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I Forge Iron

ne_smith

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  1. Two thing right of the bat, I am using a know design and built as designed. Don't assume things. Now to the can't put extra heat into a burner, well you can by changing orifice size and or pressure. Heat is measured in BTU, temperature is in degrees. Two related but different things. I'd agree that can't effect temp, except for over a small range dependent on the amount of oxygen available. Think of heat as volume, we say a large bonfire was really hot compared to a tiny campfire, when it only feels hotter due to a larger volume of heat (more btu's) and not temperature (degrees). Another way to think of this is your tip size on a oxy/acetylene torch. With welding tips you select the size based on material thickness, because you need more heat to weld thicker material. You change the orifice and sometimes the pressure setting. Furnace and appliance techs make these types of changes to burner assemblies regularly.
  2. Frosty, thanks for the reminder that the refractory liner needs to be included, that dropped my volume about 90 ci. Now admittedly this is my first propane build, and I was double checking numbers trying to get a good orifice size, right now I'm at .030 mig tip, and found this and the post that is previously linked that had lots of Ron Reil info. I also came across this page, http://www.joppaglass.com/burner/highp_chart.html. So trying to figure how much btu I might need, I realized that it really depends on the mass of steel I am trying to weld. Just for example, and prob not 100% accurate, say it takes 100 btu to boil a pint of water in 5 min, works well and heats up my ramen noodles. But that same 100 btu will not the 6 quarts of water for my pasta noodles, it may get there given enough time and insulation, but I'm not waiting that long. That all said if I can't get to the amount of heat (btu's) needed I could rebuild with another burner; move up to a larger orifice, until I run into the limits of airflow in an atmospheric burner; increase gas pressure, with the same airflow restrictions.
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