Journal ArticleDOI
Effect of coarse initial grain size on microstructure and mechanical properties of weld metal and HAZ of a low carbon steel
TLDR
In this article, the effects of coarse initial grain size with varying heat inputs on microstructure and mechanical properties of weld metal and heat-affected zone (HAZ) were investigated.Abstract:
In this study, the effects of coarse initial grain size with varying heat inputs on microstructure and mechanical properties of weld metal and heat-affected zone (HAZ) were investigated. In the welding experiments, SAE 1020 steel specimens in hot-rolled and in grain-coarsened conditions were used. The specimens taken from the hot-rolled steel (original) plate were heat treated at 1100°C for 45 min and then cooled in a furnace in order to obtain a coarse initial grain size. The original and grain-coarsened specimens were welded using a submerged arc welding machine with heat inputs of 0.5, 1 and 2 kJ/mm. Following the welding, microstructure, hardness and toughness of weld metals and HAZs were investigated. From the results, we tried to establish a relationship between initial grain size, microstructure, hardness and toughness of weld metals and HAZs. From the results of the toughness tests, it was seen that the weld metals of coarse initial grain sized specimens and original specimens exhibited nearly the same toughness values with the same heat input, whereas different HAZ toughness values were obtained with the same heat input. Maximum toughness of HAZ of the coarse initial grain sized specimen was achieved with a high input, while maximum toughness of original specimen was obtained with a medium heat input. As a result, considering the heat input, it was observed that the coarse initial grain size had a great influence on the microstructure, hardness and toughness of HAZ of a low carbon steel. Thus, taking into consideration the plate thickness, a higher heat input should be used with respect to the maximum toughness of the HAZ in the welding of grain-coarsened low carbon steels.read more
Citations
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Journal ArticleDOI
Some investigations on microstructure and mechanical properties of submerged arc welded HSLA steel joints
TL;DR: In this article, the influence of the submerged arc welding (SAW) process parameters (welding current and welding speed) on the microstructure, hardness, and toughness of HSLA steel weld joints was investigated.
Journal ArticleDOI
Effect of Pulse Parameters on Weld Quality in Pulsed Gas Metal Arc Welding: A Review
Kamal Pal,Surjya K. Pal +1 more
TL;DR: P-GMAW as discussed by the authors uses a higher peak current to allow one molten droplet per pulse, and a lower background current to maintain the arc stability, which can reduce the weld service life in continuous mode gas metal arc welding.
Journal ArticleDOI
Effects of copper insert layer on the properties of friction welded joints between TiAl and AISI 4140 structural steel
TL;DR: In this paper, a micro and large crack occurred through the interface due to the brittle nature of reaction products and the martensite transformation resulted in volume expansion near the weld zone.
Journal ArticleDOI
Designing of CK45 carbon steel and AISI 304 stainless steel dissimilar welds
TL;DR: In this paper, gas tungsten arc welding of CK45 and AISI304 stainless steel was performed through preparation of different types of samples using ER308L and ERNi-1 wires.
Journal ArticleDOI
Arc stability and its impact on weld properties and microstructure in anti-phase synchronised synergic-pulsed twin-wire gas metal arc welding
TL;DR: In this article, the authors showed that dissimilar currents at lead and trail wires induce stability in the welding arcs, resulting in a considerable influence on weld microstructures, hardness, heat affected zone, and weld penetration-width ratio.
References
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Book
Metallography, principles and practice
Vander Voort,F George +1 more
TL;DR: A comprehensive source of information on metallographic techniques and their application to the study of metals, ceramics and polymers, this work is thoroughly referenced and well-illustrated with an extensive collection of micrographs and macrographs as discussed by the authors.
Book
Introduction to the physical metallurgy of welding
TL;DR: The second edition has been updated and expanded to cover new topics such as the numerical analytical techniques now being used in industry as mentioned in this paper, which should be of use to welding professionals and those studying metallurgy and materials science.
Journal ArticleDOI
The nature of acicular ferrite in HSLA steel weld metals
TL;DR: In this paper, the nature of the fine interlocking acicular ferrite microstructure in HSLA steel weld metals is investigated and it is shown that the active nucleation sites for this ferritic product are weld metal inclusions.
Journal ArticleDOI
A model for the development of microstructure in low-alloy steel (Fe-Mn-Si-C) weld deposits
TL;DR: In this paper, the microstructural variations in a series of low-alloy steel weld deposits containing different carbon concentrations (produced using experimental electrodes) are discussed in terms of a phenomenological model based on phase transformation theory.