English electric arc welder

  1. Michael norton New Member

    Messages:
    5
    Location:
    Uk
    Hi all been a welder for about 20+ years,and been clearing units for the last 10 years.i recently got a really old English electric oil cooled cooled 250 amp welder.doesnt have any leads.but as 2 large terminals at the back and one at the side.its the same one jcb started there business with.2 big amp switches.and large deepstick.on the top.i weld Skips up for a firm and always have good results with oxfords and other oil cooled sets.i want to know how to wire it up.ive had the cover off the top.there no connector apart from the two large connectors.at the back.i really want to get this back running.any pointers would be appreciated.
     
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  2. pedrobedro

    pedrobedro Man at Matalan

    Messages:
    10,003
    Location:
    CX Derbyshire
    You want to sell that to a museum by the sound of it, JCB would definitely be interested I bet. :D Put some pictures up someone will have seen something similar and have an idea what goes where. What does the amperage control look like on it ?
     
  3. Michael norton New Member

    Messages:
    5
    Location:
    Uk
    Hi il go over to my unit this morning and get some pics the amperage control are grey alloy disc that click when you turn them,like a oxford but you don't have to lift,to select amperage.il take some pics to get you some idea thanks again
     
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  4. Michael norton New Member

    Messages:
    5
    Location:
    Uk
    Hi thanks here’s the pics any information on wiring it back up.to good to scrap British engineering at its best
     
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  5. Rig Pig

    Rig Pig Member

    Messages:
    3,558
    Location:
    Narrwich! U.K.
    It's a Quasi Arc machine, there are quite a few posts on here about them and on the internet in general.
     
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  6. Stingray Member

    Messages:
    421
    Location:
    Northern Ireland
    Quite a new one by the looks of it, the ones I’ve used had more rounded edges and bigger controls for adjusting amps...
     
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  7. Michael norton New Member

    Messages:
    5
    Location:
    Uk
    I've found nothing on the internet on this model.maybe the newer quasiarc ones yes.but this is from the 1940s same as jcbs first welder.ive had a few of the 300amp 4 wheel type with handle on the front.they where easy to wire up.
     
  8. Tigman

    Tigman Forum Supporter

    Messages:
    2,793
    Location:
    Watford UK
    Hi Michael take the small plate off the top and take a picture of whats inside , im sure it will be the same as mine
     
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  9. Tigman

    Tigman Forum Supporter

    Messages:
    2,793
    Location:
    Watford UK
    have a look at the thread " Quasi-Arc ACP 450P "
     
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  10. Wallace

    Wallace Member

    Messages:
    6,584
    Location:
    Staines, Middlesex, England.
    Nice looking bit of kit, have you tried Googling the diagram and transformer numbers listed on the name plate?

    Watch out for any switch marked “afterburners”!

    18E57DB6-E9B9-4887-896B-CD076053ED14.jpeg
     
  11. Michael norton New Member

    Messages:
    5
    Location:
    Uk
    I'll get some pics tommorow I took the plate off it'about a week ago and was straight into the transformer tank filled with oil no connection blocks .
     
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  12. Tigman

    Tigman Forum Supporter

    Messages:
    2,793
    Location:
    Watford UK
    really , thats not like mine then !:whistle:
     
  13. harveyblades New Member

    Messages:
    16
    Location:
    cornwall uk
    [​IMG]

    2 large terminals at the back are input power. I had to make plugs for mine. One at the side is welding current. 2 bolts at the front near the bottom. Big bolt is to drain it, smaller bolt right hand side is ground. Image above shows you how to connect it for 200v or 440v input voltage. Open the small hatch on the top. Gloves and respirator advised as PCBs in the oil. I have mine set up for 200v and am running it on 240v single phase – bit hot but those are the options as far as I can tell.
     
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  14. harveyblades New Member

    Messages:
    16
    Location:
    cornwall uk
    [​IMG] [​IMG]

    First image is what you'll see when you open the hatch. Second image is it's 600 amp big brother.
     
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  15. Memmeddu

    Memmeddu Member

    Messages:
    1,692
    Location:
    Italia Sardegna
    How works it?
    I can not understand how you dial the amperage.
     
  16. Rig Pig

    Rig Pig Member

    Messages:
    3,558
    Location:
    Narrwich! U.K.
    I think you set the amps on these dials.
    Screenshot_20200214-144033_Chrome.jpg
     
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  17. harveyblades New Member

    Messages:
    16
    Location:
    cornwall uk
    [​IMG]

    Here's a look inside with the whole lid taken off. Those circular pins are where the amperage is adjusted by the dials when the lid is on. Probably a big inductor under there to flatten out the ac waveform and reduce the amperage that way. Not sure though, certainly not sticking my nose in there as that oil is nasty stuff.
     
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  18. Memmeddu

    Memmeddu Member

    Messages:
    1,692
    Location:
    Italia Sardegna
    Ok now I've understood ,the two bar on the left are commutators
    switching the primary windings is possible to adjust the amperage/voltage output
    Less the resistance , higher the input current, higher the voltage and current output
    The other one switches the various secondary windings (probably making the parallel)

    I'm pretty sure that the two big knobs you mentioned are what you are supposed to use to connect the mains power
     
  19. harveyblades New Member

    Messages:
    16
    Location:
    cornwall uk

    Sure, not looked at it in depth due to the oil hazard. Mains power is connected in the circled part.

    [​IMG]
     
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  20. Memmeddu

    Memmeddu Member

    Messages:
    1,692
    Location:
    Italia Sardegna
    I will say something I've never thought because reasons.
    But I want one of those oil cooled units , never saw one , never used one , never thought to want one
    But I found you all are pretty happy with them and they are kind of cool/different standards design from what we see nowadays here in Italy
     
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