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Heating and bending with a torch

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Leon

03-22-2000 07:08:34

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How likely do you think it is that one could straighten out the auger in this picture by heating with a torch? I tried with heating tip on my oxy-acetylene rig, as well as with a cutting tip. I ran out of oxygen, so I was unable to come to a conclusion.

I am just wondering if a big enough welding tip will allow me to get it molten enough to bend back straight? If not me, I wonder if a welding shop could do it?

I can buy a new auger for $160 or so, but this one is in good shape, except for the bend ;-)

Bent Auger

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Leon

03-23-2000 20:29:38

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

Thanks to everyone for the ideas. I think i'm going to go the route of cuttiing it off, and building it back up with sections of heavy guage tubing.

This is really making me anxious to get a welder! All I have is an oxy-acetylene at the moment.

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Truck

03-24-2000 16:42:02

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Re: Re: Heating and bending with a torch in reply to Leon, 03-23-2000 20:29:38

Boy, I wish my tractor had that much power.. After looking at your posted picture for a while it seems to me you might want to consider a new shaft entirely, reusing the old "screw" carefully removed with your cutting torch. It looks as if the bend goes down into the screw part of the auger. If that is the case you will need to remove at least a turn or two of the " screw" part to allow you to splice below the damage. It will be a a great project to learn on. GO heavy with the center tubing!

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Fred

03-23-2000 08:20:49

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

Leon, this is your lucky day. Yes your auger can be straightened. Go to inside of bend and saw or burn half way through or better. Then it will take a whole lot less heat to straighten it. After it is straight enough (roll on concrete to determine when it suits you) Then weld the gaps back shut. Are you grinning yet?

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Tom from Ontario

03-22-2000 19:10:01

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

I agree with the other gents. Cut it out and make a new section. With one torch, you can't get enough heat on it at once to bend it back evenly. If you are determined to use heat to straighten it, you going to either need one BIG forge or a monster rosebud tip on a lance. Whatever way you go, good luck and be careful. Tom

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bbott

03-22-2000 16:52:33

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

I'd go along with the idea about cutting out
the bend and welding a new section in...

Looks like the bend is confined to the very topmost section above the auger..

Got access to a lathe.. or maybe you can find tubing with a nice fit... but i'd ...

Cut it square and put a sleeve inside, drill some holes through the original tubing and plug
weld the new inside sleeve.....

Then slip a sleeve on the outside.. heck, will
be stronger than new.

Just my 2 cts.

bbott

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ErnieD

03-22-2000 16:11:39

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

For the truly adventuresome, get 50-100# of hard coal, a section of pipe and a shop vac blower.

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Steve U.S. Alloys

03-22-2000 14:28:02

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

Hi Leon,
Flame straightening is an art I don't know much about. I do know however that if you can't get enough heat out of your torch, you can use an ordinary carbon arc rod or gouging rod to heat the heck out of anything. On DC-, 150-200 amps, 1/2" or more arc length for the carbon and AC for the gouging electrode at 150 amps and 1/2" arc length. I hope that helps you out.
Steve

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What I would do....

03-22-2000 09:26:56

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

Putting it in a press, or heating it will only weaken the tube. Don't forget, the tube transmits an incredible amount of torsion. Put the auger in a saw, and cut out the bend. Find a thick walled tube of the same diameter and weld it in place. For added torsional and bending strength, put a solid bar inside, bevel the outer tubes and weld the crap out it. I've done it several times and it works great.

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Jeff Pack

03-22-2000 16:55:16

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Re: Re: Heating and bending with a torch in reply to What I would do...., 03-22-2000 09:26:56

above is the best advice of any of them...

Heating, bending, only removes hardening,
and induces stress fractures in the material.

Cut it out, and weld new stuff in, with solid bar welded behind it.

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one last resort....

03-24-2000 19:31:35

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Re: Re: Re: Heating and bending with a torch in reply to Jeff Pack, 03-22-2000 16:55:16

Get what they call a "rosebud" torch tip.It looks like a giant tip from hell.It puts out the b.t.u.s that you will need for this.We use them to heat the tie rods on 200-350 ton presses.The tie rods are 3" and 4" in diameter.The tie rods get cherry red in a short time.(Be sure you have large tanks:they burn a lot of fuel/oxy.)Make sure you have flash arresters on your tanks,because these "rosebuds" have a tendency to want to flash back(because the "openings" are so large.If you let it cool slowly your temper will be fine(it is probably made out of mild steel any way).Good luck,and be careful. P.S.... The sound that these "rosebuds" make will cause you to be careful too,(extremely loud).

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ADfm(AR) reverse

03-22-2000 07:44:12

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

Did we move while still in the hole?? Either take it to a hydraulic press or be brave and drop it back in the hole and move in direction to reverse the bend. I would take the auger off and find some one with a hydraulic press and see if it couldn't be straightened that way. More likely to get it back close enough to use that way. AD

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rossow (mn)

03-22-2000 07:43:20

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Re: Heating and bending with a torch in reply to Leon, 03-22-2000 07:08:34

With enough oxygen and acetylene, you can heat up anything, but it looks like a challenging job to get it hot enough to bend back into perfect alignment before it cools off. An alternative might be to find a shop with a big (e.g. 40-ton) hydraulic press. It shouldn't be too hard to rig up some way to support it in a press and then gently press out the bend. I think you'd end up with a straighter shaft than by trying to heat it, and certainly at less cost than a complete replacement auger. Good luck with the job.

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