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The friction weldabilities of DZ60 steel drill rod pipe and 40Cr steel drill rod joint for geological drill rod are explored.

地质钻杆用DZ60钢钻杆管体与40Cr钢钻杆接头焊接而成。

Drill pipes often work in abominable conditions under alternating stress and the friction collision between drill pipe and borehole wall, which puts drill pipes in the weakest component in the whole drilling equipment and tools, the crack propagation results in perforation or part often emerge.

钻杆常处于交变应力并且在与井壁摩擦碰撞的恶劣条件下工作，往往成为整个钻井设备与工具中最薄弱的环节，由裂纹发展致穿孔或完全断裂时有发生。

Model YTR150 rotary pile drill is another high performance rotary pile drill developed on the basis of model YTR230, featuring high torque, high maneuverability, low noise, low pollution, high operation efficiency and easy maintenance. The major specifications have reached those of foreign similar products. Model YTR150 rotary pile drill adopts hydraulic retractable crawler chassis made by Caterpillar. Its mast is lifted and lowered in full range with verticality automatically adjusted. Operating status parameters displayed by touch screen and monitor. Hydraulic pilot control is used for overall machine operations and load sensing hydraulic system and programmable logic controller are adopted to implement automation for easy and agile operation.

YTR150型旋挖钻机是在YTR230的基础上开发出来的又一种高性价比的旋挖钻机，具有大转矩、机动灵活、低污染、低噪声、施工效率高及维护方便等特点，主要性能参数达到国际同类产品水平YTR150型旋挖钻机采用了卡特彼勒生产的液压可伸缩式履带底盘，桅杆全程自动起落，自动调整桅杆垂直度，触摸屏和监控器可以直接显示工作状态的参数，整机操纵上采用液压先导控制，采用负荷传感液压系统和可编程控制实现自动化，使用方便灵活。

An important way is that the drill master sitting in the back cabin has the choice of piloting switching by one added button: In the default setting, the drill master has the right of control; the student like the back gunner on IL2 now can watch but can't pilot the plane. The panel data come from the drill master's computer and received by the student's computer, showed on his screen.

重要的一个方法是，坐在后舱的教官拥有驾驶权的切换选择权，可通过增加一个按键来控制，具体操作过程如下：默认情况下，教官拥有控制权，学员如同现在IL2的后座射击手一样，只能看而不能驾驶飞机，此时的仪表数据以教官电脑为准，学员电脑仅接受数据，并在本机上运算出仪表数据，并显示出来。

The ZOOMLION KSD25 Dry-Wet Horizontally directional Drill is the first drill which drills through hard rock without a bentonite and mud pump. Its pneumatic percussive technology has not only solved the problem of mud pollution, but also has increased its efficiency 40% higher than a normal drill. Additionally, its cost is also much lower, and therefore, it has been considered as a most efficient solution for complicated stratum (including pebble and gravel, backfill and rock).

中联KSD25干湿两用水平定向钻孔机是我国第一台不使用膨润土和泥浆马达就能在硬岩中钻进并导向的钻机，其国际领先的气动冲击钻机技术不但不存在泥浆污染的问题，而且效率比普通钻机提高40％以上，成本也要低廉得多，被公认为目前对付复杂地层（包括卵砾石、回填土和岩石地层）最为有效的方法。2 s# C J， k5 _% C

The HWDP's uses AISI 4145H alloy structural steel, the technique of production exactly carries on the SY/T5146-1997 standard, HWDP is one kind of medium weight and the drill pipe similar drilling tool, its wall thickness is thicker than the drill pipe, is thinner than the drill collar, on its thick wall body connected special and lengthen drilling joint.

整体加重钻杆的原材料用钢是AISI 4145H合金结构钢，生产工艺严格执行SY/T5146-1997标准，加重钻杆是一种中等重量和钻杆类似的钻具，其壁厚比钻杆大，比钻铤小，其厚壁管体上连接有特别加长的钻杆接头。

Combining traditional DTH hammer with pneumatic rock drill,by reference to the rotational mechanism of rock drill,studies the rotational mechanism of DTH hammer and introduces a new type of DTH hammer that uses backstroke energy of piston to drive drill to rotate.

将传统的潜孔锤与凿岩机相结合，研究了潜孔锤孔底回转机构，介绍了一种新型的潜孔锤。

Drill pipe,Drill bit, Drill collar,Pump Unit, Slurry pump and other petroleum machinery equipments that have been awarded API Certificate.

是VOLVO、三菱、威尔信和卡特等进口发电机及配件东营经销商，同时为各种设备维修提供先进的技术。

It is considered that fatigue crack is early produced on drill pipes, because the vibration load of drilling tools in air drilling is more severe than that in mud drilling. Fatigue cracks easily occur under alternating vibration. Because the current wellhead detecting instruments can not be used to reflect the change of pump pressure produced after drill pipe piercement timely and accurately, effective measures can not be taken in time to prevent the expansion of fatigue cracks. As a result, drill pipe fracture accidents occur.

失效分析表明，钻杆属于早期疲劳断裂，断裂主要原因是在空气钻井过程中钻具受到的震动载荷远大于钻井液钻井过程中的震动载荷，在交变的震动载荷作用下，钻具容易产生疲劳裂纹；由于现有的井口检测仪表不能精确及时反映钻杆刺穿之后产生的泵压变化，无法及时采取预防措施，疲劳裂纹不断扩展，最终导致了钻杆断裂失效。

It is considered that fatigue crack is early produced on drill pipes, because the vibration load of drilling tools in air drilling is more severe than in mud drilling. Fatigue cracks easily occur under alternating vibration. Because the current wellhead detecting instruments can not be used to reflect the change of pump pressure produced after drill pipe piercement timely and accurately, effective measures can not be taken in time to prevent the expansion of fatigue cracks. As a result, drill pipe fracture accidents occur.

失效分析表明，钻杆属于早期疲劳断裂，断裂主要原因是在空气钻井过程中钻具受到的震动载荷远大于钻井液钻井过程中的震动载荷，在交变的震动载荷作用下，钻具容易产生疲劳裂纹；由于现有的井口检测仪表不能精确及时反映钻杆刺穿之后产生的泵压变化，无法及时采取预防措施，疲劳裂纹不断扩展，最终导致了钻杆断裂失效。

For every one of my New Year resolutions, I have been a backslider for years.

说到我的新年决心，我每年都做

With empathy and focus on a feeling level, we can all relate to the common ground of mutuality of emotions.

有了同情心和感觉上一级的重点，我们都可以涉及到相互的情感共同点。