All-position automatic welding method for laser-induced arc flexible heat source with circular ring structure

The invention provides a laser-induced arc flexible heat source all-position automatic welding method for a circular ring structure, which comprises the following steps: assembling a to-be-welded circular ring component, so that the butt joint gap and misalignment size of the to-be-welded circular ring component are within a reasonable range; a water-cooling copper liner with a forming groove is laid on the back face of the to-be-welded part, and meanwhile it is ensured that a welding seam is aligned with the center line of the forming groove; a water inlet and a water outlet of the copper liner are connected with a water pipe; a laser-induced arc flexible welding heat source is adopted, and proper welding parameters are selected for welding according to the position of the circular ring; and removing the copper liner after welding. The bottleneck problem that the back face of the welding seam is prone to having the inward concave defect during continuous welding from the neutral welding position to the overh