Re: Powder spray torch ?

Posted by george md on July 13, 2004 at 10:17:24 from (4.155.3.224):

In Reply to: Powder spray torch ? posted by chuck grandgent on July 13, 2004 at 04:46:36:

Chuck,
Metal spray comes in basic types, hot spray (
usually called powder spray ) requires the base
material be quite hot much like brazing and the
spray material will (wet) flow somewhat like
brazing . The other system , cold spray requires
base metal to be minimum 200 deg and not over
500 deg , work is under cut and sprayed to slightly
over size and turned to finish size. It is used
mostly for shaft and bearing bore repair.
The hot spray will do repair on castings and
manifolds , but a crack in the side of a block
will have the same problem with expansion and
contraction as any other type of weld .
I have had both types of spray for more than
30 years and when I need to repair castings and
especially manifolds I use oxy/acet cast iron
rod and preheat as necessary .
Below is a link to my web site with some cast
iron repair and some other things , also a link
from there to a sequence of the repairs . In the
terra axle repair there are several pictures of
the prep , spray , and the finished spray on the
seal surface.

george

• cast repair and metal spray

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