Over the past two decades many wide gap and modified
wide gap processes have been developed and employed in
the repair and manufacture of hot section gas turbine
components; GE’s Advanced diffusion healing ADH,
Snecma’s rechargement per brasage diffusion RBD, How-
met’s effective structural repair ESR, Chromalloy’s surface
reaction braze SRB, Turbofix, Sermafill, and Liburdi En-
gineering’s LPM. All of these processes involve the use
of high and low melting components to help limit the
amount of melting point depressant and to help bridge large
gaps. The patented LPM process is the only modified
wide gap process capable of filling large cavities resulting
from the removal of structural cracks or casting core holes.
In particular the LPM process has been used to rebuild
components that are missing large amounts of material
while maintaining very low levels of melting point de-
pressants. Additionally, the LPM process has been
extended to applying abrading and wear resistant materials
to change the surface properties of hot section components.