Welding steel materials

This welding steel, PCTOD 0.065% or less, CeqH 0.225% or less, FB is 0.0003% or more, and the steel component Bp is 0.30% or less than 0.09% has, in the thickness center portion in the thickness direction cross section, the circle equivalent diameter 2μm or more oxide particles are 20 / mm @ 2 or less, and Ti oxides 0.05~0.5μm 1.0? 103-1 2.0? is 105 pieces / mm2.