Improving my setup in Beginners Place Posted October 10, 2020 1 hour ago, Alan Longmire said: If your tube has one end closed, a piece of wood, coal, coke, or charcoal pushed to the far end will consume all the oxygen in the tube. What this means for your steel is there will be no scale formation, no decarb, and an easy cleanup after hardening. Same thing if your forge is running in reduction, that means all available oxygen is consumed. If you do that with a gas forge, though, be aware you'll be pumping out huge amounts of carbon monoxide and ventilate accordingly. Thank you sir. Just got done welding a tube up. I ended up putting a piece of plate with a hole for my tube across the front. But thinking about it it will probably get really hot so I may need to cut that part off.