Some Characteristics of the Electrode Melting Phenomena in Narrow-gap MIG-arc Welding

概要

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Effect of groove width on wire melting rates and characteristics of welding arcs have been studied in DCSP and DCRPMIG arc welding (shielding gas composition ; 80%Ar+20%CO_2). In DCSP, it was found that wire melting rate increased as groove width increased, and wire melting rate became a constant value as groove width exceeded a certain boundary value. In cases where groove was narrow, welding arcs burned not only at groove bottom but also on both groove faces. Their arc flames were extended and wire tapered end had a tendency to be lengthened and sharpened. At the same time droplets became small and transferred smoothly (spray transfer). On the other hand, in DCRP, characteristics of arc and wire melting rates were not affected by groove width. The results are explained in terms of a change in magnetic force and wandering area of cathode spot around the conical tapered wire end.
社団法人溶接学会の論文
1980-04-01