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:



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:



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:



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:



I know you said you got it, but I figured out how to make some changes
in the program and wonder it it shows up now:
-------------
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 in message
...


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




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




No problem. Use the next size larger tubing. Run it through the bandsaw
lengthwise. Fix it over the damaged tube and weld everything back together.

Highflyer
Highflight Aviation Services
Pinckneyville Airport ( PJY )

"Highflyer" wrote

No problem. Use the next size larger tubing. Run it through the bandsaw
lengthwise. Fix it over the damaged tube and weld everything back
together.

How about cutting a taper (like points on opposite sides from each other) on
the new tube to avoid creating a stress riser that would occur where the new
tube suddenly stopped, all of the way around?
--
Jim in NC