Lloyd Ellis Charpentier

US Patent:

20020054972, May 9, 2002

Filed:

Oct 10, 2001

Appl. No.:

09/974083

Inventors:

Lloyd Charpentier - Spring TX, US
Al Siegmund - Houston TX, US

International Classification:

B32B001/08
B65D001/00
F16K031/383
E21B007/00
F16K031/143

US Classification:

428/036910, 175/057000, 251/062000, 166/054500

Abstract:

The present invention describes a hardbanding material and a process for producing a hardbanding material which greatly extends the life of tool joints and sections of steel pipe to which the material is applied. Granules of tungsten carbide are dropped into a melt puddle which is formed when a low carbon chrome based alloy is welded to an outside surface of a drill pipe. The tungsten carbide has a size ranging from about {fraction (25/40)} to about {fraction (40/60)} mesh, with a hardness greater than 3000 HV. Alternatively, the tungsten carbide has a size of {fraction (40/60)} mesh with a hardness of greater than 1700 HV.