The invention discloses a low-temperature preheating high-strength flux-cored wire and a production process thereof, belongs to the technical field of
welding materials and can solve the problems that a high-strength plate high-temperature heating
welding process is complicated, long in cycle and high in cost, and product quality cannot be ensured by a production process in the prior art. The low-temperature preheating high-strength flux-cored wire comprises a steel tape sheath and
powder, the steel tape sheath is provided with an O-shaped section, and the
powder is placed in the steel tape sheath and comprises, in weight percentage, 0.03-0.042% of C, 0.47-0.49% of Si, 1.56-1.87% of Mn, 0.013-0.015% of P, 0.009-0.0092% of S, 1.18-1.52% of Ni, 0.12-0.25% of Cr, 0.298-0.37% of Mo, 0.003-0.004% of V and 0.013-0.014% of Cu. The balance is the steel tape sheath, a steel tape is longitudinally sheared, a
welding wire is pre-formed and secondarily formed, and the flux-cored wire is produced by a fine drawing process. The
welding process can be simplified, and the quality of the flux-cored wire can be improved.