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针对我国目前露天矿主要采掘设备ＷＫ-４Ｂ型矿用挖掘机的高强度变截面斗杆在变截面处发生裂纹或断裂失效问题，从结构和工艺两方面对其固有和产生的应力集中及残余应力问题进行了分析、探讨，并在新斗杆的设计和制造中刻意加以消除和改善，使新斗杆在吸收原斗杆的优点基础后其结构和工艺更趋于合理，提高了使用寿命。
In view of the fact that the high-strength variable-section stick of WK-4B mining excavator, which is the main mining equipment of opencast mine, has the problem of crack or fracture failure at the variable section, its inherent and stress concentration and residual Stress problems were analyzed and discussed, and in the new club designed and manufactured to deliberately be eliminated and improved so that the new club in the absorption of the advantages of the original base after its structure and technology tends to be more reasonable and improve the service life .