Studies on the structural property, mechanical relationships and corrosion behaviour of Inconel 718 and SS 316L dissimilar joints by TIG welding without using activated flux

Ramkumar, T.; Selvakumar, M.; Narayanasamy, P.; Begam, A. Ayisha; Mathavan, P.; Raj, Anand

doi:10.1016/j.jmapro.2017.09.028

Cited by 79 publications

(23 citation statements)

References 24 publications

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“…Kumar et al [25] also found similar microstructural results in their study. Nevertheless, Nb, Ti, Ni and Cr precipitates were located, which also reduces the corrosion resistance [10]. The TIG 316L filler material does not contain Nb in the chemical composition, although an Nb-rich formation was confirmed.…”

Section: Discussionmentioning

confidence: 94%

“…The bimetallic joints of Inconel 625 and austenitic stainless steel AISI 316 L are used in the chemical process at very high temperatures, especially the chromic acid calcining process, which contains a diluted acidic environment. Therefore, many researchers have studied it during last decade [7][8][9][10][11]. One of the main reasons is that it reduces cost of materials, and the other is that it improves design as a result of operating environment requirements [12].…”

Section: Introductionmentioning

confidence: 99%

“…Ramkumar et al [10] studied the corrosion behavior of the similar and dissimilar TIG welding of Inconel 718 and SS 316L. Both similar weldments of Inconel 718 and SS 316L possessed a lower hardness value than that of dissimilar weldments.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Dökme

Külekçi

Eşme

2018

Metals

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This study investigated the microstructure of the dissimilar metal welding of Inconel 625 and AISI 316L using Continuous Current Gas Tungsten Arc Welding (CCGTAW) and Pulsed Current Gas Tungsten Arc Welding (PCGTAW) processes with ERNiCr-3, TIG 316L and twisted (ERNiCr-3 and TIG 316L) fillers. Microstructure examinations were carried out using an optical microscope and Scanning Electron Microscopy (SEM)/Energy Dispersive X-Ray (EDAX). The results of the study showed the existence of a partially melted zone (PMZ) on the AISI 316L side. Weld zone (WZ) analysis showed the existence of a multi-directional grain growth on the 316L side in all specimens, although less growth was found on the Inconel 625 side. Grain growth almost disappeared using PCGTAW with twisted fillers. SEM/EDAX investigations indicated that secondary deleterious secondary phases were tiny and white in five experiments. However, a meager amount of precipitates occurred in PCGTA welding with twisted fillers. Moreover, these were particularly innocent precipitates, represented by black dots in images, whereas other tiny white secondary phases are known to be brittle. As a result, PCGTA welding with twisted fillers exhibited the best metallurgical properties.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Dökme

Külekçi

Eşme

2018

Metals

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“…Shakil et al [3] avaliaram as microestruturas e microdurezas de uma junta dissimilar de Inconel 625 e aço inoxidável 304L soldados por feixe de elétrons. Ramkumar et al [4] estudaram sobre a propriedade estrutural, relações mecânicas e comportamento corrosivo de juntas soldadas dissimilares de Inconel 718 e Inox 316L pelo processo de soldagem TIG sem usar fluxo ativado. Mortezaie e Shamanian [5] realizaram um estudo da microestrutura, propriedades mecânicas e resistência a corrosão de juntas dissimilares entre Inconel 718 e aço inox austenítico 310S utilizando o processo GTAW com três tipos de materiais de adição Inconel 625, Inconel 82 e Inox austenítico 310, respectivamente.…”

Section: Avaliação De Parâmetros De Soldagem Nas Características De Junclassified

Avaliação de Parâmetros de Soldagem nas Características de Juntas Dissimilares Inconel 718 - Inox 316L Soldadas pelo Processo TIG Autógeno

et al. 2018

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado.Resumo: A aplicação de juntas soldadas dissimilares, de Inconel 718 endurecível por precipitação e aço inoxidável austenítico AISI316L, ocorre principalmente em indústrias aeroespaciais e plantas de usinas nucleares. Isso ocorre devido à elevada resistência mecânica aliada a boa resistência à corrosão em ambos ambientes e condições de temperaturas. Este trabalho objetivou avaliar o efeito da intensidade da corrente de soldagem e da temperatura de interpasse em juntas dissimilares utilizando o processo de soldagem a arco com eletrodo de tungstênio e proteção gasosa (TIG) autógeno. Este processo de soldagem foi escolhido em função de seus excelentes resultados aliados à facilidade operacional e baixo custo. Foi utilizada a ferramenta de planejamento experimental para maximizar o potencial dos resultados experimentais. Para caracterização metalúrgica foram utilizados análise da macrografia da junta soldada, de perfis de microdureza, e de microscopia ótica (MO). A variação da corrente de soldagem e da temperatura de interpasse ocasionou alteração da geometria da zona fundida (ZF) de até 232% de aumento da área da ZF. A microdureza sofreu uma variação de até 25% de aumento na região da ZF. Quanto a fração volumétrica de ferrita, foi observado um acréscimo de até 139% na região da ZF. Este trabalho objetiva também estabelecer referências de parâmetros de soldagem que possam proporcionar garantias de estabilidade para a união metalúrgica entre metais de dissimilares. Palavras-chave:Aços inoxidáveis austeníticos; Super liga de níquel; Soldabilidade; Junta soldada; Processo TIG. Abstract:The application of dissimilar welded joints, from Inconel 718 precipitation curable and AISI316L austenitic stainless steel, occurs mainly in the aerospace and nuclear power plant industries. This is due to the high mechanical resistance coupled with good corrosion resistance in both environments and temperature conditions. The aim of this study was to evaluate the effect of welding current and interbody temperature on dissimilar joints using the tungsten electrode and gaseous protection (GTAW) autogenous arc welding process. This welding process was chosen due to its excellent results coupled with ease of operation and low cost. The experimental planning tool was used to maximize the potential of the experimental results. For metallurgical characterization, the weld joint macro-analysis, microhardness profile, and optical microscopy (OM) analysis were used. The variation of the welding current and the interpolation temperature caused a change in the geometry of the molten zone (MZ) of up to 232% increase in the ZF area. The microhardness varied up to a 25% increase in the MZ region. As for the volumetric fraction of ferrite, an increase of up to 139% in the MZ region w...

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“…The intermetallic compound formed at the welded/fusion area between Cu and Al, which were identified as, Al4Cu9, Al2Cu3, and Al2Cu. As we are using Cu and aluminium alloys, these intermetallic compounds cannot be taken as such because of the major alloying element of Al 5083 is Mg and also phases can be formed between that of Ni [3,4]. Due to the requirement of heat for joining the two alloys, the ampere range in the welding machine is set to 180 A which can give approximately an temperature of 1400 ℃ where it can result in the burning of aluminium alloy during the welding process [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Weld Joint: Cupro – Nickel with Aluminium 5083

Dominic*¹,

Krishnakumar²,

Saravanan³

2019

IJRTE

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Cupro-Nickel and Aluminium alloy to their series, Al 5083 and 70Cu30Ni are the critical alloys in ship building mainly in piping section. Due to the reason of having a huge difference in their physical and chemical properties, obtaining a good bonding between them by welding is rather a tough job. The welding was conducted by giving waviness to the torch and allowing the molten pool of Cu-Ni to flow towards the Al 5083 and thereby joining them without melting the aluminium. The microstructure was studied by welding plain plates as well as Nickel coated plates. The microstructural study showed that there is a good bonding between the two alloys. The SEM imaging confirms the bonding of the two alloys at the welded region. The elemental composition of the weld joint was found by EDS analysis. The formation of intermetallics was confirmed by XRD analysis. Then the hardness at the weld joint was studied. The hardness value obtained from testing was promising and there with showing a good properties at the welded joint. The Ni coated welded alloys showed significant and improved results when comparing with the non-nickel plated metal plates. With the hardness value varying from the non Ni coated plates was found to be high compared to the hardness value of the Al and Cu-Ni alloy. But the further study showed that that hardness value adds much to the weld stability by the formation of good bonds between the alloys and that of the intermetallics formed. The impact tests conducted on the welded specimen shows good results with regards to the comparison with the impact strength of 70Cu30Ni and the energy absorbed by the welded specimen. The results showed that welding is possible between these alloys and the nickel coated alloys shows better results in strength and bonding than non- nickel coated alloys. This study also confirms that GTAW can be very effective in joining these dissimilar alloys.

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Studies on the structural property, mechanical relationships and corrosion behaviour of Inconel 718 and SS 316L dissimilar joints by TIG welding without using activated flux

Cited by 79 publications

References 24 publications

Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Avaliação de Parâmetros de Soldagem nas Características de Juntas Dissimilares Inconel 718 - Inox 316L Soldadas pelo Processo TIG Autógeno

Evaluation of Weld Joint: Cupro – Nickel with Aluminium 5083

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