HARDBANDING METHOD AND APPARATUS

摘要

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.

主权项

1. A method of hardbanding a tool joint of a drill pipe, the method comprising:
arc welding a consumable metal welding wire onto a previously hardbanded tool joint, the tool joint having a surface temperature that ranges from about 50° F. to about 170° F.; and wherein the arc welding power supply utilizes direct (DC) current.