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目前在六级以下的岩层中，大量的采用了硬质合金，使用过程中也显示出了许多其他磨料所不及的优点，钻进效率也更进一步的得到提高。如濉溪地质队出现了几台千米钻机也是与采用了硬质合金钻进有关的。但用硬质合金来钻进六级以上八级以下的岩层，就存在着一些困难，其中最主要的有两大弱点：一、合金容易崩刃；二、囘次进尺很低。这两弱点我认为与操作方法、合金质量、合金镶焊质量、合金镶焊的几何角度等因素有关。我仅谈谈负角钻头在硬岩层中钻进
At present, in six or less rock formations, a large amount of cemented carbide is used, and many other abrasive materials are not used in the process. The drilling efficiency is further improved. For example, there are a few kilometers of drilling rigs in the Gexi team that are related to the adoption of cemented carbide drilling. However, the use of cemented carbide to drill six or more rock below eight, there are some difficulties, the most important of which have two major weaknesses: First, the alloy easily collapsing; Second, back to the footage is very low. These two weaknesses I think with the operation method, the quality of the alloy, the quality of the alloy inlay, the geometry of the alloy inlay and other factors. I’ll only talk about negative angle bits drilling in hard rock formations