Method for eliminating cracks of runner of water turbine

The invention relates to a method for eliminating turbine runner cracks, and belongs to the technical field of turbines. The method comprises the steps of blade water outlet edge end face shaping, replacement area cutting and replacement, size inspection and the like. According to the blade 3D model, the water outlet edge of the runner blade is integrally cut short and ground, the thickness of the water outlet edge is increased, and the anti-fatigue capacity is improved; metal materials in a heat affected zone are cut off at the connecting part of the water outlet edge of the runner blade and the lower ring; and high-quality forged steel with the same size as the cut-off area of the blade is welded to the stress concentration part, and fillet transition is conducted on the water outlet edge. The method solves the problem of cracks of the turbine runner, improves the health level of a water-turbine generator set, effectively guarantees the operation safety, stability and reliability of a power plant, and is ea