Numerical simulation of metal transfer in pulsed-MIG welding

Pulsed currents of various shapes have been employed to control the metal transfer phenomena. In the present study, a simulation model including both the arc plasma and the metal transfer is constructed, and their behaviors in pulsed-MIG arc welding are numerically investigated. When the peak curren...

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Bibliographic Details
Published in:Welding in the world 2017-11, Vol.61 (6), p.1289-1296
Main Authors: Ogino, Y., Hirata, Y., Asai, S.
Format: Article
Language:English
Subjects:
Behavior
Chemistry and Materials Science
Computer simulation
Electrodes
Gas metal arc welding
Materials Science
Mathematical models
Metallic Materials
MIG welding
Plasma
Plasma arc welding
Plasmas (physics)
Pulse shape
Research Paper
Solid Mechanics
Surface tension
Theoretical and Applied Mechanics
Wire
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Summary:Pulsed currents of various shapes have been employed to control the metal transfer phenomena. In the present study, a simulation model including both the arc plasma and the metal transfer is constructed, and their behaviors in pulsed-MIG arc welding are numerically investigated. When the peak current is set to 450 A and the peak time is set to 1.5 ms, only a single droplet is transferred per pulse. The numerical model can indicate the metal transfer and arc plasma behavior depending on the pulse shape. The temperature of the arc plasma increases rapidly at the early phase of the peak time, and consequently, the temperature of the wire electrode increases. After that, a large amount of the metal vapor generates from the wire tip, and the arc temperature decreases. These behaviors are periodic and can be controlled through the pulse shape. In addition, the appropriate pulse frequency depends on the surface tension of the wire electrode. This result shows that balance of the surface tension and the electromagnetic force is important to determine the droplet behavior. Therefore, in controlling the welding process, it is important to consider the properties of both the welding power source and the welding material.
ISSN:0043-2288
1878-6669
DOI:10.1007/s40194-017-0492-3