Gas shield arc welding wire

A welding metal obtained by welding a welding base material using the welding wire, comprising by weight:

• 0.001 to 0.30% of C;
• 0.25% or less of Si (excluding 0%);
• 0.50 to 3.00% of Mn;
• 0.030% or less of P (excluding 0%);
• 0.030% of less of S (excluding 0%);
• 0.50% or less of Cr (excluding 0%);
• 0.60% or less of Mo (excluding 0%);
• less than 0.10% of Al (excluding 0%);
• 0.40% or less of Ni (excluding 0%);
• 0.50% or less of Cu (excluding 0%);
• less than 0.10% of Ti (excluding 0%), with a balance of Fe and other unavoidable impurities, the wire satisfying relational expression 1 and relational expression 2,
• wherein the welding metal has a length fraction occupied by pore defects of 10% or less (including 0%), with respect to the entire length of the welding metal, and
• 2.0≤[Si]×100/[Mn]≤5.2 [Relational expression 1]
• [Ti]+[Al]<0.10 [Relational expression 2]
• in Relational expression 1 and Relational expression 2 above, [Si], [Mn], [Ti], and [Al] represent a weight percent content of each element in parentheses for the welding wire.