Arc Characteristics and Metal Transfer with Flux-Cored Electrode in CO_2 Shielding (Report I) : Effect of Geometrical Shape in Wire Cross-section on Metal Transfer in Stainless Steel Wire(Welding Physics, Processes & Instruments)

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Metal transfer and arc characteristics of CO_2 welding with flux-cored wires which had various geometrical shapes were studied by using a high speed cine photographic technique and electrical measurements. Tow types of flux-cored wire in cross-sectional shape were used, that were wires with simple hollow-shaped metal sheath and those with fold-shaped metal sheath. The following conclusions were obtained. The difference in the averaged melting rate in the free flight transfer mode^4) among these wires was mainly depended on the difference in electrical resistance of the wires. In the case of hollow-shaped wires, the molten metal collected at the side of the wire tip and formed the large globule which was separated from the molten flux. The detaching of the molten metal was mainly due to the explosion at the wire tip. Moreover the molten flux was periodically dropped in the free flight transfer mode. In the case of the fold-shaped wires, the molten metal didn't form a globule at the wire tip and detached mainly in accompanying with the dropping of the slag.
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