Welding method for effectively inhibiting weld toe defects of medium-thickness plate annular weld joint

The invention discloses a welding method for effectively inhibiting weld toe defects of a medium-thickness plate annular weld joint, and belongs to the field of welding. The welding method specifically comprises the following steps of a) forming a groove; b) fixing; c) preheating; d) positioning welding; e) backing welding; f) filling and cover surface welding; g) slow cooling after welding; h) grinding after welding; and i) inspecting after welding. According to the welding method, the weld joint in each layer is welded in two times during welding in the step e) and the step f), arc startingand arc stopping are carried out at the end surfaces of the two ends of rectangular steel, four corners are avoided, and the occurrence of the weld toe defects of the medium-thickness plate annular weld joint is effectively inhibited. The welding method has the advantages that the process is simple, the operation is convenient, the practicability is high, and the high-strength welding of a medium-thickness plate annular s