Welding Metallurgy of
01 Jan 1987-
About: The article was published on 1987-01-01 and is currently open access. It has received 991 citations till now. The article focuses on the topics: Welding.
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TL;DR: In this paper, the effects of welding current on macromorphologies, microstructures and mechanical properties of nano-SiC particles strengthening activating flux tungsten inert gas welded AZ31 magnesium alloy joints were investigated by scanning electron microscope and energy dispersive X-ray spectrometer observations and microhardness and tensile tests.
Abstract: Effects of welding current on macromorphologies, microstructures and mechanical properties of nano-SiC particles strengthening activating flux tungsten inert gas welded AZ31 magnesium alloy joints were investigated by scanning electron microscope and energy dispersive X-ray spectrometer observations and microhardness and tensile tests The results showed that SiC particles mainly dwelled in the centre and bottom zone of welding pool Moreover, with the welding current increasing, the mechanical properties of the welding joints were improved by the increased SiC particles in welding pool, the depth/width ratios of weld pool and the refined α-Mg grain size However, the α-Mg grains coarsened and the mechanical properties of joints decreased due to excessive heat input in welding process when welding current over 115 A
7 citations
TL;DR: In this article, the characterization of microstructure and texture across the weldment using electron backscatter diffraction (EBSD) technique was performed on thin sheets of N155 superalloy.
Abstract: Thin sheets of N155 superalloy were welded by AMS 5832 filler metal using gas tungsten arc welding (GTAW). The purpose of this study is to investigate the characterization of microstructure and texture across the weldment using electron backscatter diffraction (EBSD) technique. The results indicated that N155 superalloy with the crystal lattice (FCC) experienced annealing process before the welding, which made a lot of coherent twins be created in the base metal due to low stacking fault energy (SFE). Moreover, the coherent twins were created mainly in the heat-affected zone by the presence of cumulative stresses of the molten pool solidification shrinkage. Having the same crystal lattice (FCC), the base metal and the weld metal resulted in the formation of epitaxial grains with the preferred growth direction in the weld metal.
7 citations
09 Feb 2021
TL;DR: In this paper, Panchuk et al. proposed a method for the extraction of gas from the ground floor of the National Technical University of Oil and Gas of Ukraine (NTHU).
Abstract: DOI 10.17818/NM/2021/1.6 UDK 629.5:621.791.72 Professional paper / Stručni rad Paper accepted / Rukopis primljen: 23. 3. 2020. Myroslav Panchuk Ivano-Frankivsk National Technical University of Oil and Gas Ukraine E-mail: myroslav_panchuk@ukr.net Aleksander Sładkowski Silesian University of Technology Poland E-mail: aleksander.sladkowski@polsl.pl Andrii Panchuk PhD Student Ivano-Frankivsk National Technical University of Oil and Gas Ukraine E-mail: andrii_panchuk@ukr.net Iryna Semianyk PhD Student Ivano-Frankivsk National Technical University of Oil and Gas Ukraine E-mail: ztk@nung.edu.ua
7 citations
TL;DR: In this article, the role of liquation and solidification phenomena on the tensile properties of arc welded cast AZ91 magnesium alloy was investigated and the authors found that due to its refined microstructure, the fusio...
Abstract: This paper aims at understanding the role of liquation and solidification phenomena on the tensile properties of arc welded cast AZ91 magnesium alloy. Owing to its refined microstructure, the fusio...
7 citations
References
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TL;DR: In this article, the state of the art in selective laser sintering/melting (SLS/SLM) processing of aluminium powders is reviewed from different perspectives, including powder metallurgy (P/M), pulsed electric current (PECS), and laser welding of aluminium alloys.
1,172 citations
TL;DR: In this article, the authors show that the pre-existing dislocation network, which maintains its configuration during the entire plastic deformation, is an ideal modulator that is able to slow down but not entirely block the dislocation motion.
557 citations
TL;DR: In this article, the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds is discussed. And a brief review of friction stir spot welding, as an alternative to RSW, is also included.
Abstract: Spot welding, particularly resistance spot welding (RSW), is a critical joining process in automotive industry. The development of advanced high strength steels for applications in automotive industry is accompanied with a challenge to better understand the physical and mechanical metallurgy of these materials during RSW. The present paper critically reviews the fundamental understanding of structure–properties relationship in automotive steels resistance spot welds. The focus is on the metallurgical characteristics, hardness–microstructure correlation, interfacial to pullout failure mode transition and mechanical performance of steel resistance spot welds under quasi-static, fatigue and impact loading conditions. A brief review of friction stir spot welding, as an alternative to RSW, is also included.
369 citations
TL;DR: In this article, a unified equation to compute the energy density is proposed to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.
369 citations
TL;DR: This study attempted to predict solidification defects by DNN regression with a small dataset that contains 487 data points and found that a pre-trained and fine-tuned DNN shows better generalization performance over shallow neural network, support vector machine, and DNN trained by conventional methods.
314 citations