Abstract: Described is the process of manufacturing SAWH pipes with X100 pipeline-service steel strip;studied are the influences by the mechanical properties of the steel strip and different welding material formulas on strength,toughness and hardness of the welding joint.Accordingly,relevant suggestions are proposed,including maintaining the excess weld metal(reinforcement) of the SAWH pipe,optimizing the alloy elements,enhancing the strip laminar cooling velocity and reducing welding heat input,using round bar-shaped specimen for pipe body transversal tensile test and establishing specification for the X100 steel strip and the X100 SAWH pipe.