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I Forge Iron

Heat problem.


John Martin

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I've started using hardwood charcoal. I don't like the fleas, but I'll get used to them. Also, I can't get my metal any hotter than orange. With the briquettes that I was using before, I got it to forge weld temperature, and i even melted some projects with briquettes(on accident). What can I do to fix this,...what do all of master smiths suggest?

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Briquettes have a little coal in them and some other stuff that acts as a binder (doesn't sound too appetizing to cook over, does it?) so they may burn just a bit hotter.

I'd suggest you try busting the hardwood charcoal into pieces about at big as ping pong ball or a little smaller. More surface area spells more available heat. If you ever watch the Japanese smiths work on a sword in a charcoal forge, you'll notice the fuel is very consistent in size and fairly small.

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What wood are you using for the charcoal? You said hardwood but is it a fairly dense charcoal? Some woods are notorious for fleas apparently, and soft wood charcoal burns down faster than good hardwood charcoal, leading to more fleas. How deep is your fire? Is there a good white hot area for you to put your metal around/in? What size stock are you using? I'm assuming not too big from your previous posts but I could be wrong. What are you using for the air source. If you're not exaggerating about the fleas distance, you have some pretty good air pressure to push them that far.

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I am using two blow driers. Like the fleas are down and then boom there everywhere, then down, then boom. I'm using RR spikes. 5/16" round stock right now. My fire is 3-8in depending on where you are. There is a good white spot, but I don't understand why it won't heat to yellow or white. It's hickory and oak, at least that's what the bags say. it also a side draft forge that I built with bricks. It has air from the side and from the back.

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Always remember heat rises, so you'll get much more heat, and less oxidization closer to the top of the heart of the fire but you still want to stay in it. Have you tried moving the metal around with a constant blast and finding the hot spot? I'd also suggest backing off to one hairdryer, especially for the size of work you're doing and see how that helps with the fleas.

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m_brothers,
I can only guess, you can check these out.

As others have pointed out in previous posts, too much air can blow the heat right out of the fire. Use just enough air to get that tranlucent glow.

Are you making your own charcoal? If so, are you getting the wood fully charred? You can test this by how easily it breaks apart, and by how much flames and smoke in the forge. If you can't crush it or break it in your hands, then that's wood, not charcoal. Wood has to burn down to coals in the forge, you would notice smoke and excessive flames, and taller flames, at the start. Charcoal is way lighter than wood and squeaky.

Are you getting all of the ashes sifted out or washed out or whatever, the ashes can cool your fire. Also, sifting gets out the small particiles. Fines may be good in coal, but not in charcoal. If you make charcoal by a direct burn method, using wood splitt into 1" or 2" diameter sticks (length isn't important except as how it relates to the burning container) the wood will break up into uasable size pieces as it burns.

Charcoal brickettes are way different than wood charcoal. Charcoal gets an orange or yellow glow all the way through as its burning. If you have the charcoal stacked 8" deep with you work piece (say a bar) 2" below the surface, the charcaol on top will be mostly black and white, but you will see this yellow or orange glow below the surface. It getts brighter and yellower as the steel gets hotter. After a few times you call tell the color of the steel just by looking at the charcoal.

One thing, you said your forge was 8" in one place. Is there any possibility that the length of the piece of steel that you're using keeps it from getting into a good position in the fire? Is this steel similiar to what you've already had good experience with.

No joy yet? Maybe hand pick a couple gallon of you best pieces of charcoal and try forging.

Enough already, hitch hike to Indiana.

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I think it was too much air, tonight, I forge welded together to bars, which i later melted by leaving in forge for to long, i always have that problem, once i achieve a good heat. I melt my stuff by accident, anyway to prevent that, or to get piece out of fire before that happens

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Failures are sometimes the best way to learn something. The true failure is not learning from them. Something to think about the next time you're afraid to take a risk on something that may fail; most of the greatest scientific discoveries have been accidental findings from a failed experiment.

As for switching to coal, why bother at your stage? I enjoy the challenge of thinking around problems like this by picking apart the variables. Switching to a new fuel will likely lead to as many new problems and cost you money. If you can now achieve welding heat with this fire, start learning the nuances of your forge and charcoal. Once you learn how to control the fire, you can think about other fuels if you want, but if you have a steady supply of wood, why bother. IMO if it worked for how many generations of smiths, it can work for me too. Plus you're using a more renewable resource than coal when it's managed right.

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