GB764621A - Improvements in or relating to the repairing of fractured metal articles - Google Patents

Abstract

764,621. Jointing; soldering; welding by fusion. SVENSKA METALOCK AKTIEBOLAG. Dec. 6, 1954 [Dec: 7, 1953], No. 35303/54. Class 83 (4). A cracked or fractured metal article such, for example, as a casting is repaired by forming in the surface of the article a recess extending across the crack or fracture 1, inserting into the recess a locking plate 4 of such size as to form a continuous channel 5 between the sides of the recess and the plate, and introducing into the channel a suitable filler material 6 by a welding, soldering or pressing operation, the shape of the plate and recess being such that the plate 4 acts as a key to oppose separation, under tensile loading, of the portions 2 and 3 of the article on opposite sides of the crack or fracture. The plate is formed with arcuate end portions 7, 8 merging tangentially into side portions 9, 10 decreasing uniformly in width to a waist portion at the crack or fracture and the recess is of similar configuration to the plate so that the channel 5 is of uniform cross-section throughout. The plate is preferably of nickel alloy steel and it and/or the recess may be provided with grooves or undercuts such as 14 or 15 respectively. The filler material 6 may be welding material, soldering material such as bronze, or plastic material such as lead-bronze; the material in all cases being preferably subjected to subsequent cold-working by hammering or caulking. If the crack or fracture is located in a curved portion of the article, the recess is formed in the convex surface and the locking plate is curved accordingly.