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我单位的QT16型塔式起重机使用9年后，在施工过程中突然出现塔身不能回转的故障，解体检修减速机时发现减速机第二级摆线针轮上有多处裂纹、磨损和掉块情况（见图1）。因无现货备件，决定采用焊补法修复。1．可焊性分析摆线针轮材质为GCr15，其含碳量高，淬硬倾向大，易出现裂
My unit QT16-type tower crane 9 years after the sudden emergence of the tower can not turn the fault during the dismantling of maintenance reducer found cycloid pin wheel second gear reducer, wear and tear Block situation (see Figure 1). Because no stock spare parts, decided to use welding repair method. 1. Solderability Analysis Cycloid wheel material GCr15, its high carbon content, hardened tend to large, prone to cracking