Effect of magnetic stirring on grain structure refinement: Part 1 – Autogenous nickel alloy welds

Lim, Yong Chae; Yu, Xinghua; Cho, Jungho; Sosa, J.M.; Farson, Dave F.; Babu, S. S.; McCracken, Steven L.; Flesner, B.

doi:10.1179/136217110x12720264008277

Cited by 34 publications

(26 citation statements)

References 21 publications

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“…Analysis of autogenous weld results showed that circular scanning frequencies of 2, 4 and 8 Hz, produced welds with a microstructure consisting of a mixture of columnar and equiaxed grains, but at a frequency of 7 Hz, a microstructure consisting of only small, equiaxed grains was observed. 17 The effectiveness of 7 Hz scanning for autogenous weld grain refinement is vividly illustrated in the micrograph displayed in Fig. 2, which shows the re-emergence of the columnar grains (marked by arrows) when circular scanning at 7 Hz frequency was turned off.…”

Section: Microstructure Analysesmentioning

confidence: 96%

Effect of magnetic stirring on grain structure refinement Part 2 – Nickel alloy weld overlays

Lim

Cho

et al. 2010

Science and Technology of Welding and Joining

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The formation of a columnar grain structure in high chromium nickel based alloy welds can be associated with cracking and poor resolution for ultrasonic non-destructive examination. The objective of this research was to characterise the effects of circular magnetic arc deflection (arc stirring) on grain structure of gas tungsten arc weld overlays made on Inconel 690 substrates with 52M filler wire. Welds and weld overlays were made at various arc stirring frequencies, and microstructures were analysed using optical and electron backscattered diffraction microscopy. Significant refinement of grain size occurred at a stirring frequency of 7 Hz. Ultrasonic nondestructive examination confirmed 100% improvement in signal/noise ratio in weld overlays made with magnetic stirring.

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Section: Microstructure Analysesmentioning

confidence: 96%

Effect of magnetic stirring on grain structure refinement Part 2 – Nickel alloy weld overlays

Lim

Cho

et al. 2010

Science and Technology of Welding and Joining

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“…35 These models will be able to predict any tendency for defect formation as well as microstructural heterogeneity. 113 In the next step, some of the sacrifi cial samples that are produced together with the component are characterized nondestructively with ultrasonics, 114 computer-aided tomography using x-ray or neutron tomography, 36 as well as residual stress distribution. 115 The next step in qualifi cation is the data set that can be used for component qualifi cation.…”

Section: Current Challenges and Qualifi Cation Issuesmentioning

confidence: 99%

Metallic materials for 3D printing

2016

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“…[9][10][11][12][13][14]. Entretanto, a oscilação magnética sincronizada com o processo de soldagem TIG não parace ter sido ainda explorada.…”

Section: Soldagem Tig Com Oscilação Magnética Sincronizadaunclassified

Soldagem TIG com Oscilação Magnética Sincronizada

2016

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado. Resumo: Na busca por melhorias de processos e técnicas de soldagem mecanizada/ automatizada, a combinação de modos operacionais, em adição à possibilidade de combinar níveis de corrente de soldagem, tem ganhado espaço. Por meio dessas combinações é possível variar a energia do arco, o que, aliado a movimentos impostos ao próprio arco, pode possibilitar distribuir a energia de forma otimizada para controlar a formação da solda. Uma forma de impor movimento ao arco é por oscilação magnética. Assim, este trabalho explora a sincronização da oscilação magnética com a soldagem TIG. Para tal, foi desenvolvido um sistema para controle simultâneo da oscilação magnética e da fonte de soldagem. Em seguida, foi feita uma caracterização da deflexão (em função da tensão do eletroímã, da corrente de soldagem e do comprimento do arco) baseada em filmagens de alta velocidade e proposto um modelo simples para a deflexão. A oscilação magnética com sincronização foi comparada à sem sincronização, tendo como base de análise o efeito sobre a largura dos cordões de solda. No caso da oscilação sincronizada, foi variado o nível de energia do arco de acordo com sua posição na peça, sendo possível aumentar a largura do cordão no lado da oscilação com maior energia do arco.Palavras-chave: Oscilação magnética; Sincronização; TIG. GTA Welding with Synchronized Magnetic OscillationAbstract: In the search for improvements in processes and mechanized/automated welding techniques, the combination of operational modes, in addition to the possibility of combining welding current levels, has gained attention. Through these combinations it is possible to vary the arc energy, which, along with movements applied to the arc itself, might allow distribute the energy in an optimized way to control the weld formation. One way to apply movement to the arc is by means of magnetic oscillation. Thus, this work exploits the synchronization between magnetic oscillation and the TIG welding process. For that, a system to control the magnetic oscillation and a welding power source simultaneously was devised. In the following, an arc deflection characterization was carried out (varying electromagnet voltage, welding current and arc length) based on high-speed filming and a simplified model for arc deflection proposed. The magnetic oscillation with synchronization was compared to the conventional one (with no synchronization), taking the effect on the weld bead width the basis for analyses. The synchronized oscillation technique successfully allowed vary the arc energy according to its position on the work piece, being possible to increase the weld width on the side of the oscillation with higher arc energy.Key-words: Magnetic oscillation; Synchronization; TIG. IntroduçãoA busca por melhorias de ...

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Effect of magnetic stirring on grain structure refinement: Part 1 – Autogenous nickel alloy welds

Cited by 34 publications

References 21 publications

Effect of magnetic stirring on grain structure refinement Part 2 – Nickel alloy weld overlays

Effect of magnetic stirring on grain structure refinement Part 2 – Nickel alloy weld overlays

Metallic materials for 3D printing

Soldagem TIG com Oscilação Magnética Sincronizada

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