Invention Grant
- Patent Title: Hardbanding method and apparatus
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Application No.: US14643807Application Date: 2015-03-10
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Publication No.: US10267101B2Publication Date: 2019-04-23
- Inventor: Robert F. Miller
- Applicant: Postle Industries, Inc.
- Applicant Address: US OH Cleveland
- Assignee: Postle Industries, Inc.
- Current Assignee: Postle Industries, Inc.
- Current Assignee Address: US OH Cleveland
- Agency: Fay Sharpe LLP
- Main IPC: E21B17/10
- IPC: E21B17/10 ; B23K9/04 ; B23K9/00

Abstract:
Various methods of hardbanding an apparatus are described. In one aspect of the invention an improved method of re-applying a hardbanding alloy to worn tool joints of a previously hardbanded drill pipe results in preservation of the metallurgical properties of the drill pipe and preservation of the internal polymer coating that lines the drill pipe. A method for applying hardbanding includes arc welding a consumable metal welding wire to a tool joint having a surface temperature that ranges from about 50° F. to about 170° F. and the arc welding power supply utilizes DC current. The method herein produces a hardbanded tool joint comprising a heat affected zone (HAZ) of a based metal having a Rockwell hardness of 40 Rc or less.
Public/Granted literature
- US20150252631A1 HARDBANDING METHOD AND APPARATUS Public/Granted day:2015-09-10
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