Characterization of Fillet Welded Armor Steel Performed by Robotic Gas Metal Arc Welding: Effect of Heat Input on Microstructure and Microhardness

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dc.authoridGürol, Uğur/0000-0002-3205-7226
dc.authorwosidÇoban, Ozan/JED-3718-2023
dc.authorwosidGürol, Uğur/AAN-1097-2021
dc.contributor.authorCoban, Ozan
dc.contributor.authorKaymak, Fatih
dc.contributor.authorGurol, Ugur
dc.contributor.authorKocak, Mustafa
dc.date.accessioned2024-06-13T20:17:51Z
dc.date.available2024-06-13T20:17:51Z
dc.date.issued2023
dc.departmentİstanbul Gedik Üniversitesien_US
dc.description.abstractIn this research, fillet welding was conducted on 8-mm thick Miilux OY Protection 600 (MIL-A-46100) armor steel using AWS A5.9 GeKa ER307 austenitic filler wire. The welding process involved robotic MIG/MAG with five different heat inputs ranging from 0.3 to 1.2 kJ/mm. The study focused on examining the influence of heat input on the microstructure, elemental changes, microhardness, and dimensions of the weld metal and the heat-affected zone (HAZ). These investigations were conducted to determine the welding parameters that they satisfy the quality requirements of the MIL-STD-1185 standard for this steel grade and weld consumable. Through analysis of macrostructure, microstructure, and microhardness, it was observed that increasing the heat input led to a decrease in hardness for both the weld metal and the HAZ, while expanding the HAZ width. The weld metal exhibited a homogenous hardness distribution at lower and higher heat inputs, but hardness increased from the root to the face for both heat inputs of 0.5 and 0.7 kJ/mm welds. Notably, a significant decrease in hardness occurred in the transition of partial transformation region (intercritical HAZ) and tempering region (subcritical HAZ) for heat inputs above 0.7 kJ/mm, indicating softening. Moreover, the width of the subcritical heat-affected zone substantially increased. Evaluation of the distance required to reach base metal hardness from the welding toe revealed that a heat input of 1.2 kJ/mm exceeded the maximum requirement of 15.9 mm according to the MIL-STD-1185 standard. However, the requirements of the military standard were satisfied for other heat input values. These findings were associated with microstructural changes in grain size, martensite, bainite, martensite/austenite morphology and their fractions, as well as delta ferrite morphology. The results successfully demonstrated that robotic GMAW welding can be applied using lower strength (undermatched) filler metal to satisfy the requirements of the respective standard of MIL-STD-1185.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [TUBITAK-1505, 5210029]en_US
dc.description.sponsorshipThe study mentioned above received support from the Scientific and Technological Research Council of Turkey (TUBITAK) through the TUBITAK-1505 program with the project number 5210029. The authors express their gratitude to Miilux OY Steel for providing the steel plates as part of the technical and research cooperation program between Miilux OY and Gedik Welding. Additionally, the authors extend their appreciation to Mr. Mert Basmac & imath; from Miilux OY Steel for his valuable contributions in preparing the plates for welding.en_US
dc.identifier.doi10.1007/s11665-023-09058-y
dc.identifier.issn1059-9495
dc.identifier.issn1544-1024
dc.identifier.scopus2-s2.0-85180705083en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.urihttps://doi.org/10.1007/s11665-023-09058-y
dc.identifier.urihttps://hdl.handle.net/11501/1113
dc.identifier.wosWOS:001131653000011en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofJournal of Materials Engineering and Performanceen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAustenitic Filler Metalen_US
dc.subjectGas Metal Arc Weldingen_US
dc.subjectHeat Inputen_US
dc.subjectHsla Steelen_US
dc.subjectMicrostructureen_US
dc.subjectAcicular Ferriteen_US
dc.subjectConsumablesen_US
dc.subjectStrengthen_US
dc.titleCharacterization of Fillet Welded Armor Steel Performed by Robotic Gas Metal Arc Welding: Effect of Heat Input on Microstructure and Microhardnessen_US
dc.typeArticleen_US

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