Amps for 4mm rods

  1. Liam567 Member

    Messages:
    132
    Location:
    Ireland
    Hi lads just out of curiosity what size welder would I need to burn 4 mm rods .
     
  2. Memmeddu

    Memmeddu Member

    Messages:
    2,954
    Location:
    Italia Sardegna
    4mm 160A up to 220A I believe
     
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  3. James1979 Forum Supporter

    Messages:
    1,607
    Location:
    Orkney
    Its more about duty cycle to be fair. My Thermalarc 175 will do about a rod and a half and wait a while and it'll do it again. My diesel welder will burn them in hot all day and not get too far above idle.......
     
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  4. rory1

    rory1 Member

    Messages:
    1,183
    Location:
    Macclesfield
    I usually start off about 175 for a 4mm
     
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  5. metalmelt Member

    Messages:
    595
    Location:
    UK
    It really depends on the electrode, some will melt at about 90 amps and this can vary with AC or DC and will give little penetration, while others need around 200 amps DC to give a decent weld; it also depends on the welding plant and its output and duty cycle as a domestic plant will quickly trip out on thermal within a few rods.
     
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  6. Feet 'n Inches

    Feet 'n Inches Out of the rat-race at last

    Messages:
    364
    Location:
    Devon, GB
    My preference would be an oil-cooled machine, if you're in the workshop, no problems with duty cycles. Trouble is, to run the kinds of current 4mm rods need you'd need a 3 phase supply. I don't know much about inverters but if you can find one that handles the kind of current, suggested by @Memmeddu, with a decent duty cycle you might get away with a dedicated 20 amp circuit on single phase.
     
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  7. metalmelt Member

    Messages:
    595
    Location:
    UK
    Many DC inverters of around 200 amps or higher will easily handle them and 5mm.

    You have a choice of DC invertor machines running off 240 single phase around these currents, albeit over 13 amp input.
     
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  8. Memmeddu

    Memmeddu Member

    Messages:
    2,954
    Location:
    Italia Sardegna
    My inverter will stay in the 13A only if under 100A output current.
    I can drain 16A continuously out of my powermeter , and up to 32A for 2 minutes .
    I have a separate dedicated circuit for welding
     
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  9. brightspark

    brightspark Member

    Messages:
    31,750
    Location:
    yarm stockton on tees
    32 amp single phase supply for a 180 amp oilcooled
     
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  10. Turbo Member

    Messages:
    3,856
    Location:
    Fermanagh, Northern Ireland
    My oil cooled pickhill will happily run 4mm rods at 165a running on a 16a single phase supply.
     
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  11. metalmelt Member

    Messages:
    595
    Location:
    UK
    My inverter will run 250 amps at 16A MIG and 220A in stick.
     
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