But the matching impact bits often dropped off from the pneumatic hammers and led the well accident caused by complex factors.

但是，空气锤、特别是配套冲击钻头断脱导致的井下事故时有发生，影响因素极为复杂。

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The trenchless pneumatic hammers which don t rotate themselves during drilling include impact moles, pipe ramming hammers and pipe bursting hammers.

穿孔过程中自身不回转的非开挖气动锤包括冲击矛、夯管锤和爆管锤。

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Thanks to the failure analysis of the hammers made of two different kinds of materials, it is certain that the cleanness of materials plays a great impact on the high-temperature corrosion.

对两种材料锤头失效的分析，确定了材料的洁净程度对高温腐蚀影响。

youdao

Thanks to the failure analysis of the hammers made of two different kinds of materials, it is certain that the cleanness of materials plays a great impact on the high-temperature corrosion.

对两种材料锤头失效的分析，确定了材料的洁净程度对高温腐蚀影响。

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