| 摘要 |
A method of repairing a worn surface of a work piece especially but not exclusively a fin surface (2) of a down hole stabiliser tool (1) basically comprising placing an array of hard wearing trapezoids (10) e.g. of tungsten on the surface to be repaired and occupying the space between the trapezoids (10) by a filling (11) 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 (12) and (b) an initial buffer layer (8) between the filling (11) 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 (10) 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. |
