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I'll re-ask part of Rods post: reworded: Is silver brazing going to result in an oxygen problem the same as welding would??? Brazing doesn't melt the base metal....Pete
Hi Pete,I would suggest you review this excerpt from the same publication."Page 38Brazing CopperOxygen-bearing coppers are susceptible to oxide migration and Hydrogen embrittlement at elevated temperatures. These Coppers should be furnace brazed in an inert atmosphere or torch brazed with a neutral or slightly oxidising flame."
This is where I have always received my definitions:"Brazing - The American Welding Society (AWS ), defines brazing as a group of joining processes that produce coalescence of materials by heating them to the brazing temperature and by using a filler metal (solder) having a liquidus above 840°F (450°C), and below the solidus of the base metals.""The basic difference between soldering and brazing is the temperature necessary to melt the filler metal. That temperature is defined to be 842ºF/450ºC by the American Welding Society (AWS) but is often rounded to 840ºF. If the filler metal melts below 840ºF the process being performed is soldering."I don't know how the rest of the world defines these things but I suspect it is similar.Just trying to clarify....Pete
Another question in all this - does it matter if the boiler is going to be coal-fired or butane fired when complete? I have seen some references in the past to additional issues with alloys on coal-fired boiler