Pipeline circumferential weld defect repairing method

The invention belongs to a metal pipeline welding repair technology, and particularly relates to a pipeline circumferential weld defect repairing method. The repairing method sequentially comprises the steps of electrode modification, oxidation color removal, pipeline surface cleaning, pipeline assembly, ring welding simulation, ring welding repair and welding effect inspection. In the circumferential welding process, a reasonable circumferential weld repairing process route and a reasonable circumferential weld repairing control process are explored according to welding objects and welding requirements, the qualification rate of pipeline circumferential welding can be greatly increased, and the method is particularly suitable for pipeline circumferential welds with the specification of (phi 6-phi 24)*0.8. Through electrode control, simulated girth welding before formal girth welding and accurate control over front face gas flow parameters, the problem that the one-time welding qualification rate of girth wel