Mechanical properties of Inconel 718 welds performed by gas tungsten arc welding

Cortés, R.; Barragán, E. R.; López, V. H.; Ambriz, R.R.; Jaramillo, David

doi:10.1007/s00170-017-1128-x

Cited by 46 publications

(14 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It showed 11.72 and 56.68% reduction in tensile strength and elongation compared to base metal. Cortes et al [20] reported 21.70 and 50% reduction in tensile strength and ductility of Inconel 718 GTAW joints relative to the base metal. Rodriguez et al [21] found that the tensile strength and elongation of GTA Inconel 718 welds were drastically reduced to 22.35 and 45.90% as compared to the base metal.…”

Section: Tensile Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Heat Input on Evolution of Microstructure and Tensile Properties of Gas Tungsten Constricted Arc (GTCA) Welded Inconel 718 Alloy Sheets

Sonar

Balasubramanian

Malarvizhi

et al. 2020

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

The significant effect of heat input on the microstructural characteristics and tensile properties of 2-mm-thick Inconel 718 alloy sheets joined by gas tungsten constricted arc welding process was investigated systematically. It involves the application of magnetic arc constriction technique to solve the heat input-related metallurgical problems in gas tungsten arc welding of Inconel 718 alloy such as segregation of Nb and laves phase evolution in weld metal region which drastically reduces the weld mechanical properties. Heat input range was used from 495 to 585 J/mm by varying Main Current from 60 to 80 A at distinct levels of 5 A. The average secondary dendrite arm spacing was increased from 6.31 to 8.92 μm, revealing the corresponding cooling rate between 2087 and 720 °C/s. Superior tensile properties were obtained at an optimum heat input of 518 J/mm. It exhibited 98.16 and 78% of base metal strength and ductility. It is attributed to the grain refinement in fusion zone microstructure and the evolution of lower amount of laves phase with finer and discrete morphology. The average size and volume fraction of laves phase for the current sample were 3.12 μm and 7.68%. The benefits of magnetic arc constriction and Delta Current pulsing were not achieved at higher heat input.

show abstract

Section: Tensile Propertiesmentioning

confidence: 99%

“…The published literature mainly pertains to gas tungsten arc welding (GTAW) [20][21][22], electron beam welding (EBW) [23][24][25] and laser beam welding (LBW) [26][27][28] of Inconel 718 alloy. The investigations on GTCA welding process are limited to titanium alloys [12][13][14][15] and steel [16,17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Input on Evolution of Microstructure and Tensile Properties of Gas Tungsten Constricted Arc (GTCA) Welded Inconel 718 Alloy Sheets

Sonar

Balasubramanian

Malarvizhi

et al. 2020

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

show abstract

“…GTCAW is the advanced variant of GTAW process which involves the use of magnetic arc constriction produced by Delta Current pulsing at a very high frequency up to 20 kHz. The research on welding of Inconel 718 alloy, so far, is mainly focussed on the gas tungsten arc welding (GTAW) [12][13][14], electron beam welding (EBW) [15,16] and laser beam welding (LBW) [17,18]. Researchers reported the use of current pulsing [19][20][21] and magnetic arc oscillation technique [22][23][24] to reduce the heat input and refine the fusion zone microstructure of Inconel 718 welds.…”

Section: Introductionmentioning

confidence: 99%

Effect of Delta Current and Delta Current Frequency on tensile properties and microstructure of Gas Tungsten Constricted Arc (GTCA) welded Inconel 718 sheets

Sonar

Balasubramanian

Malarvizhi

et al. 2019

Journal of the Mechanical Behavior of Materials

View full text Add to dashboard Cite

Inconel 718 is a nickel-based superalloy which finds major applications in lightweight welded frames and other parts in gas turbine engines. This alloy is frequently joined by gas tungsten arc welding (GTAW) process for clean and precise welds. However, the weldability of Inconel 718 alloy is limited by the high heat input and slower cooling rate in GTAW process. It leads to the segregation of alloying elements and detrimental laves phase formation in weld metal which significantly reduces the tensile properties of the welded joints. To overcome this problem, a newly developed gas tungsten constricted arc welding (GTCAW) process is used for joining Inconel 718 alloy. The main effect of Delta Current (DC) and Delta Current Frequency (DCF) on the tensile properties and microstructure of GTCA welded 2 mm thick Inconel 718 alloy sheets was investigated. Superior tensile properties were exhibited at Delta Current of 50 A and Delta Current Frequency of 4 kHz due to the refinement in fusion zone. Delta Current and Delta Current Frequency showed deleterious effect at higher levels due to the high heat input.

show abstract

“…Foram encontrados na literatura alguns trabalhos sobre a soldagem entre os aços Inconel e os inoxidáveis [4][5][6][7][8], no entanto não há estudos de resistência à corrosão através de ensaios de polarização cíclica combinando a junção especificamente do Inconel 718 com o aço 316L de forma autógena pelo processo TIG. Alguns estudos foram feitos com a mesma união e processo ou com união e processos similares, mas nenhum destes autores fizeram a utilização do levantamento dessas curvas para caracterizar a resistência à corrosão nesta junção.…”

Section: Introductionunclassified

“…Dokme et al [6] fizeram a caracterização da microestrutura e das propriedades mecânicas de amostras de inconel 625 soldadas ao aço 316L pelo processo TIG com corrente pulsada a e corrente contínua variando também os metais de adição. Cortés et al [7] realizaram ensaios mecânicos como testes de impacto e dureza em chapas de Inconel 718 soldadas pelo processo TIG com a utilização de metal de adição e submetidas a recozimento após a soldagem. Demarque et al [8] realizaram estudos em amostras com a mesma composição avaliando a microestrutura obtida e utilizando modelamento estatístico para estimar as características metalúrgicas da zona fundida produzida por um processo autógeno.…”

Section: Introductionunclassified

Resistência à Corrosão de Juntas Dissimilares dos Aços AISI 316L e da Liga Inconel 718

2019

View full text Add to dashboard Cite

Resumo A soldagem dissimilar (Dissimilar Metal Welds – DMWs), união de dois diferentes materiais metálicos, tem muitas aplicações industriais, com destaque para trocadores de calor nas usinas nucleares. Portanto, devem resistir à corrosão e a esforços mecânicos, entre outros requisitos. Neste trabalho foi abordada a susceptibilidade à corrosão da junta de união (feita por soldagem TIG – Tungsten Inert Gas), de forma autógena, de dois materiais distintos: Inconel 718 e o aço AISI 316L. Foram realizadas soldagens sob diferentes condições de aportes térmicos e correspondentes quantificações de fases utilizando microscopias e ferritoscopia e correlacionadas com o comportamento eletroquímico desta união em meios contendo cloretos. As análises microscópicas e ferromagnéticas mostraram que não houve formação da fase sigma durante a soldagem e a existência de altos teores de ferrita na região da zona fundida próxima a ZAC (zona afetada pelo calor) do aço 316L. Os ensaios eletroquímicos de corrosão mostram que as amostras nas diferentes regiões apresentaram a seguinte ordem decrescente de resistência à corrosão localizada: Amostra com maior aporte térmico (0,50 J/mm), na interface ZF/Inconel > Amostra com menor aporte térmico (0,33 J/mm) na interface ZF/Inconel > Amostra com menor aporte térmico, na interface ZF/316L > Amostra com maior aporte térmico, na interface ZF/316L> aço 316L. Finalmente, os diferentes aportes térmicos não provocaram diminuição da resistência à corrosão comparados ao aço 316L nas diferentes regiões de solda.

show abstract

Mechanical properties of Inconel 718 welds performed by gas tungsten arc welding

Cited by 46 publications

References 10 publications

Effect of Heat Input on Evolution of Microstructure and Tensile Properties of Gas Tungsten Constricted Arc (GTCA) Welded Inconel 718 Alloy Sheets

Effect of Heat Input on Evolution of Microstructure and Tensile Properties of Gas Tungsten Constricted Arc (GTCA) Welded Inconel 718 Alloy Sheets

Effect of Delta Current and Delta Current Frequency on tensile properties and microstructure of Gas Tungsten Constricted Arc (GTCA) welded Inconel 718 sheets

Resistência à Corrosão de Juntas Dissimilares dos Aços AISI 316L e da Liga Inconel 718

Contact Info

Product

Resources

About