水轮机转轮的检修(1)转轮汽蚀与裂纹的补焊首先拆出转轮,搬至检修场,重点检查叶片背面并记录其汽蚀位置、面积、深度。必要时对汽蚀区摄影拍照。对转轮叶片上、下根部应仔细检查有无裂纹。发现裂纹时,先在裂纹终止点用φ5一φ6毫米钻头钻孔,然后用电弧气刨或风铲将裂纹刨成V型坡口(不穿透性裂纹)或X型坡口(穿透性裂纹)。再选择适当品号的电焊条,在室温下 Turbine wheel repair (1) wheel cavitation and crack repair welding First remove the runner, moved to the maintenance field, focusing on the back of the blade and record the cavitation position, area, depth. If necessary, take pictures of cavitation area photography. On the runner blade, the root should be carefully examined for cracks. When a crack is found, a hole of φ5 to φ6 mm is drilled at the end of the crack, and then the crack is shaved into a V-groove (non-penetrating crack) or an X-groove (penetrability crack). Then select the appropriate number of electrodes, at room temperature