On Sun, 20 Jul 2008 21:22:42 +0800, Stealth Pilot
wrote:

On Sat, 19 Jul 2008 11:08:36 -0400, Michael Horowitz
wrote:

I'm working with 4130.
I have a piece of tubing with a series of rust holes which do not
cover an area greater than 1/2 ", so it appears a welded patch repair
would be appropriate.
Reading 43.13,, Figure 4-36, it appears the patch tube will have to be
expanded in diameter in order to fit over the injured tube (can't slip
the patch over the injured tubefrom an end).
Will there be any problem if I heat the patch so I can open open it
and slip it over the injured tubing? - Mike

take a piece of flat 4130 of about the width needed for the job but a
little longer.
(think of toilet paper on the roll. width to match but longer)

tack weld one edge along the tube. it will hang out like b
now heat the flat sheet to red heat with an oxyacetylene torch and
while it is soft bend or gently hammer it down onto and around the
tube.when about half way through the bending trim to shape as
necessary. complete the bend then complete the edge weld all around
the piece.

I have a very neat repair on the auster done just this way.

Stealth Pilot

Thanks - Mike