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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TL;DR: In this article, gas tungsten arc butt welded joints of tubes of 7CrMoVTiB10-10 made using bainitic-martensitic P 24-IG filler metal were found to be susceptible to root cracking.
Abstract: Abstract Gas Tungsten Arc butt welded joints of tubes of 7CrMoVTiB10-10 made using bainitic-martensitic P 24-IG filler metal were found to be susceptible to root cracking. This was avoided by using the CMS-IG filler metal and austenitic EPRI P87 filler metal. Detailed coefficient of thermal expansion analysis for both filler metals was performed. Unfortunately, CMS-IG filler metal is characterized by a lower creep rupture strength than P 24-IG. For this reason, the joints were produced by the 141 method with using two filler metals: P 24- IG and EPRI P87. All the welded joints was characterized by the B quality level. Macrostructural, microstructural and hardness data for both welded joints are presented. The standard requirement, < 350 HV10, was marginally not met and was achieved through post weld heat treatment.
8 citations
Cites background from "Welding Metallurgy of"
...Local fluid flow is not strong enough for thorough mixing, but strong enough to move parts of the liquid base metal [29]....
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TL;DR: In this paper , the relative percentage of acicular ferrites decreases from 62.2 to 41.3%, while that of grain boundary ferrites increases from 10.4 to 30.2%, which are enabled by the diminished number of potent nuclei at lower cooling rate and largely responsible for the reduced hardness and toughness.
Abstract: Microstructure evolution roadmap and pertinent mechanical responses in weld metals subjected to various heat inputs have been profiled in EH420 shipbuilding steel by scanning electron microscopy, energy dispersive spectrometry, electron backscatter diffraction and mechanical testing. As the heat input increases from 11.5 to 20 kJ mm–1, relative percentage of acicular ferrites decreases from 62.2 to 41.3%, while that of grain boundary ferrites increases from 10.4 to 30.2%, which are enabled by the diminished number of potent nuclei at lower cooling rate, and largely responsible for the reduced hardness and toughness.
8 citations
TL;DR: In this article , ultra-low dilution rate Inconel 625 coatings with a thickness of 534.4 μm were prepared by high-speed laser cladding technique on the Q245R steel.
Abstract: Abstract In this work, ultra-low dilution rate Inconel 625 coatings with a thickness of ~534.4 μm were prepared by high-speed laser cladding technique on the Q245R steel. The XRD and TEM results show that the Inconel 625 coatings are mainly composed of the Nb and Mo-enriched laves phase with hexagonal close-packed (HCP) structure and the γ-Ni phase with face-centered-cubic (FCC) structure. The cellular crystal, column crystal, and equiaxed dendritic crystal were observed in the bottom, middle, and top of the Inconel 625 coatings from SEM results, respectively. The wear resistance and corrosion resistance of Q245R steel are significantly improved by high-speed laser cladding Inconel 625 coatings. In addition, the low dilution rate is beneficial for improving the wear and corrosion resistance of high-speed laser cladding Inconel 625 coatings. These findings may provide a method to design the wear and corrosion resistance of coatings on steel's surface.
8 citations
Journal Article•
TL;DR: In this article, an attempt has been made to examine the different welding parameters which affect the weldability of 304H Austenitic stainless steel (ASS) welded joint using the proper filler wire.
Abstract: In this research work, an attempt has been made to examine the different welding parameters which affect the weldability of 304H Austenitic stainless steel (ASS) welded joint using the proper filler wire. Chemical composition of filler wire was same as that of base metal. Further this study addressed the combined effect of various welding parameters on the metallurgical and mechanical properties of the weldments. Welding was carried out at different parameters such as welding wire speed, shielding gas flow rate, welding current and arc voltage etc. Tensile tests and V-notch Charpy tests were conducted as per ASTM to determine the mechanical properties of the welded specimens. In order to determine the microstructured changes that occurred, the interface regions of the welded specimens were examined by microscope. As a result, it is reported that changing the shielding gas flow rate and wire feed speed affects the microstructure and mechanical properties of weldment. Impact tests reveal that toughness of the welded joint increases with increasing in welding current, while ultimate tensile strength (UTS) first increases and then decreases.
8 citations
Cites background from "Welding Metallurgy of"
...In welding process shielding gas protects molten metal pool from any atmospheric contamination and also stabilizes the arc and promotes uniform metal transfer [8]....
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...In microstructure of welded sample, cooling rate and heat input play an important role to affect the microstructure [8]....
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01 Jan 2016
TL;DR: In this article, the authors present a table of dedications, acknowledgements, and fields of study in the field of computer science and computer graphics, including the following categories: Dedication, Acknowledgments, and Vita.
Abstract: .............................................................................................................................. ii Dedication ........................................................................................................................... v Acknowledgments.............................................................................................................. vi Vita .................................................................................................................................... vii Fields of Study .................................................................................................................. vii Table of
8 citations
Cites background from "Welding Metallurgy of"
...For the LAS combination with Alloy 625, there was a larger STR across all dilutions with ER70S-6 than ER100S-6....
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...A summary of all STR values at each dilution is provided in Table 13....
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...Microsegregation refers to the redistribution of solute during solidification, which leads to the grain boundaries in the weld having a different composition than the interior of the grains [27, 71]....
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...Another advantage of this buffer layer is the absence of niobium, which Thermo-Calc™ predicted to have a detrimental effect on STR and subsequent solidification cracking....
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...However, the region of the diagram that appears to be most susceptible to solidification cracking is from the range of 50-90% dilution due to a consistently larger STR....
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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