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Method of metal transfer regulation during GMA welding

Published online by Cambridge University Press:  26 February 2010

V. A. Nemchinsky*
Affiliation:
Keiser University, 1500 N.W. 49th Street, Fort Lauderdale, FL, 33309, USA
D. W. Meyer
Affiliation:
ESAB Welding and Cutting Products, 801 Wilson Avenue, Hanover, PA, 17331-7948, USA
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Abstract

The main force that detaches a molten droplet from the electrode (wire) during arc welding is the interaction of the arc current with its own magnetic field. The magnitude of this force depends on the current distribution inside the droplet. A method to regulate the current distribution is proposed. The current redistribution is achieved by striking an additional arc with the droplet serving as a cathode of this arc. By the current redistribution it is possible (i) to decrease the threshold current of the globular to spray transition during GMA welding, (ii) to achieve this transition in different plasma gases, and (iii) to control the propelling direction of the detaching droplet. Some preliminary experiments confirm the proposed method.

Type
Research Article
Copyright
© EDP Sciences, 2010

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