Optimization of magnetic arc oscillation process parameters on mechanical properties of AA 5456 Aluminum alloy weldments

Kumar, Adepu; Shailesh, P.; Sundarrajan, S.

doi:10.1016/j.matdes.2008.04.044

Cited by 32 publications

(11 citation statements)

References 4 publications

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“…Experiments carried out by Sundaresan and Ram (1999) with titanium alloy showed that the magnetic deflection applied to TIG welding processes causes significant grain refinement. Similarly, Kumar et al (2008) and Lim et al (2013) also reported the increase in the grain refinement when magnetic deflection was used and, thus, the increase in mechanical strength in alloys under investigation.…”

Section: Introductionmentioning

confidence: 74%

Two Heat Source Models to Simulate Welding Processes with Magnetic Deflection

2017

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The technique of weaving by magnetic arc deflection was developed a few years ago to enable the oscillation of the weld pool, thus, causing grain refinement and improving the properties on the welded joint. This paper aims to propose two heat source models that include effects of magnetic arc deflection on a bead-on-plate GTAW process in numerical simulations by using the finite element method. Two cases are studied. In the first case, non-deflected arc and straigth magnectic deflected arc along the torch movement are carried out and compared to numerical simulations. Temperatures at three different points on the backside of the plates (two away from the welding center line and one in its center) and weld pools of SAE 1020 3.2 mm and 6 mm thick steel plates are analyzed. Results obtained by numerical simulations are close to the experimental ones. In the second case, welding with weaving (frequency of 1Hz) on 3 mm thick steel plates is analyzed. The bead width and its visual presentation are compared to experimental results, which show good agreement with both proposed models.

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Section: Introductionmentioning

confidence: 74%

Two Heat Source Models to Simulate Welding Processes with Magnetic Deflection

2017

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“…Several studies have been conducted to explore the application of magnetic oscillation to control the weld bead geometry and hence mitigate defects, as well as to improve mechanical properties of the weld as a result of grain refinement, for instance. A study analyzed the effect of frequency and amplitude of GTAW arc oscillation on the mechanical properties of the welded material [12]. The results demonstrated a grain refinement as compared with welds realized with constant and pulsed currents, both without arc oscillation.…”

Section: Applications Of Magnetic Oscillationmentioning

confidence: 99%

Gas Tungsten Arc Welding with Synchronized Magnetic Oscillation

Larquer¹,

Reis²

2016

Joining Technologies

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The search for improvements in mechanized/automated welding techniques has been intense due to skilled labour shortage. In this line, the combination of operational modes (polarity and/or metal transfer mode) within a process has gained attention, since it expands the adjustability of the arc energy. By combining this feature with arc motion, the arc energy delivered to the workpiece can be optimally distributed. Therefore, this work exploits the synchronization between arc magnetic oscillation and gas tungsten arc welding (GTAW) process to control weld bead formation. A system was devised to control the magnetic oscillation and a welding power source synchronously. Characterization of the synchronized magnetic oscillation was carried out based on highspeed filming and electrical data. The welding process was then synchronized with the magnetic oscillation varying the level of welding current according to the arc timeposition, being the effect on weld bead width considered for analysis. Welding without oscillation and with unsynchronized magnetic oscillation were taken as references. The synchronized magnetic oscillation made possible to achieve larger weld bead width on the side with higher current level and longer lateral stop time and vice versa. This technique might be beneficial to applications where extreme weld bead control is required.

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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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Optimization of magnetic arc oscillation process parameters on mechanical properties of AA 5456 Aluminum alloy weldments

Cited by 32 publications

References 4 publications

Two Heat Source Models to Simulate Welding Processes with Magnetic Deflection

Two Heat Source Models to Simulate Welding Processes with Magnetic Deflection

Gas Tungsten Arc Welding with Synchronized Magnetic Oscillation

Soldagem TIG com Oscilação Magnética Sincronizada

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