Contribution for Heat Transfer and Heat Flux to Anode Affected by Rise Current Transition Time in Pulsed Arc

Momii, Taira; Iwao, Toru; Yumoto, Motoshige

doi:10.1541/ieejpes.133.409

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…vapor expand to the periphery) to t peak = t base = 0.15 -9.9 ms (f = 50 Hz to 2000 Hz). 9 In so doing, the ration between peak and base current time (duty ratio) was 0.5. In calculations, initial values were temperature, pressure, potential, and metal vapor concentration in the entire calculation area.…”

Section: Calculation Methodsmentioning

confidence: 99%

“…As a result, electromagnetic force calculated as the vector product of current density and magnetic flux density-the only force in the depth direction of welding pool-was reported to increase. 9 However, that research ignored incorporation of metal vapor from the base material in modeling of arc phenomena. In addition, pulsed current increases and decreases over time, but only the transition period of increasing current was considered.…”

Section: Introductionmentioning

confidence: 99%

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Contribution of Metal Vapor Mass at Periphery Part of Pulsed Arc to Electromagnetic Force in Weld Pool

et al. 2018

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The arc welding has been used in various welding methods because it is inexpensive and high in strength after welding. However, it is a problem that accidents such as collapse of the bridge occur because of the welding defects. The welding of low cost and high productivity is required without the welding defects. The pulsed TIG welding is inexpensive and capable of high-quality welding. The electromagnetic force contributing to penetration changes because the transient response of arc temperature and iron vapor generated from anode occurs. However, the analysis of pulsed TIG welding with metal vapor has been elucidated only metal vapor concentration near anode with transient phenomenon and heat flux. Thus, the theoretical elucidation of penetration depth with control factor has not been researched. In this paper, the contribution of metal vapor mass at the periphery part of pulsed arc to the electromagnetic force in the weld pool is elucidated. As a result, the iron vapor mass at periphery part decreased with increasing the frequency. The iron vapor was stagnated at axial center within one cycle. The electromagnetic force to the penetration depth direction in weld pool increased at axial center. Therefore, the metal vapor mass at periphery part plays an important role for the electromagnetic force increment at axial center. K E Y W O R D S current density, electromagnetic force, electromagnetic thermal fluid simulation, metal vapor mass, pulsed arc Yoshifumi Maeda, student member: In 2016, he graduated from Tokyo City University (Faculty of Engineering, Department of Electrical and Electronic Engineering), completed master's course at the University (Graduate School of Engineering, Department of Electrical and Electronic Engineering) in 2018, and started doctorate at the University (Graduate School of Integrative Science and Engineering, Electrical Engineering and Chemistry). He is engaged in research in electromagnetic thermal fluid simulations of arc discharge.

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Section: Calculation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Contribution of Metal Vapor Mass at Periphery Part of Pulsed Arc to Electromagnetic Force in Weld Pool

et al. 2018

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“…From these results, we see that, from 0.0 to 0.7 ms after current cut-off (peak time), at all exposure times, an S/N ratio was obtained whereby temperature calculation is possible, and the electrons and heavy particles are in an equilibrium state where sufficient energy exchange occurs due to inelastic collisions. 18,19 Next, when 0.7 to 0.8 ms after the current cut-off (peak time), when the exposure time was 0.1 and 0.133 ms, the S/N ratio worsened due to the reduction in the amount of light. Here, temperature calculation was not possible and the reliability of the Boltzmann plot was low.…”

Section: Temperature At Arc Current Cut-offmentioning

confidence: 97%

Arc Temperature Measurement with Microsecond Spectroscopic Measurement

et al. 2019

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The quality of electric power caused by frequency fluctuation and voltage rise will be degraded because of the lightning surge and the mass introduction of distributed power. Thus, it is necessary to improve the performance of gas circuit breaker in order to maintain the stable supply of electric power. It has been reported that the arc conductance is calculated as the index of the current interruption in numerical analysis. However, few report have the measured value in the current interruption. This is because that the current interruption is the steep phenomenon of micro seconds range. Thus, it is necessary to establish the time-high precision and noncontact measurement method. In this paper, the arc temperature is measured near current zero using the microsecond spectroscopic measurement. As a result, the microsecond spectroscopic measurement which combines the conventional spectroscope and the high speed video camera is 200 times faster than the measurement of conventional spectroscope. For this reason, the microsecond spectroscopic measurement is possible with the high speed video camera. Therefore, it is possible to measure the arc temperature with decreasing the current using the microsecond spectroscope. K E Y W O R D Sarc temperature, Boltzmann plot, GCB, microsecond spectroscopic measurement, spectrum

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“…In addition, in terms of power supply performance, current transition time dt can be set to 1/10 pulsed current wavelength. If this current transition time is short, then arc's transient response becomes pronounced, and thus we set it to 0.1 ms; in order to obtain a realistic frequency band, we set peak and base current time (when arc temperature and metal vapor expand to the periphery) to t peak = t base = 0.15 – 9.9 ms ( f = 50 Hz to 2000 Hz) . In so doing, the ration between peak and base current time (duty ratio) was 0.5.…”

Section: Calculation Modelmentioning

confidence: 99%

“…With pulse TIG welding, current abruptly changes during transition period (rise time of pulsed current); thus, the previous research said that arc current density and related flux density could not be tracked. As a result, electromagnetic force calculated as the vector product of current density and magnetic flux density—the only force in the depth direction of welding pool—was reported to increase . However, that research ignored incorporation of metal vapor from the base material in modeling of arc phenomena.…”

Section: Introductionmentioning

confidence: 99%

Contribution of metal vapor mass at periphery part of pulsed arc to electromagnetic force in weld pool

Tanaka

Maeda

Yamamoto

et al. 2019

Electrical Engineering Japan

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The arc welding has been used in various welding methods because it is inexpensive and high in strength after welding. However, it is a problem that accidents such as collapse of the bridge occur because of the welding defects. The welding of low cost and high productivity is required without the welding defects. The pulsed TIG welding is inexpensive and capable of high-quality welding. The electromagnetic force contributing to penetration changes because the transient response of arc temperature and iron vapor generated from anode occurs. However, the analysis of pulsed TIG welding with metal vapor has been elucidated only metal vapor concentration near anode with transient phenomenon and heat flux. Thus, the theoretical elucidation of penetration depth with control factor has not been researched. In this paper, the contribution of metal vapor mass at the periphery part of pulsed arc to the electromagnetic force in the weld pool is elucidated. As a result, the iron vapor mass at periphery part decreased with increasing the frequency. The iron vapor was stagnated at axial center within one cycle. The electromagnetic force to the penetration depth direction in weld pool increased at axial center. Therefore, the metal vapor mass at periphery part plays an important role for the electromagnetic force increment at axial center. K E Y W O R D Scurrent density, electromagnetic force, electromagnetic thermal fluid simulation, metal vapor mass, pulsed arc Yoshifumi Maeda, student member: In 2016, he graduated from Tokyo City University (Faculty of Engineering, Department of Electrical and Electronic Engineering), completed master's course at the University (Graduate School of Engineering, Department of Electrical and Electronic Engineering) in 2018, and started doctorate at the University (Graduate School of Integrative Science and Engineering, Electrical Engineering and Chemistry). He is engaged in research in electromagnetic thermal fluid simulations of arc discharge.

show abstract

Contribution for Heat Transfer and Heat Flux to Anode Affected by Rise Current Transition Time in Pulsed Arc

Cited by 4 publications

References 9 publications

Contribution of Metal Vapor Mass at Periphery Part of Pulsed Arc to Electromagnetic Force in Weld Pool

Contribution of Metal Vapor Mass at Periphery Part of Pulsed Arc to Electromagnetic Force in Weld Pool

Arc Temperature Measurement with Microsecond Spectroscopic Measurement

Contribution of metal vapor mass at periphery part of pulsed arc to electromagnetic force in weld pool

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