Welding groove structure for strip surfacing welding and composite steel pipe for strip surfacing welding

The utility model discloses a welding groove structure for strip surfacing welding and a composite steel pipe for strip surfacing welding, and relates to the technical field of oil and gas conveying composite pipe welding. The problems that in the longitudinal seam welding process of a composite pipe in the prior art, in the stainless steel composite layer welding process, the dilution problem, the welding seam corrosion problem, the welding seam strength problem and the like cannot meet the requirements of pipeline steel, and the welding efficiency and economical efficiency cannot be guaranteed are solved. According to the technical scheme, a welding groove is formed by combining a V-shaped groove and a V-shaped step groove, and the connecting part of the V-shaped groove and the V-shaped step groove is a truncated edge. The plate is machined, a welding groove is machined in one side wall of the plate, and the groove is a welding crevasse; and a welding groove I is also processed on the plate, is consistent w