Effect of Heat Input and Shielding Gas on the Performance of 316 Stainless Steel Gas Tungsten Arc Welding

Fouad, Ramy A.; El-Nikhaily, Ahmed E.; Ahmed, Essam; Shaban, A.

doi:10.21608/jpme.2020.23038.1024

Cited by 4 publications

(1 citation statement)

References 13 publications

(14 reference statements)

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“…Ferrite content was observed in HAZ of DSS 2205, whereas AISI316L was composed of coarse austenite grains with a little number of lamellar ferrite precipitates and weld metal showed phases of austenite and δ-ferrite with fine equiaxed grains. Fouad et al 28 studied the influences of heat input on mechanical and metallurgical properties of AISI 316 weld joint welded by the GTAW process using two types of shielding gases (pure argon and 98%Ar-2%N2). Thakare et al 29 welded P 91 steel and SS 304L using GTAW in the as-welded and post-welded heat-treated conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of post-weld heat treatment on the metallurgical studies of dissimilar weldments of SS 316L welded with DSS 2205

Singh

Goyal

Rana

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present work discusses the macrostructure, microstructure, and microhardness of dissimilar metal weld joints between AISI 316L SS-DSS 2205 developed by gas tungsten arc welding (GTAW) welding. Post-weld heat treatments (PWHT) were carried out at temperatures of 750°C for 24 h and 850°C for 0.5 h. The macrostructure and microstructure of the welding joints at different welding conditions were observed by scanning electron microscope. The macrostructure study results indicated that all the welded joints were fully penetrated and free from defects. However, the microstructure investigation revealed a solid-state transformation of ferrite into grain boundary austenite, widmanstatten austenite, intergranular austenite, and partially transformed austenite. The post-weld heat treatment processes enhanced the precipitation of the sigma phase in the ferrite matrix. Secondly, the microhardness across and along the weld bead has been evaluated, and the results are compared. It was observed that the microhardness of the heat-affected zone of DSS 2205 is found to be higher as compared to a heat-affected zone of AISI 316L, the weld metal zone, and base metals at all welding currents (i.e. 90 A, 109 A, and 132 A). The microhardness values decrease when transverse from the face of the weld toward the root pass. Microhardness values at the fill (top) pass of the weld zone at 90 A, 109 A, and 132 A were 268.3 HV, 257 HV, and 255 HV respectively. It was found that the microhardness has improved significantly after post-weld heat treatments and was highest for 750°C/24 h. It may be due to higher holding time which led to the involvement of carbides.

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Section: Introductionmentioning

confidence: 99%

Effect of post-weld heat treatment on the metallurgical studies of dissimilar weldments of SS 316L welded with DSS 2205

Singh

Goyal

Rana

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Dissimilar welding of high nitrogen stainless steel and low alloy high strength steel under different shielding gas composition: Process, microstructure and mechanical properties

et al. 2023

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The influence of various welding wires on microstructure, and mechanical characteristics of AA7075 Al-alloy welded by TIG process

Fouad,

Habba,

Elshaghoul

et al. 2024

Sci Rep

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Owing to their exceptional mechanical properties, the various welding wires used to combine aluminum can meet the needs of many engineering applications that call for components with both good mechanical and lightweight capabilities. This study aims to produce high-quality welds made of AA7075 aluminum alloy using the GTAW technique and various welding wires, such as ER5356, ER4043, and ER4047. The microstructure, macrohardness, and other mechanical characteristics, such as tensile strength and impact toughness, were analyzed experimentally. To check the fracture surface of the AA7075 welded joints, the specimens were examined using optical and scanning electron microscopy (SEM). A close examination of the samples that were welded with ER5356 welding wire revealed a fine grain in the weld zone (WZ). In addition, the WZ of the ER4043 and ER4047 welded samples had a coarse grain structure. Because the hardness values of the welded samples were lower in the WZ than in the base metal (BM) and heat-affected zone (HAZ), the joints filled with ER5356 welding wire provided the highest hardness values compared to other filler metals. Additionally, the ER4047 filler metal yielded the lowest hardness in the weld zone. The welding wire of ER5356 produced the greatest results for ultimate tensile stress, yield stress, welding efficiency, and strain-hardening capacity (Hc), whereas the filler metal of ER4043 produced the highest percentage of elongation. In addition, the ER4047 fracture surface morphology revealed coarser and deeper dimples than the ER5356 fine dimples in the welded joints. Finally, the highest impact toughness was obtained at joints filled with the ER4047 filler metal, whereas the lowest impact toughness was obtained at the BM.

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Effect of Heat Input and Shielding Gas on the Performance of 316 Stainless Steel Gas Tungsten Arc Welding

Cited by 4 publications

References 13 publications

Effect of post-weld heat treatment on the metallurgical studies of dissimilar weldments of SS 316L welded with DSS 2205

Effect of post-weld heat treatment on the metallurgical studies of dissimilar weldments of SS 316L welded with DSS 2205

Dissimilar welding of high nitrogen stainless steel and low alloy high strength steel under different shielding gas composition: Process, microstructure and mechanical properties

The influence of various welding wires on microstructure, and mechanical characteristics of AA7075 Al-alloy welded by TIG process

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