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  1. A

    How to properly stress relief

    On the cracked mig weldments, some of them yes some of them no. When the cracks are in the HAZ the yes, when they come from the toe of the weld than no, thats due more to the shape of the weld fillet. I dont think 4130 is as forgiving as the designs are that people build. I honestly would hope...
  2. A

    How to properly stress relief

    Well Mike, I guess we will have to disagree then. I dont lump race stuff into aviation, totally different worlds there as far as fatigue is concerned. Yet Force did just about die due to improper 4130 weldment process. Yes it is rare to see a in flight failure, which is a good thing, id rather...
  3. A

    How to properly stress relief

    actually maule and aca use a combination of mig and tig including some tempered areas. bellenca built decathalons had issues with weld induced cracking causing wing seperation. those were un-tempered tig.
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    How to properly stress relief

    Hi Terry, Yes that is standard practice with OA...although not the few inches part, usually just the HAZ of the original weld and is done before the weld cools to avoid distortion. Its a different practice and reason than post heating tig welds.
  5. A

    How to properly stress relief

    Like I said, the tempering process is pretty forgiving. So Mike, you are a professional plumber right? You and the professional plumbing industry know things and have a consensus on how they should be done right? I bet you see people all the time scabbing things together at Menards that just...
  6. A

    How to properly stress relief

    Sorry for the confusion, I guess it is just how I speak. In my mind, considering the engineering information, industry experience, my own experience etc, I would not leave a critical 4130 tig weld un tempered. As for information there is a fantastic series of books that are considered the bible...
  7. A

    How to properly stress relief

    Hi, I think where some confusion comes in to play is what we are actually trying to accomplish with the post weld heating. Its been called a lot of things its not and that leads to a lot of fighting. Is it stress relieving? No, its not a long enough period. Is it Normalizing? No...same reason...
  8. A

    How to properly stress relief

    amature welder? Yeah Id say you are a bit tainted :) Tell you what, next time you come up to the Oshkosh area ill buy you a beer, and we can talk welding.
  9. A

    Crashes in the News - Thread

    We were told it would be soon, apparently they are waiting on some information from the Sonex bunch.
  10. A

    Oil tank

    Hi Paul!, Helpful tidbit when it comes to brazing. Give yourself maybe a 3-4x reducing flame and only use the outer envelope...never the heat off the inner cone. You need to sneak up on the heat, even the slightest bit too hot and it turns to a mess. I have found good luck using an...
  11. A

    Welding Question- Flux Wire Welding

    or oily..... Seriously.....Mig is just not suited for this application.....
  12. A

    Grinding 4130 tubing okay?

    I would say it depends on the location, how much material was removed and what aircraft. When in doubt be safe and install a split repair sleeve, of course after talking it over with the person that will be signing it off, as its really their call in any event.
  13. A

    How to properly stress relief

    Quite a few that I know actually. So I base my adherence to the practice of using a localized heat treatment on 4130 tig weldments due to the following; 1-4130 develops a microstructure of untempered martensite if the cooling rate is too fast immediately after solidification.....basic...
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    Oil tank

    Hi Paul, Thanks for the response! I too have been in those situations. When I saw the picture of the original tank It looked like the material bead around the neck was slightly darker than the rest of the base material, which to me indicates a high silicon content ( i.e. fillet brazing )...
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    Oil tank

    Nicely done! Why did you elect to tig the neck and outer seam instead of brazing the neck on and using OA? Just curious.
  16. A

    Grinding 4130 tubing okay?

    Certified?
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    stick welding?

    Hey Guys, Just thought I would help clarify some of the SMAW welding questions in reguards to stinson etc. Yes the 108 models are SMAW welded, as were the north american AT-6 tubular components, certain Bellenca fuselages, some aeronca components etc. Many times you would see a mix of welding...
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    Welding Question- Flux Wire Welding

    Simple answer....No Either O/A weld, or Tig with proper technique and post weld tempering.
  19. A

    How to properly stress relief

    Opinions are one thing, and should not be confused with engineering fact and metallurgy. The FAA now teaches A&P's to do it, and there are valid reasons why. If you want to have an educated discussion on the topic that is fine, however please keep opinions out of it.
  20. A

    TIG Welding 4130

    Sorry, meant to type .065, not .045, one of those days I guess. When I mentioned the range of gaps, I did not mean to imply that a .125” gap would be suitable for all joints. Nor did I mean to imply that a gap makes the welding easier, far from it in fact. What the gap does, is force you to have...
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