Straight polarity mag-welding wire and straight polarity mag-welding method using same

Abstract

Provided is a straight polarity MAG-welding technology capable of not only reducing spatter generation, but also achieving an excellent bead shape when preforming MAG welding. The technology involves a welding wire for use in straight polarity MAG welding; this welding wire has a composition containing: in mass %, C: 0.020 to 0.080%, Si: 0.50 to 0.97%, Mn: 1.50 to 2.00%, P: 0.001 to 0.050%, S: 0.001 to 0.025%, Ti: 0.10 to 0.30%, Al: 0.010 to 0.050%, Cr: 0.05 to 0.20%, Ni: 0.01 to 0.10%, Mo: 0.05 to 0.30%, Ca: 0.0016% or less, REM: 0.020 to 0.055%, B: 0.0005 to 0.0030%, N: 0.0100% or less, and a balance consisting of Fe and inevitable impurities. If necessary, the composition may further contain at least one selected from, in mass %, Nb: 0.050% or less, V: 0.050% or less, Zr: 0.300% or less, and K: 0.0150% or less.

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