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Straightening A Bent Blade.

Discussion in 'Working the Steel' started by Grahamm, Apr 8, 2017.

  1. Grahamm

    Grahamm Active Member

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    I gave my friend a couple of blades to heat treat and although he is a great machinist he can be a bit rammy. So when the blades didn't fit in, rather than reposition he just gave the door a little shove to close it.
    So I ended up with some blade-a-rangs.

    I tried to bend one back by hand and now I have a 2 part weld your own handle on kit so I'm not gonna do this one.

    Short of taking the torch to it and re-treating it, is there any other option?
    Thanks.
    [​IMG]
     
  2. John Noon

    John Noon Well-Known Member

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    I tried a piece of HSS with one side cut off and holes cross drilled with bolts to act as blade straighteners then put in the furnace for a temper cycle. Results were not that good in reality but I was only doing a 400F temper at the time.
    Not much help but it is supposed to work mind you I was dealing with AEB-L which loves to be in a curve of some sort.
     
  3. Grahamm

    Grahamm Active Member

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    Well, I can confidently say that this didn't work either.
    [​IMG]
     
  4. John Noon

    John Noon Well-Known Member

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    Right about now I would be welding on a stainless steel rod for a hidden tang handle
     
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  5. Icho-

    Icho- Staff Member

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    Been there. I turned mine into a folder.
     
  6. Grahamm

    Grahamm Active Member

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    A folding Santoku would be very interesting. Gonna try to weld a 4 inch piece of steel on and go wa handle if I can. I'm a horrible welder so maybe I will just stick the rod to the steel and glue the welding rod into the handle. I only have a little crappy 110 V arc welder. Keep watching. I have a good feeling how this is gonna end....
     
  7. John Noon

    John Noon Well-Known Member

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    preheat the blade to it's tempering temperature before welding allow to cool very slowly before repeating the heat treating. An normalizing or spheroidized annealing cycle would be beneficial before quenching again.
     
  8. Grahamm

    Grahamm Active Member

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    Well, I doubt it would pass your inspection but here's what I did.
    [​IMG]
    I wrapped the blade in wet towels and it tested 56 RC about an inch from the weld. I'm gonna leave it and not reharden since the blade wouldn't have gotten hotter. It's just gonna stay at my house anyway. Thanks.
     
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  9. John Noon

    John Noon Well-Known Member

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    Now that looks real nice
     
  10. Grahamm

    Grahamm Active Member

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    Thanks. I ended up doing it at my buddies shop since he has a much better welder than my silly little arc welder. I was given it and have actually never been able to get it to work. But it's also been 20 years since I did any arc welding either.
     
  11. Grahamm

    Grahamm Active Member

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    I forgot to mention that I also took the other one, the one bent in the photo above and took the torch to it, got it much straighter and then rewrapped in stainless wrap and retreated it. I will post a photo but it's more like a 1/8 warp now than a 1/2 inch. Not perfect but nothing I do is ever perfect. Everything I do is learning as I go so I'm happy with how it came out. The lesson was learned back at the original heat treat.
     
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  12. Rick Marchand

    Rick Marchand New Member

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    Next time try to straighten during the temper. Clamp it straight and throw it into a preheated oven @400 for an hour. Quench in water and see if it set.
     

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