目前φ100毫米潜孔钻钎头主要采用40Cr或45钢锻造而成,不仅消耗大量钢材而且使用寿命不高,一般平均寿命仅为20米左右。为解决寿命问题,我们先后进行了精密铸造和电渣熔铸钎头的研制,取得了可喜的成果。经过井下凿岩对比试验,在钻机、岩石情况基本相同的情况下,电渣熔铸的钎头使用寿命显著地超过锻造和精密 At present, φ100 mm DTH drill bits are mainly forged from 40Cr or 45 steel, which consumes not only a large amount of steel but also low service life, and the average life expectancy is only about 20 meters. In order to solve the problem of life, we have carried out the precision casting and electroslag casting brazing head development, and achieved gratifying results. After downhole drilling contrast test, in the case of drilling rigs and rocks are basically the same, the service life of the electroless slag brazing filler metal significantly exceeds the forging and precision