A drill pipe coupling device consists of a pin, a sleeve mounted on the pin, and two studs, a large stud and a small stud. The pin is provided with a transverse opening for the large stud, and the sleeve is provided with a transverse opening for the large stud, having a bevel for the raised countersunk head of said stud, on the other side of the sleeve. A through opening for securing the large stud by means of the small stud is provided in the wall of the sleeve, transverse to the opening for the large stud. The large stud has a raised countersunk head with a horizontal transverse groove formed thereon, and the other end of the large stud is provided with an opening for securing the stud by means of the small stud. The ends of the small stud are beveled. The small stud is configured for insertion into the opening in the wall of the sleeve and in the large stud. A pin and a sleeve are inserted into a pipe via a seat and are welded so that a drill pipe is formed which has a sleeve at one end and a pin at the other end.