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我厂石灰石矿FL460挖掘机,斗杆是其主要部件。由空心的斗杆体和斗杆头焊接而成。斗杆体外径 610 mm,内径为510 mm,壁厚为 50mm,斗杆长为10 220 mm,斗杆体长为1 000 mm.斗杆体材质为18MnMoNb锻件,斗杆头材质为ZG28GrMnMo。斗杆在挖掘机作业过程中与铲斗一起完成挖掘、载重、回转及卸载等作业。在使用过程中,斗杆发生开裂,开裂处为斗杆头与斗杆体之间的焊缝半圈,并向斗杆方向扩展,如图1所示。为保证生产的正常进行,决定对该工件进行修复。
I plant limestone mine FL460 excavator, stick is its main component. By the hollow body of the fighting rod and head welding. The outer diameter of the stick body is 610 mm, the inner diameter is 510 mm, the wall thickness is 50 mm, the length of the stick is 10 220 mm, and the length of the stick body is 1000 mm. The material of the stick body is 18MnMoNb forging, and the material of the stick head is ZG28GrMnMo. Stick in the excavator operation with the bucket to complete digging, loading, turning and unloading operations. During use, the stick cracks, crack at the head and the bucket body between the half-circle of the weld, and toward the stick direction, as shown in Figure 1. In order to ensure the normal production, decided to repair the workpiece.