目前加厚钻桿的一般方法,是先将丝扣切除,再行镦厚。这样就需要在钻桿两端各切去100公厘左右。每年在这方面的消耗是很大的,目前有些单位已试验带丝扣的钻桿的镦厚方法,很成功。方法也并不复杂。与普通镦粗办法不同之点,是多加了一个冲心(这个冲心的外径比钻桿的丝扣内径略小一点)。在 At present, the general method of thickening the drill pipe is to cut off the thread first and then to upset the thickness. This will require drilling at both ends of each cut to about 100 mm. The annual consumption in this area is very large. At present, some units have successfully tested the method of upsetting the threaded drill pipe. The method is not complicated either. The difference with the ordinary upsetting method is to add a red heart (the red heart diameter than drill pipe thread diameter slightly smaller). in