650MPa-level multi-wire submerged arc welding material suitable for 75kJ/cm heat input welding and welding method

The invention provides a 650MPa-level multi-wire submerged arc welding material suitable for 75kJ/cm heat input welding and a welding method, and belongs to the technical field of welding materials. The welding material provided by the invention comprises the following elements in percentage by mass: 0.08 to 0.12 percent of C, less than or equal to 0.09 percent of Si, 1.70 to 1.95 percent of Mn, 0.30 to 0.45 percent of Cr, 0.05 to 0.50 percent of Ni, 0.40 to 0.58 percent of Mo, 0.13 to 0.24 percent of Ti, 0.04 to 0.05 percent of V, 0.0005 to 0.0030 percent of B, less than or equal to 0.005 percent of Mg, less than or equal to 0.020 percent of Zr, less than or equal to 0.030 percent of La, less than or equal to 0.012 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.008 percent of Pb + Sn + As + Sb + Bi and the balance of Fe. 本发明提供了一种适用于75kJ/cm热输入焊接的650MPa级多丝埋弧焊用焊接材料及焊接方法，属于焊接材料技术领域。本发明提供的焊接材料包括以下质量百分比的元素：C：0.08～0.12％，Si≤0.09％，Mn：1.70～1.95％，Cr：0.30～0.45％，Ni：0.05～0.50％，Mo：0.40～0.58