Welded Patch Repair question

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

You should use the next diameter of tube to get easy conformation the the shape of the tube you are repairing. But, if you have no choice but  to use a patch from the same diameter tube, there is no problem with heating the patch to make it plastic enough to conform to the outside contour of the tube being repaired. If it doesn't lay down smoothly you can tack welt the patch where it makes contact with the tube, then heat the patch with the torch and gently tap it into place, till it lies down tightly with the tube, with a small hammer. You can tap and tack as you go until the patch is a tight fit, the weld it.

If you want to make a slip over repair using a whole piece of tube, you will have to use the next diameter tube as it would be virtually impossible to expand the diameter of a tube uniformly and continuously around its circumference.

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

Bruce - can't open it. Recommendation? - MIke




On Sat, 19 Jul 2008 19:14:38 GMT, "Bruce A. Frank"
wrote:



Nevermind; got it - Mike\


On Sat, 19 Jul 2008 17:58:18 -0400, Michael Horowitz
wrote:



Bruce - can't open it. Recommendation? - MIke




On Sat, 19 Jul 2008 19:14:38 GMT, "Bruce A. Frank"
wrote:



Nevermind; got it - Mike\


On Sat, 19 Jul 2008 17:58:18 -0400, Michael Horowitz
wrote:



Bruce - can't open it. Recommendation? - MIke




On Sat, 19 Jul 2008 19:14:38 GMT, "Bruce A. Frank"
wrote:



You should use the next diameter of tube to get easy conformation the the shape of the tube you are repairing. But, if you have no choice but  to use a patch from
the same diameter tube, there is no problem with heating the patch to make it plastic enough to conform to the outside contour of the tube being repaired. If it
doesn't lay down smoothly you can tack welt the patch where it makes contact with the tube, then heat the patch with the torch and gently tap it into place, till it lies
down tightly with the tube, with a small hammer. You can tap and tack as you go until the patch is a tight fit, the weld it.

If you want to make a slip over repair using a whole piece of tube, you will have to use the next diameter tube as it would be virtually impossible to expand the
diameter of a tube uniformly and continuously around its circumference.
 

Michael Horowitz wrote: Bruce - can't open it. Recommendation? - MIke

On Sat, 19 Jul 2008 19:14:38 GMT, "Bruce A. Frank"
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

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

Nevermind; got it - Mike\


On Sat, 19 Jul 2008 17:58:18 -0400, Michael Horowitz
wrote:



Bruce - can't open it. Recommendation? - MIke




On Sat, 19 Jul 2008 19:14:38 GMT, "Bruce A. Frank"
wrote:



On Jul 20, 9:22*am, 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

Stealth - so you placed a rectangle patch over the injury as opposed
to a diamond shape, or is that what you ment when you said "trim to
shape"? - Mike