对高风压潜孔钻头使用时钻头体崩块、掉齿等早期失效情况进行分析，找到其失效原因。
The failure cause was found by analyzing high pneumatic down-the-hole bit bursting crack and the other reasons in the early stage.
对高风压潜孔钻头使用时钻头体崩块、掉齿等早期失效情况进行分析，找到其失效原因。
The failure cause was found by analyzing high pneumatic down-the-hole bit bursting crack and the other reasons in the early stage.
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