History of the Method
The Metalock process was devised on the oil-fields in California (USA) in 1933. It was used to carry out operational repairs of constructions undergoing higher fire risk. In the 1940s Great Britain received a patent for the Metalock method. During World War II the Metalock method was used to carry out prompt repairs of marine engines.
The invention of the special alloy with high content of nickel marked the rapid development of the Metalock process since 1956. The Metalock keys made of the above mentioned alloy have excellent strength properties. The Metalock method is insertion of the Metalock keys in the holes drilled by the special Jigs across the line of fracture.
The multi-dumbell keys allow the damaged constructions to restore their primary form and hermiticity. The strength properties of the constructions are restored up to 90 – 95%. The Metalock method guarantees longstanding use of the restored constructions under severe conditions. It is known that the crystal lattice of the welded cast iron suffers from iternal stresses and consequent cracks in the welded areas.
The Metalock method doesn’t demand heating which can cause numerous changes and residual deformation of the repaired constructions. In most cases the Metalock process excludes the necessity to dismantle the damaged constructions. It is another advantage of the technology. The Metalock technology is successfully applied to repair and restore industrial equipment made of cast-iron, steel and non-ferrous metals: (pump casings, compressors, engines, gear boxes), foundation constructions of bridges, historical monuments of cultural heritage.
There is no doubt that in comparison with welding which causes a number of technological problems in the repair of cast-iron constructions the Metalock process is rather promising.