Date:2015-12-04  12:27

A DTH drilling pipe is formed by the friction welding of a body and joints at both ends of the body. The quality of the DTH drilling pipe mainly lies on the material of the body and the joints, the welding quality in welding areas and the heat treatment to the welding areas.
Cr-Ni-Mo is always used as the material of the body and the joints of a high air pressure DTH drilling pipe. The body of the DTH drilling pipe is always manufactured by cold-drawing seamless pipes, and the joints are always formed by die-forging and machined after nondestructive test. The body and the joints are welded through friction welding with high welding quality and high efficiency.