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What amps for 2.5mm metal

  • 16-04-2020 8:53pm
    #1
    mengele
    Registered Users, Registered Users 2 Posts: 887 ✭✭✭


    What amps would you use for welding new 2.5mm thick new metal to 2.5mm thick old metal that might be even lighter. Also should I use a 3.2 rod or 2.5 rod?


Comments

  • #2
    satstheway
    Registered Users, Registered Users 2 Posts: 831 ✭✭✭satstheway


    mengele wrote: »
    What amps would you use for welding new 2.5mm thick new metal to 2.5mm thick old metal that might be even lighter. Also should I use a 3.2 rod or 2.5 rod?

    Experienced person will manage easily with 3.2 but lower amps and smaller rod might suit someone with less experience. Its fairly light metal so holes will appear very fast.
    What I'm saying here is if you need to ask go with lighter rods. And try on scrap pieces first.


  • #3
    Micheal H
    Registered Users, Registered Users 2 Posts: 187 ✭✭Micheal H


    mengele wrote: »
    What amps would you use for welding new 2.5mm thick new metal to 2.5mm thick old metal that might be even lighter. Also should I use a 3.2 rod or 2.5 rod?

    The quick rule of thumb is about 40 Amps per mm thickness of steel. So with 2.5mm you're looking at 100 Amps. Though with one of those pieces being old and a bit lighter, best to start off with 80-90 Amps and see how that goes. Better yet, as satstheway said, try and get a few pieces of scrap of the same size to practice on first.

    As for the rods, 2.5mm will do the job. They usually run in the 70-110 Amp range - it'll say on the box.


  • #4
    SuperTortoise
    Registered Users, Registered Users 2 Posts: 3,173 ✭✭✭SuperTortoise


    2.4mm rod, ~65amps, electrode negative.


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