Replacement of four fractured teeth
in a power generator Turbine Gear
Metalock repairs carried
out to the boss on large drive pulley from a stone crusher
Metalock is a method for the repair of machinery both iron and steel, which has
been fractured or cracked. The repair consists of peening into prepared apertures
at set centres, layers of METALOCK Keys.
These are specially formed keys made of special alloys. Each METALOCK
Key takes the form of a circular section joined key and a parallel
Slots are cut at
angles to the fracture
and METALOCK Keys are inlaid by cold working into the
parent metal. The alloys having a known tensile strength and the serrations of
a known shear strength, a precise amount of strength is restored as each key
is inserted. Holes are
next drilled along the line of fracture and these are tapped and filled with
This part of the work is known as METALACE and is carried out
with each one matching its predecessor.
In areas of great stress-concentration the MASTERLOCK is used.
This is a block of high tensile steel, usually rectangular in shape with its
edges serrated in the form of semi-circular holes. Like the Metalock Key, the
Masterlock is inserted into a prepared aperture and when in position, the surface
is generally flush with that of the parent metal. Semi-circular holes in the
parent metal match up with those in the masterlock and the resultant full holes
are filled with layers of short metal dowels which are peened into position.
Some of the advantages of the Metalock process are that it dampens and absorbs
compression stresses, provides a good expansion joint for such castings as cylinder
liners, diesel heads, or any vessel subject to thermal stresses, distributes
the tensional load away from fatigue points and relieves conditions of inherent
internal stresses where rupture has occurred. Hydraulic pressures of up to 10,000
Ibs P.S.I. are coped with by the Metalock process.