Development of A New High-Frequency, High-Peak Current Power Source for High Constricted Arc Formation

Onuki, Jin; Anazawa, Yoshisa; Nihei, Masayasu; Katou, Mitsuo; Ônuma, Akira; Funamoto, Takao

doi:10.1143/jjap.41.5821

Cited by 26 publications

(19 citation statements)

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“…7, to analyze the effect of arc constriction on the axial electromagnetic force, (19) is represented with (6) that could support the curve of force and its first derivative. The effect of the arc constriction on the radial force is shown in Fig.…”

Section: Axial Electromagnetic Force Inside the Arc Plasmamentioning

confidence: 99%

“…The correlation between them has also been found in conventional gas tungsten arc welding (C-GTAW) [15]- [18] to affect the trend of electromagnetic force. In addition, the arc force has obviously increased in high frequency pulsed welding [19], especially at ultrahigh frequencies ( f > 20 kHz). The electromagnetic force had been found to be the most important factor.…”

Section: Introductionmentioning

confidence: 99%

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Study on Electromagnetic Force in Arc Plasma With UHFP-GTAW of Ti-6Al-4V

Yang

Cong

et al. 2013

IEEE Trans. Plasma Sci.

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Ti-6Al-4V titanium alloy is processed by ultrahighfrequency pulsed gas tungsten arc welding (UHFP-GTAW), and the correlation between electromagnetic force and pulsed welding efficacy is studied. A mathematical model is formulated to analyze the macroscopic and internal electromagnetic forces. The axial and radial electromagnetic forces inside the arc plasma are evaluated with arc constriction. Meanwhile, the arc profile is also experimentally observed by a camera system to be the experimental evidence for the pinch effect. Owing to arc constriction during the UHFP-GTAW process, the axial component of the macroscopic electromagnetic force decreases, and the arc area diminishes, reducing the root radius. Therefore, larger axial pressure is found. The radial electromagnetic force inside the arc plasma is the most important factor for arc constriction. In addition, the reduced root radius makes the radial electromagnetic force to get reduced with increased pulsed frequency. The attenuation coefficient of magnetic force could be a key parameter for evaluating strength of the arc constriction. With decreased root radius with the UHFP-GTAW, the axial electromagnetic force inside the arc plasma can be maintained at a high level, which affects surface and mobility of the molten pool. The electromagnetic force is observed to have a close correlation with the root radius of the arc, which depends on the pulsed frequency.Index Terms-Arc constriction, electromagnetic force, Ti-6Al-4V ultrahigh-frequency pulsed gas tungsten arc welding (UHFP-GTAW). 0093-3813

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Section: Axial Electromagnetic Force Inside the Arc Plasmamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Electromagnetic Force in Arc Plasma With UHFP-GTAW of Ti-6Al-4V

Yang

Cong

et al. 2013

IEEE Trans. Plasma Sci.

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“…Este resultado está de acordo com os obtidos em trabalhos teóricos [12] e experimentais [1] disponíveis na literatura, ao mesmo tempo em que discorda de outros [13,14] que obtiveram uma distribuição radial de pressão conforme uma curva exponencial dupla. Diante destas divergências, acredita-se que a distribuição da pressão do arco deva sofrer influência de parâmetros como a distância eletrodopeça, intensidade da corrente de soldagem e as características geométricas do eletrodo (diâmetro e ângulo de afiação).…”

Section: Figura 8 Distribuição Radial Da Pressão Do Arcounclassified

“…Entretanto, há dificuldades relacionadas à medição desta grandeza associadas, sobretudo, às elevadas temperaturas presentes no arco voltaico e na poça de fusão, o que impossibilita a aplicação direta de sensores comerciais, dada as suas relativas baixas temperaturas máximas de operação. Visando contornar estas dificuldades, em trabalhos disponíveis na literatura [1,10,[12][13][14][15] é proposta uma técnica de medição da pressão do arco, que embora utilizem diferentes meios para realizar a medição propriamente dita, faz uso de um método comum. Essencialmente, esta técnica baseia-se na medição da pressão exercida pelo arco voltaico sobre um orifício, normalmente de 1 mm de diâmetro, posicionado na peça de trabalho (ânodo).…”

Section: Introductionunclassified

Dispositivo para medição da pressão do arco e sua aplicação no estudo do processo TIG

Cunha

Bohórquez

2014

Soldag. insp.

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Resumo Diante da importância da pressão de estagnação do arco na formação da poça de fusão ou de defeitos no cordão, e das dificuldades Palavras-chave: Pressão de estagnação; Medição de pressão; Arco voltaico. Abstract: Considering the importance of the stagnation pressure of the arc in the formation of the weld pool or defects in the weld bead, and the difficulties associated with its measurement, mainly due to the high temperatures present in the arc, there was developed in this work a device designed to measure this pressure and an initial application in order to better understand the behavior of the pressure exerted by the arc on the surface of the weld pool. Experiments were realized in this study to identify the radial distribution of the stagnation pressure and its magnitude according to some welding variables, namely piece-electrode distance and size of the gas nozzle.The results indicate that the stagnation pressure of the arc is strongly influenced by the piece-electrode distance and to a lesser degree, the size of the gas nozzle and its radial distribution can be described by a Gaussian curve.

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“…As a result, arc force was downward as large driven force for the fluid. With highfrequency pulse welding process, the higher frequency, the larger arc force was obtained [20,21]. Axial arc force could make surface deformation of molten pool, and weld depth was determined by composite vortex intensity.…”

Section: Introductionmentioning

confidence: 99%

Effect of fluid in molten pool on the welds with Ti-6Al-4V during pulsed arc welding

Yang

Zhou

2015

Int J Adv Manuf Technol

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Titanium alloy is one of the most popular materials in engineering applications. Pulsed arc welding can obtain grain refinement of titanium that is a benefit for mechanical properties. However, the study found that the optimized effect decreased with some higher frequencies. Hence, the study of Ti-6Al-4V was carried out with higher-frequency region, and the reason was discussed. The fluid of molten pool had effect on microstructure and mechanical properties of welding joints. Simultaneously, the arc behavior with pulsing current was known as the important factor for the fluid status. Thus, the microstructural morphology, microhardness gradient, and mechanical properties were detected, which were also compared with other frequencies. With high frequency more than 50 kHz, the fluidity of molten pool decreased significantly with low ductility of joints. The mechanism simulation was produced with plane and ellipsoid assumptions, and the results indicated that the conflux caused impact region of double circulation, which was recognized as the main reason for the drops of microstructure and properties with more than 50 kHz.

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Development of A New High-Frequency, High-Peak Current Power Source for High Constricted Arc Formation

Cited by 26 publications

References 1 publication

Study on Electromagnetic Force in Arc Plasma With UHFP-GTAW of Ti-6Al-4V

Study on Electromagnetic Force in Arc Plasma With UHFP-GTAW of Ti-6Al-4V

Dispositivo para medição da pressão do arco e sua aplicação no estudo do processo TIG

Effect of fluid in molten pool on the welds with Ti-6Al-4V during pulsed arc welding

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