Submerged-arc welding process for high-crack-arrest-toughness steel with yield strength of 460 MPa

The invention discloses a submerged arc welding process for steel with yield strength of 460 MPa and high crack arrest toughness. Belongs to the technical field of steel smelting. The preparation method comprises the following steps: determining a welding base material and a welding material; and welding parameters are determined. When the welding process parameters are adopted for welding, the comprehensive mechanical property of a welding joint is excellent, the impact energy KV2 of a welding seam and a heat affected zone at the temperature of 40 DEG C below zero is larger than or equal to 53 J, the tensile strength Rm is larger than or equal to 570 MPa, the lateral bending d of the welding joint is 4a, no crack exists at the angle of 180 DEG C, and the NDTT of the welding joint is smaller than 40 DEG C. Reasonable submerged-arc welding materials and a submerged-arc welding process are adopted, and it is guaranteed that the tensile strength of a welded joint is larger than or equal to 570 MPa, the low-tempe