我单位一台QY25型汽车起重机，其转台立板出现如下问题(见图1)：轴套2与立板焊接处严重开裂、变形，导致吊臂左右倾斜，伸缩受阻；两立板变形严重，轴套2开裂处有多处裂纹，并产生扭曲。该机曾修理过两次，均未拆下吊臂，仅在轴套2外面进行焊接加固，结果均只使用月余，轴套2焊 I unit a QY25-type truck crane, turntable legislation appears the following problems (see Figure 1): 2 and the vertical plate flange welding serious cracking, deformation, resulting in tilt around the boom, telescopic blocked; serious deformation of the two vertical plates, There are multiple cracks in the sleeve 2 crack, and produce distortion. The machine has been repaired twice, have not removed the boom, only outside the sleeve 2 for welding reinforcement, the results are only used more than a month, the sleeve 2