Battery charge terminal on old Oxford transformer welder

  1. Eyebrows Member

    Messages:
    32
    Location:
    Bristol, UK
    I was wondering whether someone may be able to shed some light here. I have an old Oxford bantam transformer welder. Its one of the ones with a fourth terminal on it for battery charging supposedly. I was just wondering how this was setup within the welder? How is the current and voltage regulated and how is the DC formed? I assumed it's rectified the single phase input but does it have any methods of smoothing the high frequency output of the rectifier (i.e. capacitors, chokes etc)? Is the voltage accurately regulated or is it a bit high and risk boiling batteries if you're not careful?

    Not planning to charge batteries on it, maybe see if I can use it for a booster. Mainly just want to know how it works as I don't want to go about taking the heavy top off the welder!
     
  2. gaz1

    gaz1 Member

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    westyorkshire
  3. Paul.

    Paul. Moderator Staff Member

    Messages:
    6,645
    Location:
    Northampton. UK
    More likely that the 4th terminal is for a carbon arc torch, I cant remember seeing one with a battery charge facility.
     
  4. brightspark

    brightspark Member

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    31,765
    Location:
    yarm stockton on tees
    as above carbon arc. it would have to have a rectifier if it charged battery's and they haven't a 12 volt supply tapping
     
  5. Eyebrows Member

    Messages:
    32
    Location:
    Bristol, UK
    Not sure it is for a carbon arc torch, I'm pretty sure it mentions something about battery charging on it. I'm not actually with the welder until next week but I'll get a picture then and check properly what it says .

    If it is for a carbon arc torch. Please excuse my ignorance but what are they and when are they used?
     
  6. brightspark

    brightspark Member

    Messages:
    31,765
    Location:
    yarm stockton on tees
    a carbon arc torch is hand held . its 2 carbon arc rods when touched together they arc and produce a lot of heat and can be used for heating or brazinghttps://
     
  7. Paul.

    Paul. Moderator Staff Member

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    6,645
    Location:
    Northampton. UK
    WorkshopChris likes this.
  8. eddie49 Member

    Here's a label from a Bantam that has the feature:

    Bantam-Oil-Cooled-Arc-Welder-battery-charger-booster.jpg
     
    Wendelspanswick likes this.
  9. gordon stephenson

    gordon stephenson Forum Supporter

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    7,020
    Location:
    Skelton in Cleveland U.K.
    A friend of mine has the battery charger model
     
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