Pulsed arc welding.

Matsunawa, Akira; Yamamoto, H; Hiramoto, Seigo

doi:10.2207/qjjws1943.53.284

Cited by 21 publications

(7 citation statements)

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“…One of the most efficient welding technologies, developed back in the 1960s and received further propagation in our country and abroad [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], is a consumable electrode gas-shielded pulsed arc welding (PAW). The rising interest to its application in the last time is to large extent related with robotization of arc welding and coming into industry of improved welding equipment, including the sources of pulsed welding current.…”

Section: Abstract : Pulsed Arc Welding Consumable Electrode mentioning

confidence: 99%

Effect of parameters of welding circuit on formation of welding current pulses

Tsybulkin¹

2016

The Paton Welding J.

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This work studies a poorly investigated effect of welding arc parameters on amplitude of welding current pulses in consumable electrode gas-shielded pulsed arc welding (PAW). A welding circuit is considered as a frequency-selective system, which passes the pulses in undistorted form only in specific frequency band. The pulses out of this band are significantly suppressed, that can result in rapid decrease of PAW efficiency. The main aim of the work is to determine a width of welding circuit pass band and possibility of its increase. In scope of developed mathematical model a criterion was obtained, which sets in algebraic form one of the necessary conditions of PAW efficient application. From practical point of view, this criterion allows, using known parameters of welding circuit, carrying out a fairly simple evaluation of pass band upper boundary, inside which a set amplitude of welding current pulses is ensured. From the other side, indicated criterion can be used for solving an inverse problem, i.e. to determine the allowable values of some parameters of welding circuit using preliminary selected frequency of welding current pulse passing. Besides, due to its «analytical property» the indicated criterion can be useful for theoretical investigations of pulse-arc processes taking place in the welding circuit. 19 Ref., 5 Figures. K e y w o r d s : pulsed arc welding, consumable electrode, welding circuit, welding current amplitude, pulse repetition frequency, mathematical modelOne of the most efficient welding technologies, developed back in the 1960s and received further propagation in our country and abroad [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], is a consumable electrode gas-shielded pulsed arc welding (PAW). The rising interest to its application in the last time is to large extent related with robotization of arc welding and coming into industry of improved welding equipment, including the sources of pulsed welding current. These sources are characterized by new possibilities in welding mode regulation and, in particular, possibility of program setting of current amplitude in the pulse, pulse duration, background current and pulse setting frequency. It is well known fact that the optimum transfer of electrode metal during PAW is achieved at specific combination of indicated parameters.A lot of publications were dedicated to the problems of stabilizing, adaptive regulation and practical realization of PAW [4,6,8,9]. But, at the same time, particularly important question, related with effect of welding circuit parameters on formation of the pulses of welding current, have almost no description in the reference literature. The matter is that the welding circuit in dynamic relationship represents itself a frequency-selective system which passes the undistorted pulses only in specific frequency band [12]. Out of this band the pulses will be significantly suppressed, that can result in rapid decrease of PAW efficiency.Meanwhile, it is difficult to say what the width of indicated frequency band is an...

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Section: Abstract : Pulsed Arc Welding Consumable Electrode mentioning

confidence: 99%

Effect of parameters of welding circuit on formation of welding current pulses

Tsybulkin¹

2016

The Paton Welding J.

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“…[13][14][15][16][17][18][19] In contrast to this, in CO 2 pulse welding, 1 pulse/1 droplet transfer was observed during a period of 2-6 ms in the first half of the peak current period. In the second half of the peak current period, after droplet transfer, the droplet was pushed upward on the wire by the strong arc force as it grew.…”

Section: Droplet Transfer Phenomena In Pulse Current Co 2 Arc Weldingmentioning

confidence: 99%

Development of low spatter CO₂ arc welding process with high frequency pulse current

Tokihiko¹,

Rinsei²,

Yasuda³

et al. 2009

Science and Technology of Welding and Joining

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Metal transfer phenomena and spatter generation in CO 2 arc welding with a solid wire were investigated, and a low spatter welding process using a high frequency pulse rectangular current was developed. The optimal conditions of high frequency pulse CO 2 arc welding were determined to be a peak current of 450-550 A and pulse frequency of 450-750 Hz. These high frequency pulse currents influenced the droplet oscillation due to resonance between the applied pulse frequency and the natural frequency of the droplet. A droplet was regularly transferred by 9-11 pulses, and the average interval of metal transfer was y16 ms, which was half of that in conventional CO 2 arc welding. The average droplet weight is 34 mg, showing a large reduction in comparison with that of the conventional method. As a result, the total spatter weight was reduced by 70% in comparison with the conventional method, and particularly large spatters more than 0?5 mm in diameter were reduced from 25 to 3 mg s 21 .

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“…At this pulse frequency of 50 Hz, it was observed that the pulse current and droplet transfer were synchronized and one droplet was transferred per pulse. It was observed that for the one-droplet one-pulse transfer in MAG (Ar -20%CO 2 ) and MIG pulse welding, during the peak current period, the droplets grew with the formation of necks, and during the base current period, they became separated from the wire tip transferring to the molten pool 11,12 . By contrast, droplet transfer during one-pulse, one-drop transfer in CO 2 pulsed welding, was observed for 2-6 ms in the first half of the peak current duration.…”

Section: The Droplet Transfer Phenomenon During Pulsed Co 2 Arc Weldingmentioning

confidence: 99%

Development of a low-spatter CO₂arc welding process with a high-frequency pulse current

Kataoka

Ikeda

Yasuda

et al. 2009

Welding International

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In CO 2 arc welding of solid wire, metal transfer phenomena and spatter generation are investigated with rectangular pulse current, and a low spatter CO 2 arc welding process with high frequency pulse current is developed. The optimal conditions of high frequency pulse CO 2 arc welding are in the range of peak current: 450-550 A and pulse frequency: 450-750 Hz. These high frequency pulse currents have the effect of droplet oscillation due to resonance between applied pulse frequency and the natural frequency of the droplet. The droplet is transferred consistently every 9 -11 pulses and the average interval of metal transfer is about 16 ms which is reduced to half that of conventional CO 2 arc welding. This average droplet weight is 34 mg, showing a large reduction in comparison with that of the conventional method. As a result, total spatter weight is reduced by 70% in comparison with the conventional method, and especially, large spatters more than 0.5 mm in diameter are reduced from 1.5 to 0.2 g/min.

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Pulsed arc welding.

Cited by 21 publications

References 0 publications

Effect of parameters of welding circuit on formation of welding current pulses

Effect of parameters of welding circuit on formation of welding current pulses

Development of low spatter CO₂ arc welding process with high frequency pulse current

Development of a low-spatter CO₂arc welding process with a high-frequency pulse current

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Pulsed arc welding.

Cited by 21 publications

References 0 publications

Effect of parameters of welding circuit on formation of welding current pulses

Effect of parameters of welding circuit on formation of welding current pulses

Development of low spatter CO2 arc welding process with high frequency pulse current

Development of a low-spatter CO2arc welding process with a high-frequency pulse current

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Development of low spatter CO₂ arc welding process with high frequency pulse current

Development of a low-spatter CO₂arc welding process with a high-frequency pulse current