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Unread 12-09-2009, 07:44 AM   #1
spk454
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How much heat to bend 3/16" mild steel?

Just bought a weld together bumper kit. It needs some tweaking. I have to weld the top seem, then bend the front and bottom sequentially without breaking the weld. Will a propane torch create enough heat to bend 3/16"? If not are they're other hand held torches that will creat enough heat? thanks.

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Unread 12-09-2009, 07:49 AM   #2
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Just read about benzomatic proplyene torches 3600F in air sounds hot enough...
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Unread 12-09-2009, 09:17 AM   #3
jason m
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You may not put enough heat into the plate with propane alone. You will probally need to mix it with Oxygen and then it will produce enough heat to bend them.

Why not just cut and re-weld the tabs you need to bend?

Jason.
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Unread 12-09-2009, 10:11 AM   #4
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usually propane torches won't get steel hot enough, you end up having to REALLY beat on it with a BFH, and use the whole bottle waiting for it to get hot enough....if you've got a BFH, 70+lb anvil or a very large farm vice its doable, but if all you've got is a hammer, you'll be at it forever. A propane forge will go hot enough, since its contained and the heat is much more concentrated with less atmospheric loss.

Oxygen-Acetylene torches burn at around 6000* F, which is the preferred method to heat steel for welding, cutting and bending purposes.
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Unread 12-09-2009, 11:03 AM   #5
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Go out and buy a bench vise. clamp it/weld it on your bench. Clamp the peice you need to bend. Use a pipe to bend it around little by little. each time you bend it a little, weld it up, repeat until done. Like in the pic if you can understand it. No heat required, just a little muscle.






Nevermind, I thought you had an XJ and had a different bumper
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Unread 12-09-2009, 11:07 AM   #6
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just found an oxygen/mapp torch kit at napa for 49$, flame temp of 5300F, that should do it no?
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Unread 12-09-2009, 11:26 AM   #7
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Quote:
Originally Posted by spk454 View Post
just found an oxygen/mapp torch kit at napa for 49$, flame temp of 5300F, that should do it no?

Those are the little bottles right? You'll go through oxygen like crazy. Those are good for small/pinpoint areas, and not much else. You don't know anyone with oxy-acetylene? If you are going to fab stuff for your Jeep, it would make things a lot easier. You'll be able to heat and bend that piece in 5 minutes with a pair of vice grips.
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Unread 12-09-2009, 12:23 PM   #8
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how about a kit with 20cu ft. tanks? big enough?
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Unread 12-09-2009, 06:46 PM   #9
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It depends on how many pieces you have, and the width of the bend. I made my own frame re-inforcement plates. The top and bottom plates I made were 1/4"thick X 2.5"wide. I had to heat an area 4" long to bright orange, and then I was able to bend them with vise grip clamps and very little exertion. It took me about 2-3 minutes per piece to heat them up. Also, I was only bending them 20-30 degrees. If you could post a pic or two I could give you a better idea. 20 cu ft is capable of generating the heat you need, but I'm not sure if it will be for long enough duration.
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Unread 12-09-2009, 08:00 PM   #10
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width is everything.
You can bend 3/16 all day long by hand depending on how wide it is. If your trying to bend say 2 separate approx 50inch wide pieces of 3/16 sequentially then your trying to make a tube like thing I believe..??

you will only be able to heat up (to a easily pliable material) a small area before you need more heat elsewhere over the total area. The small propane torches will not be worth a crap for that.

A good Oxy/cet torch with large tanks would do on metal that thin. You will still need a good method of bending that hot steel sequentially.

You could always use a good block of wood to bend thin steel to a certain degree. Especially if the wood already has desired angles already cut in it.

you can't bend first then weld??
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Unread 12-12-2009, 09:10 PM   #11
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Quote:
Originally Posted by jason m View Post

Why not just cut and re-weld the tabs you need to bend?

Jason.
i think this is a good idea then once u weld it grind and buff and no one will know its cut and welded unless u tell them lol
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Unread 12-12-2009, 10:44 PM   #12
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that of find a local auto shop they might charge you like $5 to do it if they are nice.
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Unread 12-18-2009, 03:42 PM   #13
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borrow a oxy/acet its around 6-8000 depending on how you mix
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Unread 12-18-2009, 03:52 PM   #14
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Go with oxy /acetylene and a big *** tip.
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Unread 12-20-2009, 08:00 PM   #15
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A rose bud tip on a oxy/acet will have no problems with bending whatever you want in a matter of seconds.
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