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Article

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

1
Sisecam Chemicals Group Soda Sanayii A.S. Kromsan Chromium Chemicals Plant, 33003 Mersin, Turkey
2
Tarsus University Faculty of Technology, 33400 Mersin, Turkey
*
Author to whom correspondence should be addressed.
Metals 2018, 8(10), 797; https://doi.org/10.3390/met8100797
Received: 4 September 2018 / Revised: 30 September 2018 / Accepted: 2 October 2018 / Published: 4 October 2018
(This article belongs to the Special Issue Dissimilar Metal Welding)
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. View Full-Text
Keywords: dissimilar metal welding; Inconel 625; AISI 316L; microstructure; filler metals dissimilar metal welding; Inconel 625; AISI 316L; microstructure; filler metals
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MDPI and ACS Style

Dokme, F.; Kulekci, M.K.; Esme, U. Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L. Metals 2018, 8, 797. https://doi.org/10.3390/met8100797

AMA Style

Dokme F, Kulekci MK, Esme U. Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L. Metals. 2018; 8(10):797. https://doi.org/10.3390/met8100797

Chicago/Turabian Style

Dokme, Fatih; Kulekci, Mustafa K.; Esme, Ugur. 2018. "Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L" Metals 8, no. 10: 797. https://doi.org/10.3390/met8100797

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