Development and implementation of a magnetoplasmadynamic thruster for welding and cutting

Machado, Ivan Guerra; Lermen, Richard Thomas

doi:10.1016/j.jmatprotec.2007.08.053

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…Neste caso, foi observado que o ponto quente ("hot spot") do arco elétrico formado entre o anodo primário e o catodo primário fazia movimentos aleatórios em relação aos eletrodos. Também, os jatos de plasma gerados pelo arco secundário apresentaram características semelhantes aos jatos obtidos por estudos anteriores com propulsores magnetoplasmadinâmicos [11]. Outro problema constatado foi insuficiente refrigeração do catodo primário e do anodo secundário, nos quais ocorria excessivo desgaste por erosão, com a Figura 6 apresentando alguns eletrodos utilizados e danificados devido a este fenômeno.…”

Section: Testes Iniciais Com a Tocha De Plasma Híbridaunclassified

“…Recentemente [11] um Propulsor Magnetoplasmadinâmico ou MPDT (sigla em inglês para "Magnetoplasmadynamic Thruster"), como é mais conhecido, foi desenvolvido, produzido e aperfeiçoado com o intuito de realizar soldagem e corte de materiais metálicos, no Laboratório de Soldagem & Técnicas Conexas (LS&TC) da Universidade Federal do Rio Grande do Sul (UFRGS). Porém, este dispositivo ainda não apresentou soldagens e cortes com qualidades comparáveis aos processos convencionais (TIG, MIG/MAG etc.…”

Section: Introductionunclassified

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Nova tocha de plasma híbrida para o processamento de materiais

Lermen

Machado

2012

Soldag. insp.

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Resumo Abstract: The main aim of this paper was to present a new device for materials processing. It consist of a hybrid plasma torch which is characterized by the simultaneous formation of two plasma arcs in one device only, generating a (plasma) jet with high energy density. The torch was submitted to the following trials: of operation to identify possible design problems and its operational torch limits; of characterization, consisting in plasma jet length determination; and of viability for materials processing (welding and cutting).Based on these initial trials, some electrical and thermal insulation problems were found and solved. Concerning the results of the characterization trials, the hybrid plasma torch parameters had a significant influence over the plasma jet length. The results obtained in the materials processing trials were satisfactory, i.e., it is possible to carry out welding and cutting with this hybrid plasma torch

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Section: Testes Iniciais Com a Tocha De Plasma Híbridaunclassified

Section: Introductionunclassified

Nova tocha de plasma híbrida para o processamento de materiais

Lermen

Machado

2012

Soldag. insp.

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“…This occurred because the ionised gas was accelerated twice by primary and secondary electric arc, which an electromagnetic and, mainly, electro thermal contribution was observed. Also, according to the mathematic model described by Tikhonov et al (1993) and experimental results obtained by Machado and Lermen (2008), if the gas flow rate is increased and the current intensity is kept constant, the thruster will also increase. For the same model, if only current intensity is increased, the thruster will also increase.…”

Section: Hpt Thrustermentioning

confidence: 99%

“…Recently, Machado and Lermen (2008) developed, produced and improved a magnetoplasmadynamic thruster for welding and cutting of metallic materials. However, this device has not yet submitted welds and cuts with qualities comparable to conventional processes (GTAW, GMAW, etc.).…”

Section: Introductionmentioning

confidence: 99%