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前言在水力发电装置中,水轮机的过流部件都要受到不同程度的泥沙磨损和汽蚀破坏,尤其在多泥沙水流中,迷宫环带的磨蚀程度是决定机组大修与否的关键因素。由于磨蚀所引起的破坏只在过流部件某些能够预测的特定位置上发生,所以寻求耐磨蚀的特殊钢材制造整个部件,或探索新的整体强化方法,不仅工艺十分复杂,而且成本大大增加。因此在这些特定位置表面上,进行局部强化处理,就会带来巨大的经济效益。目前国内外对水轮机迷宫环带的修理和强化,大都采用镶圈
Preface In hydroelectric installations, the overcurrent components of turbines are subject to different degrees of sediment erosion and cavitation damage. Especially in multi-sediment flows, the abrasion of the labyrinthine ring is the key factor that determines the overhaul of the unit. Since the damage caused by the abrasion only occurs at certain positions where the flow-through part can be predicted, it is not only complicated to process but also costly to find the whole part with special steel that is resistant to abrasion or to explore a new overall strengthening method . Therefore, in these specific locations on the surface, the local strengthening treatment, it will bring huge economic benefits. Currently at home and abroad on the repair and strengthening of the labyrinth of the hydraulic turbines, mostly inlaid ring