Excavator arm: excavator indirect execution condition is an important component, directly determine the excavator and working conditions for all working parameters of efficiency, it must ensure sufficient arm strength, stiffness; our original size measurement by excavator design, improved after the production! Structural design using 2D AutoCAD, SolidWorks three-dimensional stress analysis, simulation conditions, CNC flame cutting through the automatic cutting, and then ambush using CO2 arc welding and welding welding, welding inside the box plus the buffer board, can increase the load arm when the strength, rigidity and prevent deformation of the stress release lead arm, or even scrapped, and then use automatic sandblasting, painting equipment to eliminate the welding stress, improve overall product quality, thereby greatly extending the life of the product.