The first pipes used in the drilling rig are Tij pipes. The simple task of the rods is to drill the borehole with drills attached to the ends. A few interconnecting pieces are added between the drill and the rods, and thick walled pipes are used to make the weight. The rods consist of three parts, the main pipe body with upset inwards or outwards, and tool heads mounted on both sides of the body. The rods are mounted to the body pipe by means of different methods (friction welding, screw and fill welded and tight fitting). Among these methods, according to international standards, the most accepted method is the Friction Welding developed in recent years.