Flush Hard Facing of New Tool Joints

After tool joints are attached to drill pipes, the flush hardfacing procedure is done at strategic places around the world.

Recessing of Box and Shoulder kept cool to protect internal coating.

Standard procedures begin with buffing the surface to remove oxidation and rust-proofing compounds. The box OD and taped shoulder of each tool joint is then recessed to a precise depth. Constant cooling during this machining procedure assures that the internal plastic coating is not damaged.

Inert Gas Welding assures a uniform welded surface Before welding begins, each joint is pre-heated to aid the welding process and prevent heat checking in the hardface area. Then individual bands are applied by an oscillating welding electrode with constant wire feed. Inert gas is introduced at the welding head to assure a uniform weld, without tool joint distortion or damage to the internal coating. Atomic hydrogen welding is used to apply hard metal to the finger pads. Finally each joint is cooled in an insulated box to maintain the metallurgical integrity of the joint and the hardfacing material.

Recessing and Flush hardfacing of new tool joints is also available in pipe yards with Tuboscope's Mobile equipment.

Please contact Tuboscope , Indonesia for further information.