Fracture tooth of gear shaft in well drilling pump was analysed by chemical analysis, mechanical testing metallographic examination macro and microfractography.
采用化学成分分析、力学性能测定、金相检验以及断口宏、微观分析等方法，对钻井泵齿轮轴断齿进行了分析。
The failure analysis consisted of a strength analysis, a macro-fracture surface analysis, a metallurgical microscope and scanning electron microscope analysis.
分析包括结构强度分析、宏观断口分析、金相分析和扫描电镜分析等。
The macro and micro analysis of fracture indicates that it produces fracture because it doesn′t avoid welding stress in time.
根据断口的宏、微观形貌，认为油管焊接后未及时消除焊接应力，产生了淬硬裂纹；
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