液压缸在工作过程中,常出现缸筒焊缝漏油故障。对于这一故障可采用焊接的方法进行修复。由于焊接时缸筒局部受热,焊接处冷却后受到较大的拉应力,从而发生变形,其后果是造成焊接处缸筒内径不圆度或焊缝出现裂纹。特别是缸口处油管接头的修焊所引起的缸筒内径的变形,将使活塞连同活塞杆无法从缸筒内抽出或装入。对于出现裂纹的焊口,如果反复进行焊补,将会导致焊接处缸筒材质的变化,使缸筒无法继续在高压条件下工作。为此,焊补缸筒时,对其焊接工艺应引起足够的重 In the working process of the hydraulic cylinder, the oil leakage of the cylinder tube welding seam often occurs. For this failure can be repaired by welding. Due to the local heating of the cylinder barrel during welding, the welding place is subjected to a large tensile stress after cooling, and deformation occurs. The consequence is that the inner diameter of the cylinder bore of the welding place is not round or the weld seam is cracked. In particular, the deformation of the inner diameter of the cylinder caused by the welding of the tubing joint at the cylinder port will make it impossible for the piston, together with the piston rod, to be withdrawn or loaded from the cylinder. For welds with cracks, repeated weld repairs will result in changes in the material of the cylinders at the welds, making the cylinders unable to continue working under high pressure conditions. For this reason, when welding cylinders, their welding process should cause enough weight.