经我们修复的ＱＹ２５型汽车起重机，其转台在修复前存在以下问题（见图１）：轴套２与立板的焊接处严重开裂、变形，导致吊臂左、右倾斜，伸缩受阻；两立板变形严重，与轴套２焊接处有多处裂纹、扭曲。 该机虽已修过两次，但均未拆下过吊臂，仅对轴套２外面进行焊接加固，结果 QY25 car crane repaired by us, the turntable in the repair before the existence of the following problems (see Figure 1): the sleeve 2 and the vertical welded plate Department of severe cracking, deformation, resulting in boom left and right tilt, telescopic blocked; two legislation Deformed plate serious, with the sleeve 2 welding many cracks, distortions. Although the aircraft has been repaired twice, but have not removed the boom, only the outer sleeve 2 welded reinforcement, the results