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  1. #1
    Join Date
    Feb 2012
    Location
    Sydney
    Posts
    61

    Default DC Tig questions

    I currently have a DC scratch tig set-up which i use for steel and some stainless. I was wondering is it possible to tig brass. We have a large brass job on at work and silver solder does not fill like we need. Is it possible to tig brass, 2mm thick at most. If so, what tungsten? Pure argon? Anything i should know?

  2. #2
    Join Date
    Feb 2010
    Location
    Ballina, NSW
    Posts
    900

    Default

    Personally never tried it, but this video shows it How to Tig Weld Brass - A Tig Welding Brass Repair Job - YouTube

  3. #3
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,541

    Default

    One place I worked we had a couple of guys who did a beautiful job with TIG on brass, copper etc. (They were the guys who made me realise how skilled a good welder really is). I can't remember all they told me but I think one of the issues with brass was the zinc - you need to keep total heat as low as possible (pulse etc) as otherwise the zinc tends to boil out then you get oxide, fumes and a poor weld. They might have even let the weld pool freeze up between pulses. Sorry - it was a long time ago and at the time I was still concentrating on stick.

    Michael

  4. #4
    Join Date
    Mar 2008
    Location
    Australia
    Posts
    74

    Default

    EWM TIG primer has a chart on page 17 showing metals and electrode polarity. It says AC is best for brass, DCEN can be used.

    "7.4 Copper and copper alloysThe welding of copper is more compli- cated primarily because of its high level of heat conductance. With larger panel thicknesses, the material therefore needs to be pre-heated at least at the start of the weld seam. A pre-heating effect is produced later on by the forward welding heat, which means that large-scale pre- heating is only required for wall thick- nesses > 5 mm. The TIG process pro- vides the option of using the arc itself for pre-heating, by using an extended arc in circling movements to heat the start of the weld seam.
    Pure copper and many Cu alloys are welded using direct current, with the elec- trode on the minus pole. Only a few bronzes such as brass and aluminium bronze are better welded with alternating current."

    Haven't tried it yet.

  5. #5
    Join Date
    Feb 2012
    Location
    Sydney
    Posts
    61

    Default

    Thanks for all the help guys, i gave it a go, it worked but it was not easy. We are going to give mig brazing a shot

  6. #6
    Join Date
    Mar 2008
    Location
    Australia
    Posts
    74

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