[Jewelry making - Article 00020] - [Orchid] Oh no - More torch questions

[Stuart LeVine]

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    I am an all around craftsman who learned to make jewellery using a
    torch and a tank of Propane.   Now I am teaching myself to work on
    larger things and have purchased an Oxy-propane system with a Sol-Gar
    torch (Spanish manufacturer) which is slightly bigger than a Little
    Torch.  The largest head of the torch I would estimage to be
    equivalent to the #7 of the Little Torch. 

    I am building a small box of 1.25 mm copper 6x4x4 cm.  Total weight
    of the copper is 110 grams. 

    It is taking about 2 minutes worth of welding to get make a weld.  
    After about 1 1/2 minutes the flux turns glassy, then the copper
    starts to glow red hot, then all of the non-fluxed parts of the box
    turn a silvery-black color, then the solder (medium) melts.   There
    is no fire-scale.  The black goes away after a few minutes in the
    pickle. 

    Does this sound right? 2 Minutes seems long to me but I have never
    worked on "large" things before, and I want to build things even
    larger. 

    I have read all of the archived messages on Orchid about torches and
    I am a bit surprised at the lack of clear specs for the rights size
    torch for a job. 

    Shouldn't it be possible to say that for a certain size/weight of
    metal to be welded what the BTU/temperature required is and hence
    which torch can/cannot handle the job? 

    Why is this issue being debated? 

Thanks for any help

Stuart LeVine
Israel



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