Effect of main arc voltage on arc behavior and droplet transfer in tri-arc twin wire welding

Cold metal transfer (CMT) is widely used in thin sheets welding, owing to its low heat input and freedom of spatter. An evolutionary technology, called CMT Adv, combines CMT and variable polarity (VP) process. Arc behavior analysis and droplet transfer analysis were performed by image capture system synchronized with current and voltage sensor. Checker calibration method was used to get dimensions of droplets. The results show that motion of filler wire, current and voltage waveform and droplet transfer of VP CMT (CMT Adv) are coordinated to maintain welding stability. And through precise energy control, droplets of same dimensions can be got in EP and EN period, which are similar to diameter of filler wire. To from droplets with same dimensions, lower power was supplied and melt efficiency is higher in EN period.

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Characteristics of Arc Voltage of High-Current Air Arc in Sealed Chamber

IEEJ Transactions on Power and Energy ◽

10.1541/ieejpes.132.740 ◽

2012 ◽

Vol 132 (8) ◽

pp. 740-746 ◽

Cited By ~ 1

Author(s):

Shinya Watanabe ◽

Kentaro Kokura ◽

Kyohei Minoda ◽

Shinji Sato

Keyword(s):

High Current ◽

Arc Voltage

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Arc voltage fluctuations in a nitrogen plasma torch

High Temperature Material Processes An International Quarterly of High-Technology Plasma Processes ◽

10.1615/hightempmatproc.v1.i2.30 ◽

1997 ◽

Vol 1 (2) ◽

pp. 179-190 ◽

Cited By ~ 2

Author(s):

V. Lago ◽

M. De Graaf ◽

Michel A. Dudeck

Keyword(s):

Plasma Torch ◽

Nitrogen Plasma ◽

Voltage Fluctuations ◽

Arc Voltage

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Characteristics of droplet transfer, molten pool formation, and weld bead formation of oscillating laser hot-wire tungsten inert gas hybrid welding

Journal of Laser Applications ◽

10.2351/7.0000189 ◽

2021 ◽

Vol 33 (1) ◽

pp. 012027

Author(s):

Chengyuan Ma ◽

Bo Chen ◽

Caiwang Tan ◽

Xiaoguo Song ◽

Jicai Feng

Keyword(s):

Molten Pool ◽

Weld Bead ◽

Inert Gas ◽

Hybrid Welding ◽

Hot Wire ◽

Droplet Transfer ◽

Bead Formation ◽

Weld Bead Formation ◽

Pool Formation

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Application of an Improved Mayr-Type Arc Model in Pyro-Breakers Utilized in Superconducting Fusion Facilities

Energies ◽

10.3390/en14144383 ◽

2021 ◽

Vol 14 (14) ◽

pp. 4383

Author(s):

Jun He ◽

Ke Wang ◽

Jiangang Li

Keyword(s):

Power Systems ◽

Computer Aided Design ◽

Circuit Breaker ◽

Black Box ◽

Driving Mechanism ◽

Change Rate ◽

Arc Model ◽

Arc Behavior ◽

Current Change ◽

Aided Design

Pyro-breaker, a fast-responding, highly reliable and explosive-driven circuit breaker, is utilized in several Quench Protection Systems (QPS). The commutation process and its parameters are the main technical considerations in the process of designing a new pyro-breaker. The commutation parameters, such as the commutation time and the current change rate, are not only determined by the electrical parameters of the commutation circuit but also the arc behavior during the operation. The arc behavior is greatly affected by the structure and the driving mechanism of the Commutation Section (CS) in the pyro-breaker. The arc model was developed decades ago and the black-box arc model is considered a valid method to study arc behavior. In this paper, the Schavemaker black-box arc model, an improved Mayr-type arc model, is applied to study the commutation process of a newly designed pyro-breaker. Unlike normal circuit breakers, the arc discussed in this paper is discharged in deionized water. A parameter selection method is proposed. The practicability of the method is verified by numerical calculation in Power Systems Computer Aided Design (PSCAD) and experimentally.

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Droplet transfer behavior of narrow gap laser wire filling welding

International Journal of Modern Physics B ◽

10.1142/s0217979219400459 ◽

2019 ◽

Vol 33 (01n03) ◽

pp. 1940045 ◽

Cited By ~ 1

Author(s):

Z. Zhang ◽

R. Wang ◽

G. Gou ◽

H. Chen ◽

W. Gao

Keyword(s):

Welding Speed ◽

High Speed ◽

Transition Period ◽

High Speed Photography ◽

Narrow Gap ◽

Droplet Transfer ◽

Transfer Behavior ◽

Feeding Speed ◽

Wire Feeding ◽

Droplet Transition

In this paper, we study the droplet transition behavior of narrow gap laser wire filling welding under the condition of changing welding speed and wire feeding speed, and it was observed by high-speed photography. It was found that with the increase of welding speed, the frequency of droplet transfer was reduced and the transition period was prolonged. With the increase of wire feeding speed, the wire was not fully melted and finally inserted into the molten pool.

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