近年来,随着我国工业技术和工程建设的高速发展,各类起重机械被广泛应用于各个领域,由于各种原因,起重机械事故时有发生,而结构件(如起重臂、副臂、转台和车架等)的损坏尤为突出。是修复还是换新件是摆在用户和制造商间的一大矛盾,制造商从自身的角度当然不愿意进行修复,而换新件则由于费用昂贵用户难以接受,同时因为有的产品早已更新 In recent years, with the rapid development of China’s industrial technology and engineering construction, various types of hoisting machinery are widely used in various fields. Due to various reasons, accidents of hoisting machinery occur from time to time. Structural parts (such as jib, Arm, turntable and frame, etc.) is particularly prominent damage. Repair or replacement is placed in the user and manufacturer of a major contradiction, manufacturers from their own point of view, of course, do not want to be repaired, and the replacement parts due to expensive users difficult to accept because at the same time some products have been updated