Abstract: A method and apparatus for repairing a casting in a cold metal repair process includes a plurality of drilling fixtures which facilitate the creation of one or more lock receiving recesses positioned generally transverse to the casting crack. The lock receiving recesses are formed of a single sized circular bore combination having alternating double and single circular portions to maximize strength. A plurality of correspondingly configured metal locks are inserted into the lock receiving recesses to provide transverse metal locks drawing the casting portions on each side of the crack together. A plurality of threaded bores are formed along the remainder of the casting crack in overlapping spacing which receive a corresponding plurality of stitching pins. The stitching pins each define threaded shaft portions having pointed ends and undersized major pitch diameter threads adjacent the pointed ends.

Abstract: A wall first portion of an article is provided with reduced tensile stress, of an amount less than that which can result in cracking of the wall, with an elongated opening through the wall first portion. The opening separates areas of a wall first portion and extends generally toward a wall second portion under a lower or different stress.

Abstract: A method for replacing cracked core spray supply piping in a boiling water reactor vessel includes removal of all or part of the core spray supply piping inside the reactor vessel and replacement of the piping with new piping components configured to couple with one another or any remaining core spray supply piping without being welded. In accordance with one aspect of the invention, a lower elbow of the core spray supply piping is removed and replaced with an elbow assembly configured to mechanically couple with an existing feed-through assembly at the core shroud, for example by use of friction fit, bias members, and/or bolts. A vertical section of the core spray supply piping feeding into the elbow can also be removed and replaced with a new piping section configured to mechanically couple with the replacement lower elbow assembly, for example using pins, clamps and sealing members such as piston rings.

Abstract: A process for repairing a defective opening in an automotive transmission housing includes the steps of (a) providing a drilling jig sized to fit closely within the servo bore chamber, the drilling jig having an alignment aperture concentric with the opening when fitted within the chamber, (b) inserting into the opening a bushing which closely fits within the opening, the bushing having a central reamer guide bore with a diameter larger than the original bore diameter, (c) inserting and rotating a reamer in the reamer guide bore thereby enlarging the diameter of the opening, (d) providing and inserting a repair bushing into the enlarged opening, the repair bushing having a central opening with a diameter equal to the original diameter and having an external diameter equal to the diameter of the enlarged reamed opening. An adhesive may be used to fix the repar bushing in the opening.