QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Print ISSN : 0288-4771
Wear Mechanism in Contact Tube during MAG Welding
Hiroyuki ShimizuYasuyuki YokotaMasao MizunoTsuyoshi Kurokawa
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2005 Volume 23 Issue 2 Pages 220-229

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Abstract

Stable sliding contact is the most important factor for stable arc discharge of solid wire. If the contact tube wore seriously, arc discharge would become unstable and wire position would be shifted. Ordinary non-Cu-coated solid wire has much wear of contact tube about ten times comparing to Cu-coated solid wire. The mechanism of contact tube wear is not only friction at high temperature but also molten bridge formed between contact tube and wire surface. Some complex of superfine particles decreases the amount of contact tube wear. For example, the mixture of graphite and magnetite reduces the amount of contact tube wear by 80%. These particles form interface layer on inner surface of contact tube, and the layer prevents the transfer of molten Cu to wire surface. The interface layer mainly consists of FeO and complex oxides.

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© 2005 by JAPAN WELDING SOCIETY
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