Since the materials used in the manufacture
of combustors are readily weldable, repairs are typically
based on welding cracks and missing material. However,
there are many applications where distortion may be an
issue, such as when surfaces need to be built up over a
large area, and in these instances, the LPM technique is
more suitable. The principal difference between the F
class combustors and earlier models is the increasing
complexity in geometry. For this reason, having appro-
priate gauging and tooling is increasingly important