burning bars?

[4runnin]

has anyone ever used one or seen one in person cutting before?

i use oxy fuel daily and these burning bars make a oxy torch look like a BIC lighter compared

i would think that they are proly only used for the BIGGER jobs and thats why i never seen them around before until i was stroling around the internet and came upon this movie.

http://www.weldingtheater.com/VideoN...1_uem.flv.html

ENJOY

have a good day

4runnin

[denrep]

I've used them. They are more controllable than they may seem.

Especially useful for extracting stuck pins, even smaller ones, such as 1.25 inch diameter.

[drivethruboy54]

ive never seen or used one but it kinda looks like oxygen lance cutting to me...

[Oldiron2]

Denrep: do you know how small the burning tubes are made, and what the internal wires are made of? I would guess some aluminum alloy, as that would produce much heat, but I suppose Magnesium might be added to some degree to get more heat without having too much Mag oxide which is too hard to keep molten.
Do they just look like a pipe stuffed with wire?
I think they work well for such things as bank vaults which are thick and made of steels which don't burn with oxy-acetylene easily, as stainless wouldn't. They also 'melt' concrete, I think.

[mrmikey]

We use one at work quite often allbeit a smaller version for removing king pins and similar, it's called an exothermic torch.
Ours comes in a suitcase size box with the hose, leads and ground clamp. In the video they use a torch to start it going we use a battery, once the rod starts burning it's kept going by the oxygen fed thru the wires.
As we were saying at work the other day, it can make you an a**hole or a hero as once it starts to burn there's not a whole lot of control over direction. If you start off crooked, that's the way you keep going. Another thing is if there's a bolt hole thru the pin it'll sometimes go off sideways and follow the hole.
It's a real bitch to not get burnt with it too as the best way to make sure you're straight is to stand directly behind it, which, oddly enough is where the melted material comes out :-).
As far as rod sizes, all I've ever used with ours is 1/4" and 3/8"....Mike

[David R]

I have them and the stinger that holds them. I used to just stick a hose on the end and hook it to my torches. It will burn a hole in anything.

1 box 25 3/8" rods.....$100.00 +

David

[denrep]

Originally Posted by Oldiron2

Denrep: do you know how small the burning tubes are made, and what the internal wires are made of?...

Oldiron2,

The smaller rods, about 1/4", look like they are made of rolled sheet. They may be just carbon steel.

I know that with a conventional torch, burning carbon steel, the spray can be redirected to further the torch's cutting range, by using the burning steel as fuel for extra cutting capacity. For example, when the cut is headed for more difficult cutting, such as a heavy or separate piece.

Some exothermic cutting pics in this old thread:
http://weldingweb.com/showthread.php...pin#post133630



Wait a minute.... Did you say bank vault?

Good Luck

[weldgault]

Originally Posted by Oldiron2

Denrep: do you know how small the burning tubes are made, and what the internal wires are made of? I would guess some aluminum alloy, as that would produce much heat, but I suppose Magnesium might be added to some degree to get more heat without having too much Mag oxide which is too hard to keep molten.
Do they just look like a pipe stuffed with wire?
I think they work well for such things as bank vaults which are thick and made of steels which don't burn with oxy-acetylene easily, as stainless wouldn't. They also 'melt' concrete, I think.

The internal bars are Magnesium and when lit, with Oxygen ( the correct VOLUME of Oxygen) comming from the back side,, will not go out. use a sawing motion and cut anything. John

[blackdoggy]

I have got one here, thats a nasty beast when it's lit and talk about sparks flying EVERYWHERE

[Burnit]

Ok, I really like Carbon-Arc. I love arcing stuff apart. But I had never seen this. Oh man. I NEED some of that stuff. That pin that was stuck in that shaft could have been a real head scratcher. That was cool!

[rookiewelder]

those things work very well stuck pins and such but look out if the pin has a grease hole in it

[DSW]

We use them for underwater cutting in the comercial dive industry. As said they will cut thru anything concrete, steel, bronze, you name it. The underwater rods look like a fiberglass antenna that are stuffed with tig rods.

[denrep]

Originally Posted by rookiewelder

those things work very well stuck pins and such but look out if the pin has a grease hole in it

Why?

Pin burning is such a miserable inferno of blowing molten slag and metal, that a little shower of hot grease can actually be a welcome relief.

[denrep]

I sent another stubborn one to pin happy-land this week.

Here's the pics:
Attachment 23651

Attachment 23652

Attachment 23653

Attachment 23654

Hey - Are the pics too large, or do they open too slow?

[59halfstep]

Denrep - Have you ever tried pre-heating the pin first with a rose bud then using the lance on the preheated pin? I had always tired it from a cold start and as I think about putting heat in the pin may work.

Charlie

[denrep]

Originally Posted by 59halfstep

Denrep - Have you ever tried pre-heating the pin first with a rose bud then using the lance on the preheated pin?...

Do you mean preheat the pin in an attempt to loosen the pin?
Or preheat to make the piecing easier, or faster?
Or are you thinking that preheat might reduce the inferno and volcano effect?

Once a pin is pierced there's usually no fight getting it out; due to a combination of heat and shrinkage and loss of the pin's center mass. With Slice rods, piercing from a cold start doesn't seem to be an issue either.

Before slice rods, I would sometimes heat a pin and then bury a torch into it with the oxygen blasting; this would often sacrifice the torch tip while burning the pin.

Good Luck

[59halfstep]

Originally Posted by denrep

Or are you thinking that preheat might reduce the inferno and volcano effect?

Once a pin is pierced there's usually no fight getting it out; due to a combination of heat and shrinkage and loss of the pin's center mass. With Slice rods, piercing from a cold start doesn't seem to be an issue either.

Before slice rods, I would sometimes heat a pin and then bury a torch into it with the oxygen blasting; this would often sacrifice the torch tip while burning the pin.

Good Luck

Yes preheat to reduce the volcano effect. Have you tried this? Are your slice rods the same as what I was always calling a lance? I would do well after I finally got to pierce the pin completely through.

[denrep]

Originally Posted by 59halfstep

Yes preheat to reduce the volcano effect. Have you tried this? Are your slice rods the same as what I was always calling a lance? I would do well after I finally got to pierce the pin completely through.

59halfstep,
No, I never tried the preheat, maybe I will next time.
Same principal as a lance, although these are a rolled tube of sheet rather than a tube full of wire.
Your right, once you break through the "volcano" subsides!

Seems like there is (or was) a manufacturer of the bars near you. I sort of remember hearing about a huge order they landed when the former Soviet defense equipment was being cut up.

Good Luck

[TozziWelding]

Arcair sells them as Slice rods.