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Warped from heat

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Alan K

03-08-2001 04:40:43




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I've broke off a 5/16" bolt on an 3/16" x 14"x 30" non-skid floor plate out of an old army truck. Used propane torch to heat up around the bolt,which was about center of the plate. Bolt came out fine without to much heat, however there was enough heat to warp the plate metal about 1/8" My question is, " should I re-heat the area and hit with a hammer and try to shrink the metal or will more heat compound the problem"?

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Chuck

03-09-2001 05:07:39




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 Re: warped from heat in reply to Alan K, 03-08-2001 04:40:43  
Hi Alan, you said that this was a non skid floor plate. I remember working with these on Navy Subs if is the same material (aluminum impregnated with grit) This would be very difficult to heat to a color change point. Using a press brake and working on diagnals may be the best choice. Is it so warped that the bolts won't draw it down? Maybe a couple extra bolts would help. I don't know if this will help but good luck.

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Keith Ray

03-08-2001 17:10:25




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 Re: warped from heat in reply to Alan K, 03-08-2001 04:40:43  
Hi Alan, I agree with T-bone, You would have been much better off with an actelyne torch rather than propane. The key is how many btu's you can put into the damaged bold fast. A normal propane torch does not have the punch a cutting torch has. What you want to do is get a lot of heat into the damaged bold fast and not allow the heat to transfer to the piece that it is broken off in. As you found, you can warp your piece by applying slow heat. Another bad side effect is changing the temper of the piece that you are trying to save. I had someone ruin a perfectly good bushhog shaft by heating it with a propane torch to remove the stump jumper nut. They made it so hard that the threads and splines were so brittle that it could not be saved. If you cannot replace the plate that you warped, be very careful with the heat and cooling method. You may have to use a press and maybe a little hammer work also. Just take your time and don't do too much at a time and you should be ok. Good luck,
Keith

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T_Bone

03-08-2001 06:10:29




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 Re: warped from heat in reply to Alan K, 03-08-2001 04:40:43  
Hi Alan, If you hammer metal that is hot then it will expand causing more warpage because you are displacing metal on each hammer blow, making it thinner.

Reheat the piece to a dull red, then quench with a rag soaked with water. This may take several times to get the metal flat.

Now you have just seen the limitations of heating with propane. Had you used a oxy/act torch you would have a much narrow flame width and not distorted the surounding metal. I'm not a fan of propane for metal working.

T_Bone

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Al English

03-08-2001 08:06:38




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 Re: Re: warped from heat in reply to T_Bone, 03-08-2001 06:10:29  
Hi T_Bone, In addition to any shrinkage heating may have caused he may also have relieved stress that was imparted when the non-skid pattern was originally rolled into the material. Unless this piece happens to be really soft, I'm thinking it's going to be a real challenge to make it perfect...Al English



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T_Bone

03-09-2001 16:56:36




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 Re: Re: Re: warped from heat in reply to Al English, 03-08-2001 08:06:38  
Hi Al, yep I'm, sure there will stress but with a series of small heat/cooling spots it should flaten pretty well. He may have to start in a larger circle than originally and work it back towards the center. A real PITA sometimes.

T_Bone



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Alan K

03-09-2001 17:31:05




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 Re: Re: Re: Re: warped from heat in reply to T_Bone, 03-09-2001 16:56:36  
Chuck, the piece is steel plate and not so bad that I could just bolt it down, however thanks to the advice from T-Bone I plan to correct the problem and in future use my oxy/acetelyene torch not propane. Also in future, I will consider the shape of the piece for imparted stress as mentioned by Al English. - Just want to thank everyone for the help. Alan K.



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