Characteristics of ionized gas metal arc processing

Tanaka, Manabu; Tamaki, Toshiharu; Tashiro, Shinichi; Nakata, Kohei; Ohnawa, Toshio; Ueyama, Tomoyuki

doi:10.1016/j.surfcoat.2008.06.022

Cited by 14 publications

(5 citation statements)

References 5 publications

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“…In the plasma MIG welding, a plasma electrode is installed outside of a MIG contact tip. By using the plasma electrode, inert gas introduce from the torch nozzle is ionized in the upstream region of the MIG arc [4], which is termed "plasma". Figure 1 shows an example of arc and plasma appearance.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Metal Transfer Process in Plasma MIG Welding

Tashiro

Mamat

Murphy

et al. 2022

Metals

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In plasma MIG welding, inert gas introduced from the torch nozzle is ionized in the upstream region of the MIG arc, which is termed “plasma”. This study aims to clarify the effect of the plasma on the metal-transfer process in the plasma MIG welding through numerical analysis. As a result, the plasma with a temperature of approximately 10,000 K was found to be formed around the wire tip. The MIG arc temperature around the wire tip was 11,000 K at the maximum, which was lower than that of the conventional MIG welding by approximately 1000 K. This difference was caused by the decreased current density around the wire tip due to the influence of the plasma. The droplet temperature was also decreased by 400 K due to this lower current density. The amount of the metal vapor evaporated from the droplet was decreased compared to that of the conventional MIG welding due to the lower droplet temperature. This might lead to a decrease in fume formation generally known in the plasma MIG welding. In the conventional MIG welding, the arc attachment was concentrated around the wire tip, leading to a higher current density. However, in the plasma MIG welding, the plasma transported to the surrounding of the wire tip increases the electric conductivity in that region, due to the influence of the metal vapor mixture. This leads to the dispersion of the arc attachment toward the wire root. Consequently, the current density in the plasma MIG welding was found to decrease compared with that of the conventional MIG welding. The lower current density in plasma MIG welding decreases the Lorenz force acting on the wire neck, thus delaying droplet detachment to make the droplet diameter larger and the metal transfer frequency smaller. The latter was about 20 % of that in the conventional MIG welding.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Metal Transfer Process in Plasma MIG Welding

Tashiro

Mamat

Murphy

et al. 2022

Metals

View full text Add to dashboard Cite

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“…However, in the conventional MIG welding, it is difficult to control the droplet temperature because of the unique relationship between the welding current and the wire feed speed 4,5) .…”

Section: Introductionmentioning

confidence: 99%

Numerical Prediction of Feasibility to Lower Droplet Temperature in Duplex Current Feeding MIG Welding Process

Tashiro

Aoki

Kuroawa

et al. 2020

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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“…introduced a process which used the shielding gas added minimum amount of oxygen necessary to stabilize the arc 5) . Tanaka et al reported that the plasma MIG welding process has the ability to stabilize the MIG arc 6) . These studies presented improved arc stability in the Clean MIG process.…”

Section: Introductionmentioning

confidence: 99%

Influence of Welding Materials of Duplex Current Feeding MIG Welding

Kurokawa

Tanaka

2020

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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The duplex current feeding metal inert gas (DCF-MIG) welding which has two current feeding points was developed. This DCF-MIG process is able to control the welding current and wire feeding speed independently by additional feeding current from the secondary tip below the conventional MIG tip. In the past DCF-MIG studies, only the studies using the steel or SUS welding wire material were reported. In this study, the influence of welding wire materials of DCF-MIG was investigated. As a result, the electrical conductivity of welding wire materials was found to have influence on the quantity of Joule heating between current feeding points. However, in the DCF-MIG with low electrical conductivity material, the average of primary current greatly decreases as the increase of the secondary current, consequently the total current of DCF-MIG was suppressed. It was found that there was the optimum value of electrical conductivity of welding material to obtain enough effects of DCF-MIG.

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Characteristics of ionized gas metal arc processing

Cited by 14 publications

References 5 publications

Numerical Analysis of Metal Transfer Process in Plasma MIG Welding

Numerical Analysis of Metal Transfer Process in Plasma MIG Welding

Numerical Prediction of Feasibility to Lower Droplet Temperature in Duplex Current Feeding MIG Welding Process

Influence of Welding Materials of Duplex Current Feeding MIG Welding

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