| 摘要 |
PCT No. PCT/GB95/01211 Sec. 371 Date Sep. 4, 1998 Sec. 102(e) Date Sep. 4, 1998 PCT Filed May 26, 1995 PCT Pub. No. WO95/32831 PCT Pub. Date Dec. 7, 1995A method of repairing a worn surface of a work piece especially but not exclusively a fin surface of a down hole stabilizer tool basically comprising placing an array of hard wearing trapezoids e.g. of tungsten on the surface to be repaired and occupying the space between the trapezoids by a filling applied by a relatively low temperature fusion welding process, preferably using a MAG welding technique. The welding temperature, for example less than 250 DEG C., can be well below the tempering temperature of the treated material e.g. steel, and this avoids harmful effects to the steel material. The worn surface can be dressed as a preliminary if necessary before the repair treatment proper. Additional layers are possible in the form of (a) matrix and (b) an initial buffer layer between the filling and the treated surface, the latter (b) again being applied by low temperature fusion welding but the former (a) can be applied by brazing. It is beneficial for the trapezoids to be arranged inclined relative to an axial direction of the surface being repaired. The present repair method is usable both for magnetic and non-magnetic steels. |
