You might be right there, amigo. Normal soldering temps, for mild steels, run in the 650 degree F range, brazing in the 800 degree F range (cast iron, especially sand cast with cope and drag pattern CI- closer to 900 degree F-- temperatures taken at the core of a neutral or balanced flame, with oxy-acetylene-- different temp scale if you are using either MAPP or propane for your fuel gas-- The only layman styled concept of barrel joining was what I read years ago in Peter Johnson's book on the Parker Gun--RWTF
