| 摘要 |
<p>A method of replacing the tip portion of a turbine blade, comprising the steps of removing the tip portion of a turbine blade formed from chrome steel to leave an exposed surface and joining a replacement tip section formed from chrome steel and having a hardened portion to the exposed surface by welding, where the material in the weld is chrome steel and the temperature of the hardened portion does not exceed 260{C during the welding operation. The blade may be a high twist last stage blade for a steam turbine. The blade and replacement tip are preferably formed from 12 Cr steel, and are joined by a butt weld using TIG welding. The method is preferably carried out while the blade is still on the rotor. Also claimed is a turbine blade comprising a replacement tip section butt welded to the blade body.</p> |
