Propriedades de Cordões de Solda dos Aços AISI 316 e AISI 316L

et al. 2020

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Resumo: Aços AISI 316 e AISI 316L possuem ampla aplicação industrial, por isso a importância de avaliar a soldabilidade dessas ligas. Neste estudo, foi feita análise comparativa entre as amostras de ambos os aços soldados com aportes de 0,5, 1,5 e 2,5 kJ/mm utilizando processo TIG autógeno. Foi analisada a variação do aporte térmico sobre a morfologia do cordão de solda, o espaçamento entre ferritas δ, a fração volumétrica de ferrita δ e a microdureza na zona fundida. Os resultados mostraram que as dimensões do metal de solda, o espaçamento entre as ferritas e a fração volumétrica de ferrita δ tornam-se maiores com o aumento do aporte. As amostras soldadas do aço AISI 316L apresentaram maior espaçamento entre ferritas δ e maiores frações de ferrita δ que o aço AISI 316. Quanto à microdureza, o estudo mostrou que quanto mais próximo do centro da zona fundida, maior é o valor de microdureza, sendo a microdureza do aço AISI 316 maior que a do aço AISI 316L. Através de modelagem computacional foi possível avaliar a distribuição de temperatura ao longo das chapas soldadas e comparar o ciclo térmico obtido por simulação com o ciclo calculado experimentalmente para o aporte de 0,5 kJ/mm.

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Thermal stress analysis of AISI 316 stainless steels weldments in TIG and pulse TIG welding processes

Cited by 15 publications

References 10 publications

Finite element modelling and experimental validation of microstructural changes and hardness variation during gas metal arc welding of AISI 441 ferritic stainless steel

Finite element modelling and experimental validation of microstructural changes and hardness variation during gas metal arc welding of AISI 441 ferritic stainless steel

Analysis of Thermal Fields, Weld Strength and Microstructural Studies of Friction Stir Dissimilar Weldments of AA6082 and AA7075

Influência do Aporte Térmico sobre as Características e Propriedades de Cordões de Solda dos Aços AISI 316 e AISI 316L

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