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Cutting metal #8386934 09/16/21 03:55 PM
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tailchaser93 Offline OP
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I’m looking for something to cut through metal pipes that are around a half inch thick and full of concrete. Any ideas besides a cutting torch? Or is there a better tip for a cutting torch that would work? My boss said the torch didn’t get the metal hot enough and the small grinder worked but it took a long time and they went through a lot of wheels.

Re: Cutting metal [Re: tailchaser93] #8386936 09/16/21 03:57 PM
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The pipes are buried under a concrete pad and they need to be cut off flush with the pad.

Re: Cutting metal [Re: tailchaser93] #8386997 09/16/21 05:01 PM
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Had to remove some steel bollards filled with concrete at DFW Airport. 6 inch pipe. The best way was a grinder going slow and taking small cuts. After pipe removed still had to grind and chip the concrete flush.

Re: Cutting metal [Re: tailchaser93] #8387083 09/16/21 05:53 PM
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maybe if you can fit a band saw on them.

Re: Cutting metal [Re: tailchaser93] #8387111 09/16/21 06:20 PM
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If the torch won't do it, you're using a tip too small. Get a number 3 tip. You may have to bump up th Acetylene to 10 psi and the Oxy to 25 psi. The number 3 tip will get it done at the proper angle. You do not want to be trying to blow kerf into the interior concrete, it will just blow back into your tip. The tip needs to be tangent to the circle.

Portaban will also get these cut off. Let the blade cool about halfway. Nothing wrong with a bit of water on the blade.


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Re: Cutting metal [Re: tailchaser93] #8387193 09/16/21 07:33 PM
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If the cuts don’t have to be pretty, I’d recommend a decent sized air chisel because it will handle both metal and concrete.

Re: Cutting metal [Re: tailchaser93] #8387270 09/16/21 08:45 PM
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Using a torch, be sure and wear a face shield and long sleeves. The reason is if you get the concrete floor too hot it will explode due to expansion of heating a small area. It will scare the heck out of you when it happens and it hurts. The port-a-band looks like the best and safest way to me.

Re: Cutting metal [Re: tailchaser93] #8387295 09/16/21 09:01 PM
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If full of concrete, I can see how that could be a challenge. The concrete would soak heat like crazy making cutting with a torch difficult at best. I'd probably go after it with a grinder and cutoff wheel, then break off the concrete once the metal is severed.

Better yet tho, I'd call a concrete cutting contractor and hire the job out to them. They'll have a wet or diamond saw that would make short work of it. Even shorter since I wouldn't have to be doing it.


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Re: Cutting metal [Re: tailchaser93] #8390682 09/19/21 08:57 PM
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I’ve got a diamond cutoff wheel for a large 7 inch grinder, it will handle both the metal and concrete. You won’t burn through as many blades as you would with a fiber blade. With my grinder you’ll still have 1/2-3/4 inch sticking up.

I hate using a torch with concrete due to the concrete exploding, but it can be done as JG stated above.


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Re: Cutting metal [Re: tailchaser93] #8390866 09/19/21 11:57 PM
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Originally Posted by tailchaser93
I’m looking for something to cut through metal pipes that are around a half inch thick and full of concrete. Any ideas besides a cutting torch? Or is there a better tip for a cutting torch that would work? My boss said the torch didn’t get the metal hot enough and the small grinder worked but it took a long time and they went through a lot of wheels.

plasma cutter?

Re: Cutting metal [Re: tailchaser93] #8390881 09/20/21 12:16 AM
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DO like JG said, if you have a washing tip it would work even better. They are curved like a banana.

Re: Cutting metal [Re: tailchaser93] #8390931 09/20/21 01:01 AM
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Talk to you welding supply dealer. I would think they have a grinding wheel made for that purpose. Ask the guys on https://www.weldingweb.com/ . That is where I go to get welding/cutting type answers.

Last edited by Old Shakie; 09/20/21 01:03 AM.
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