The wire-line coring tool of HSQ serial has kept up the technical features of conventional placer drills and derived the advanced structure from steel cable fishing tool for inner barrel.
HSQ系列绳索取心钻具，既保持了现用砂钻钻进的工艺特点，又发挥了钢绳打捞内管技术的方便性。
Detailed analysis is made of the reasons why fissures, peeling-off, and tooth breaking exist in the build-up welding layer of cast WC for hardening material of steel-toothed gear drills.
在钢齿牙轮钻头强化材料中，详细地分析了铸造碳化钨堆焊层产生龟裂、脱落和断齿的原因。
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