Metal Stitching Repair Process


The Metalock repair consists of peening into prepared apertures layers of multi-dumbell shaped keys. These keys are manufactured from a special highly ductile alloy (MN211) specifically developed by Metalock’s own engineers and unobtainable outside the Metalock organisation.


A series of holes are drilled to pre-determined depths at intervals and at right angles to the fracture. The holes are then joined by the use of pneumatic chisels to take the exact female form of the Metalock keys. Metalock keys, size-matched to the holes, are inserted layer by layer and peened into a metal-to-metal condition into the apertures.


The high tensile strength of the keys ensures the return of a large percentage of the original lost strength. Holes are then drilled along the line of the fracture, tapped and filled with studs, each stud biting into its predecessor. This operation restores rigidity to the casting and ensures a pressure tight joint, essential for vessels subject to high steam or hydraulic pressures.


Hand grinders are used to finish off the repair prior to painting, and every repair is covered by the Metalock warranty.


Metalock is indeed a unique method of joining two pieces of metal together. It is recognised by Lloyd’s and all the leading classification societies and insurance companies as the ideal answer to metal fracture, and where a cold repair is desirable.


Before you consider scrapping, or an expensive replacement, think Metalock. 24/7 response to your engineering emergency


Advantages of Metalock process:


• Dampens and absorbs compression stresses • Provides a good ‘expansion joint’ for such castings


• Distributes the tension load away from fatigue points


• Maintains relieved conditions of inherent internal stresses where rupture occurred


• Maintains alignment and original surfaces, since lack of heat produces no distortion


• The vast majority of repairs can be done in situ, with consequent savings in time with little or no dismantling.


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