Jacketed pipe welding method capable of reducing weld reinforcement

The invention discloses a jacketed pipe welding method capable of reducing the surplus height of a weld joint. The jacketed pipe welding method comprises the following steps that firstly, a pipeline is cleaned; secondly, a groove is formed; thirdly, a pre-connection layer is arranged at a plain end; fourthly, the part, extending out of the inner wall side of the plain end, of the pre-connection layer in the third step is polished; and fifthly, the aligned end openings of the two sections of pipelines are connected in a welded mode. Under the action of the pre-connecting layer, the part, close to the inner wall, between the two plain ends is thickened, after the ports of the two sections of pipelines are aligned and the distance between the two sections of pipelines is aligned according to requirements, due to the arrangement of the pre-connecting layer, the distance between the plain ends close to the inner wall area is relatively reduced, and when welding is carried out, the welding efficiency is greatly imp