Tool joints and drill pipe are bonded utilizing inertia welding. These machines guarantee the most consistent and reliable weld available. All inner and outer weld rings are removed from the pipe, and then the weld zone of the drill pipe is quenched and tempered to achieve its proper physicals as required by industry standard Spec 7 SR1. After the welding process is complete, each piece of drill pipe is examined in a wet magnetic particle testing unit and ultrasonic tested by independent third party level 2 inspectors. Welds are also inspected for correct hardness (less than 37 H.R.C) and thickness. At this stage one last quality check is utilized to verify any visual defects. Once drill pipe passes these tests it is stamped to industry standard requirements and ready for finishing.