聊城拖内配件厂的一台C41-400空气锤,因锤杆出现严重裂纹而停止使用。经检查在锤杆下部空心横截面出现严重裂纹,长达754mm,占锤杆周长的80％(图1),直线度大于0.5mm。经研究采用手工电弧焊进行修复,修复后直线度小于0.2mm。通过两年的使用证明,情况良好,现将补焊工艺介绍如下: Liaocheng drag within the Fittings Factory a C41-400 air hammer, hammer severe stop and use. Upon examination, a serious crack occurred in the hollow cross section of the lower part of the hammer rod up to 754 mm, accounting for 80% of the circumference of the hammer rod (Figure 1). The straightness was greater than 0.5 mm. The study used manual arc welding repair, straightness less than 0.2mm after repair. Through two years of use proved to be in good condition, the welding process is now introduced as follows: