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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.
Citations
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01 Jan 2008

13 citations


Cites background from "Welding Metallurgy of"

  • ...It can be attributed to the existence of the Marangoni and Buoyancy forces into the melt pool (Kou 2003)....

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  • ...(9.1) Consequently, the solidification structure changes from the dendrite structure to cellular from the surface to the interface throughout the melt zone (Kou 2003)....

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Journal ArticleDOI
TL;DR: In this paper, Annealing twins brought CSL boundaries into austenitic stainless steels and showed that the resulting steels indicated remarkably high resistance to intergranular corrosion even to weld decay and knife line attack during welding.
Abstract: Grain boundary phenomena strongly depend on grain boundary structure and characteristics, i.e. coincidence site lattice (CSL) boundaries, as contrasted with random boundaries, are highly resistant to intergranular degradation. Grain boundary engineering (GBE) primarily intends to prevent the initiation and propagation of intergranular degradation along random boundaries by frequent introduction of CSL boundaries into the grain boundary networks in materials. A high frequency of CSL boundaries by GBE processing leads to high resistance to grain boundary degradations. Annealing twins bring CSL boundaries into austenitic stainless steels. By twin induced GBE utilising optimised single step thermomechanical processing consisting of a slight strain followed by annealing, a very high frequency of CSL boundaries was introduced into austenitic stainless steels. The resulting steels indicated remarkably high resistance to intergranular corrosion even to weld decay and knife line attack during welding. Grai...

13 citations


Cites background from "Welding Metallurgy of"

  • ...Weld decay which is severe intergranular corrosion in the heat affected zone (HAZ) is a conventional and momentous problem during welding of austenitic stainless steels.(1,2) The intergranular corrosion is generally attributed to sensitisation....

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Journal ArticleDOI
TL;DR: In this article, stainless steel coatings were deposited by high velocity oxy fuel (HVOF) technique on ZE41 magnesium alloy substrates without causing any degradation on its microstructure and without modifying its mechanical properties.
Abstract: Stainless steel coatings were deposited by high velocity oxy fuel (HVOF) technique on ZE41 magnesium alloy substrates. Different coatings with different thicknesses were sprayed on the magnesium alloy without causing any degradation on its microstructure and without modifying its mechanical properties. The wear behavior of the 316L stainless steel coatings was tested using the ball-on-disk configuration technique in dry conditions. Bulk 316L stainless steel and ZE41 magnesium alloys were also tested for comparative purposes. In the best conditions, the coatings provided up to 93% more wear resistance than uncoated ZE41 (at low loads and speeds) and only 11% below bulk 316L stainless steel (at high loads and speeds). The number of the layers that formed the coatings brings a change in the predominant wear mechanism through the appearance of a mechanical mixing layer (MML) that significantly reduces the wear rate.

13 citations

01 Jan 2014
TL;DR: In this paper, the method of nanopowder introduction to a welding pool (during the production) via liquid glass, using mechanical activation installation of cavitation type, is described, and obtained mechanical properties and chemical composition of a weld metal formed by welding electrodes using nanodisperse materials are presented.
Abstract: One of the most significant characteristics of a weld is its strength. Mechanical properties of weld metal may be improved in various ways. This article describes a technological scheme for electrodes production. Here the method of nanopowder introduction to a welding pool (during the production) via liquid glass, using mechanical-activation installation of cavitation type, is described. Obtained mechanical properties and chemical composition of a weld metal formed by welding electrodes using nanodisperse materials are presented.

13 citations


Additional excerpts

  • ...All operations for coating electrodes [2]....

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Dissertation
30 Nov 2015
TL;DR: In this article, the influence of the powder material and the main processing parameters on geometrical features and dilution of the clads is investigated and discussed and useful tools for cladding operators and engineers are proposed.
Abstract: the influence of the powder material and the main processing parameters on geometrical features and dilution of the clads is investigated and discussed. Physical and analytical model that allow the explanation of the process and the prediction of the clad geometry and dilution is discussed. Using these models, useful tools for cladding operators and engineers are proposed. The energetic balance of the process is presented. Energetic redistribution in laser cladding process is analysed in detail, and quantification of process efficiency and energy losses is given. The influence of the processing parameters and the chemical/physical properties of the materials is considered throughout the various experiments performed. Some selected properties of the coating produced in different processing conditions are analysed. In specific, the variation of the chemical composition of the clad due to substrate dilution is considered, and its effect on the characteristics of the coatings is discussed.

13 citations

References
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Journal ArticleDOI
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

Journal ArticleDOI
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

Journal ArticleDOI
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

Journal ArticleDOI
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

Journal ArticleDOI
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