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我矿4m~3挖掘机从1977年投产后,已使用13年,多年来动臂推压大轴轴承座与动臂焊接部位常有开焊或断裂(图1中粗线表示处)。或者是鞍座后面推压二轴下面与动臂结合的横断面开焊,引起动臂两侧面断裂,严重时导致动臂折断,而横端面的开焊,操作和修理人员又很难发现,即使发现了,在挖掘机作业面修复也十分困难。这样,一是等事故扩大后再处理,给维修人员增加了大量的修理工作量。二是在挖掘机
I mine 4m ~ 3 excavator put into operation in 1977, has been used for 13 years, over the years to boom the big bearing and boom welding parts often open welding or fracture (thick line in Figure 1 said). Or saddles behind the two-axis pressure with the boom below the combination of cross-open welding, causing the boom on both sides of the fracture, resulting in severe broken boom, and transverse end of the open welding, operation and repair personnel and difficult to find, Even if found, the excavator operating surface repair is very difficult. In this way, one is to wait for the accident to expand and then deal with it, which adds a lot of repair work to maintenance personnel. Second, excavators