Welded Tool Joints November 1, 2002 Grade E (oilfield quality) DOM (drawn over mandrill) tubing by Talik Industrial Services Inc. is consistently round with no seams. The inertia-welded tool joints are tempered alloy with a hardened skin to increase thread life. Share This Story You must login or register in order to post a comment. Report Abusive Comment Thank you for helping us to improve our forums. Is this comment offensive? Please tell us why.