[Jewelry making - Article 00189] - Re: [Orchid] Brazing steel

[Ed Howard]

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    Selecting the right fuel gas for brazing is affected by what you are
    brazing. Acetylene produces the hottest flame but heat and BTUs are
    concentrated in a "pinpoint" at the tip of the inner flame that is
    best for joining smaller pieces where you want heat in a specific
    area. Natural gas, propane, and MAPP have a more bulbous, soaking
    flame that works better on larger, tubular pieces, say 1" diameter
    and larger, where a broad even heat is more desirable. Acetylene
    works on bigger pieces but you have to keep the torch moving so as
    not to overheat the work and possibly cause melting or other surface
    defects. A torch with natural gas, propane or MAPP requires less
    movement and heats a larger area, drawing the braze rod and filling
    the joint better. 

    My company has experience with brazers joining all combinations of
    copper, steel and brass with a range of filler alloys and invariably
    brazers like the bigger flame  of natural gas on larger pieces. 

Ed Howard
G-TEC Natural Gas Systems
www.safe-t-gas.com
www.gas-tec.com

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