Structure of the Welding Arc Cathode Spot with a Nonconsumable Electrode

Балановский, А. Е.

doi:10.1134/s0018151x17060025

Cited by 14 publications

(10 citation statements)

References 21 publications

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“…However, the average values of current per spot increased to 6.5 A, 8.4 A and 7.9 A at times (B), (C) and (D) corresponding to a current of 200 A. From this, the current density of cathode spots could be determined accurately if the size of the cathode spot crater was measured by the autograph method in [18]. The ratio of the number of cathode spots located in the weld pool to the total number of cathode spots at each time (A), (B), (C) and (D) was 100%, 77.8%, 57.4% and 37.4%, respectively.…”

Section: Resultsmentioning

confidence: 92%

“…Until now, most studies on cathode spots have been carried out for AC TIG welding of aluminum through experimental observations by using a high-speed video camera (HSVC) with various frame rates [13][14][15][16][17][18]. In an early study by Ushio et al using an HSVC with a frame rate of 8000 fps, the cathode spots were observed to first generate in the weld pool and then extend radially to the oxide-cleaning zone with time.…”

Section: Introductionmentioning

confidence: 99%

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Investigating cathode spot behavior in argon alternating current tungsten inert gas welding of aluminum through experimental observation

Phan

Tashiro

Bui

et al. 2019

J. Phys. D: Appl. Phys.

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The behavior of cathode spots in stationary argon alternating current tungsten inert gas welding of aluminum was clarified in this study. The temporal variation in cathode spot distribution during electrode positive (EP) polarity was, for the first time, revealed quantitatively based on high-speed video camera observation with a frame rate of 500 000 fps. In addition, the weld pool surface temperature at the start and end of EP polarity was also measured using the two-wavelength temperature measurement method to clarify the relationship with the cathode spot behavior. As a result, the general tendency of the life cycle of the cathode spot was clarified. The first cathode spot appeared and divided outside the weld pool. Following this, they moved rapidly toward the weld pool center within 100 µs. After that, the cathode spot group became an uneven and ringshaped distribution, which expanded outward with time with a velocity of approximately 1 m s −1 . The cathode spots have a random movement with the average velocities of each cathode spot on the liquid and solid surface being about 142 ± 59 m s −1 and 87 ± 44 m s −1 , respectively. The ratio of the number of cathode spots located in the weld pool to the total number of cathode spots decreased from 100% to 37.4% with elapsed time, except right at the beginning. Furthermore, the temperature of the center surface of the weld pool was 1400 K, and this gradually increased to a slightly higher temperature than the melting point of aluminum around the weld pool boundary at the start of EP polarity. The maximum temperature at the center is considered to be linked with absence of a cathode spot. The temperature at the center decreased by 150 K at the end of EP polarity due to the temporal expansion in the ring-shaped distribution of the cathode spot group leading to a decrease in heat input around the center.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Investigating cathode spot behavior in argon alternating current tungsten inert gas welding of aluminum through experimental observation

Phan

Tashiro

Bui

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The materials used as additives are high-tech products. They are either produced from nonrenewable natural resources whose reserves are limited, or using expensive technological processes [1][2][3][4][5]. This is especially true for ultrafine materials.…”

Section: Introductionmentioning

confidence: 99%

The Use of Silicon Production Waste as an Effective Additive in the Manufacture and Machining of Various Materials

Konstantinova

Гусева

Astafeva

2022

MSF

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The article describes the results of experiments on the use of silicon production waste as an additive that improves the structure and properties of materials and the efficiency of welding process. The flotation technology can be used to separate gas cleaning dust, which is a silicon production waste product, into commercial products. The chamber product, containing ultrafine silica, was used as a modifying additive in concrete. It improved its structure and increased its strength compared to the samples without additives. The modifier made from chamber products introduced into gray cast iron made it possible to obtain graphite of a more favorable shape as compared to the lamellar form of graphite in traditional gray cast iron. Its strength increased. The experimental results on the welding process with an activating flux, which includes ultrafine silica isolated from the metallurgical waste, are presented. The activating flux improved the penetrating ability of the welding arc by 1.5-3 times, the energy consumption decreased by 30-50%.

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“…Magnesium is one of the major elements of aluminum alloy for industrial use, since it is able to greatly improve the strength of aluminum. Most studies on cathode spots in AC TIG welding focused on the oxide cleaning action on the aluminum surface by using a high-speed video camera (HSVC) with various frame rates [8][9][10][11] . Ushio et al observed the AC TIG welding on several kinds of aluminum alloy by a HSVC with a frame rate of 8,000 fps.…”

Section: Introductionmentioning

confidence: 99%

Influence of the magnesium content on cathode spot behavior in AC TIG welding of aluminum alloy

Phan

Tashiro

Bui

et al. 2019

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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The influence of magnesium contents on cathode spot (CS) behavior in aluminum AC TIG welding was investigated by High-Speed Video Camera (HSVC) observation with the maximum frame rate of 500,000 fps. The number of CS in A5052 case was larger than that in A1050, leading to the smaller average current per spot of 6.9 A comparing with 16.7 A in A1050. The larger current per spot is considered to cause the CS higher velocity. The average velocity of CS on liquid surface of A5052 was 110±37 m/s far lower than that in A1050 case. The central area, where the CS did not exist, had a radius of 2.0 mm and expanded over EP time. The existence of magnesium in A5052 led to the increase in the cathode spot number inside the weld pool. The predicted mechanism could be the more easy evaporation of magnesium than that of aluminum.

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Structure of the Welding Arc Cathode Spot with a Nonconsumable Electrode

Cited by 14 publications

References 21 publications

Investigating cathode spot behavior in argon alternating current tungsten inert gas welding of aluminum through experimental observation

Investigating cathode spot behavior in argon alternating current tungsten inert gas welding of aluminum through experimental observation

The Use of Silicon Production Waste as an Effective Additive in the Manufacture and Machining of Various Materials

Influence of the magnesium content on cathode spot behavior in AC TIG welding of aluminum alloy

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