Laser welding thin wall bit is characterized by high welding strength of bit teeth, no falling out of the teeth and mass production by non water drydrilling.
激光焊接薄壁钻头的显著特点是钻齿焊接强度高，不掉齿，可以用于无水干钻，便于实现大批量规模化生产。
2
For bedrock drilling ordinary hard alloy driller can be adopted for vertical core-drilling with the addition of clear water during rotation. for overburden drydrilling process can be adopted.
基岩钻探方法以采取普通硬质合金清水回转垂直取心钻进，覆盖层采用干钻。
3
Meanwhile, in Kenya, which has long lorded it over its poorer neighbour, exploration firms keep drillingdry holes, to Ugandans’ delight.