本文介绍了铁路货车钩体出现裂纹的原因及检修必要性,浅析了铁路货车厂修时钩体裂纹检修方法,包括裂纹排查、裂纹消除、裂纹焊修、焊后处理和质量检验等工序;重点分析了裂纹焊修工艺过程,包括制备坡口、焊条选用及预处理、焊前预热、焊接规范、焊后热处理等工步;也对钩体裂纹检修过程中的常见问题提出了防控措施。 This article introduces the reasons for the cracks in the railway truck body and the necessity of overhauling, and analyzes the methods of overhauling the crack of the hook body in the railway truck factory, including the procedures of crack inspection, crack elimination, crack welding repair, post - weld treatment and quality inspection. The crack welding repair process is analyzed in detail, including preparation of groove, selection and pretreatment of welding rod, preheating before welding, welding standard and post-weld heat treatment. The common problems in crack maintenance of hook are also put forward. Measures.