由于装载机机架结构复杂，加工难度大，因此机架的焊接工艺设计不仅要有效地控制工件的变形，而且还要解决一部分部件用装焊方法代替机械加工的问题。１　机架焊接结构及工艺性分析 机架由左右侧板组件、中间连板组件、底板组件、前进板、前横架和支承板等组成，如图１所示。（ Due to the complex structure of the loader rack and the difficulty of machining, the welding process design of the rack not only needs to effectively control the deformation of the workpiece, but also solves the problem that part of the components are replaced by the welding method. 1 rack welding structure and analysis of the chassis by the left and right side panel components, the middle plate assembly, the bottom plate assembly, the forward plate, the front horizontal frame and support plate and other components, shown in Figure 1. (