Welding method of titanium alloy narrow space welding seam with small curvature radius

The invention discloses a welding method of a titanium alloy narrow space welding seam with a small curvature radius. The welding method comprises the following steps: before assembling, carrying outacid pickling treatment on a welding seam area and an adjacent surface, and after drying, polishing a to-be-welded area; processing the shape of a filling material into the shape the same as the trackshape of a to-be-welded welding seam, then cleaning the filling material, then, placing the cleaned filling material on a component to-be-welded position, and tightly fitting the cleaned filling material with the to-be-welded area; adopting the cross positioning welding method to fix the prefabricated and formed welding seam filling material; before welding, coating a layer of active agent on a welding wire and on the periphery of a to-be-welded workpiece; and adopting the straight polarity direct current method to weld. The filling material pre-arranged method is adopted, so that the problems that the welding wire is