Method for repairing airfoil, and cooling collar

The invention relates to a method for repairing an airfoil (9) of an axial turbomachine in which material is deposited onto the airfoil (9) by means of deposition welding, and the airfoil (9) is cooled during the deposition welding. The invention further relates to a cooling collar (1) comprising at least one cooling channel (5) which has a coolant inlet (6) and a coolant outlet (7) and through which a coolant flows in the intended state. The cooling collar also comprises multiple cooling elements (8) which are arranged along an inner circumference of the cooling collar (1) and adjacently to the at least one cooling channel (5), said cooling elements resting against an object to be cooled, in particular an airfoil (9) to be cooled, in the intended state. 本发明涉及种用于维修轴流式涡轮机的叶片叶身(9)的方法，其中借助于堆焊将材料涂覆到叶片叶身(9)上，其中在堆焊期间冷却叶片叶身(9)。此外，本发明涉及种冷却套(1)，其具有：至少个冷却通道(5)，所述冷却通道具有冷却剂入口(6)和冷却剂出口(7)，并且在常规状态下由冷却剂穿流；和多个沿着冷却套(1)的内壁部且邻接于至少个冷却通道(5)设置的冷却元件(8)，所述冷却元件在常规状态下贴靠要冷却的对象，尤其贴靠要冷却的叶片叶身(9)。