Volt/amp meter

  1. MBB Forum Supporter

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    northumberland
    Has anyone added a volt and amp meter to a mig welder?
     
  2. the snooper

    the snooper getting older by the day

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    Hull UK
    Problem is how would you monitor it ?
     
  3. MBB Forum Supporter

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    1,001
    Location:
    northumberland
    I dont know, that's why I asked.
     
  4. the snooper

    the snooper getting older by the day

    Messages:
    20,448
    Location:
    Hull UK
    Might be worth a look on eBay if one exists that will store the info at least you can look back at it
     
  5. eddie49 Member

    MBB likes this.
  6. MBB Forum Supporter

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    1,001
    Location:
    northumberland
    Welder goes up to 180 amp voltage up to 30v. but I think I may order one for another project.
     
  7. hotponyshoes Member

    Messages:
    2,482
    Location:
    Somerset. Uk
    Some of those current shunts can be wired in parallel to double the amperage.

    I have also seen them fitted directly to the battery on boats when the starter motor must be pulling more than the rated capacity on cranking.
    That might work on a welder as you might be less likely to need accurate measurements at higher amps anyway?

    Another option might be to fit a shunt for current and some wires for voltage, feed to some 4mm panel mounted sockets then just plug in a multi meter with a min/max hold function if you dont need to monitor it all the time?
     
  8. eddie49 Member

    It needs a 4v to 30v DC supply to run the digital meter.
     
  9. mike 109444

    mike 109444 Member

    Messages:
    4,254
    uk Bristol
    What are you looking to achieve by these readings ?
    At the very least you could set your phone on record (or a cheep and cheerful camera) and point it at welder, then weld with meters fitted and review footage.
     
    anjum likes this.
  10. Spark plug

    Spark plug Member

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    The readout on my welder holds the last reading, when you release the trigger so you get a good idea of what’s going on.

    You could possibly look at getting a unit as a spare part from another machine and retrofitting it?
     
  11. hotponyshoes Member

    Messages:
    2,482
    Location:
    Somerset. Uk
    A better investment might just be to buy a multi-meter with amp clamp and record/hold function?
     
    brightspark likes this.
  12. MoreWellie Member

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    1,156
    Location:
    Bedfordshire, UK
    the voltage would be the ocv (open circuit voltage) not the whilst welding voltage

    much simpler to get a clamp meter and put it around the return lead, a lot of these have max hold as well

    edit: too slow
     
  13. eddie49 Member

    Current shunts up to 200A are also available:
    https://www.ebay.co.uk/itm/DC-200A-75mV-Current-Measuring-Shunt-for-Analog-Ammeter/382850718307
    and 300A:
    https://www.ebay.co.uk/itm/Amp-Ammeter-DC-300A-75mV-Current-Measure-Shunt-Resistor-K2Y8/233560901091

    An alternative that would allow recording is to use a Hall-effect current transducer:
    https://www.ebay.co.uk/itm/LEM-HTB-50-P-SP5-OPEN-LOOP-HALL-EFFECT-CURRENT-TRANSDUCER/303531812488
    https://www.ebay.co.uk/itm/DC-5-120...age-Amp-Meter-Hall-Effect-Sensor/401897796878
    and store the output on a PC for later review.
     
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  14. Munkul

    Munkul Member

    Messages:
    2,126
    Cumbria, UK
    I put a voltmeter on my old Cemont. It's the easy one :)

    https://uk.farnell.com/murata-power...8icgaAktlEALw_wcB&CAWELAID=120173390000249900

    Self powered, rigged between return socket and wire feeder lead. Worked well.
    Remember that these only read a true voltage when welding, so someone has to look at it while someone else welds.

    Ammeter is the harder one... I thought the best way would be a big current shunt like Eddie says. But if you have a wire size/speed/amps chart, you can work it out from wirespeed anyway.

    The Kemppis at work have a nice setup. Kempomats which I got MSD-1 plug-in modules for, switch between volts and amps, very neat although basic still.
     
  15. Wozzaaah

    Wozzaaah The wizard of woz Staff Member

    Messages:
    14,843
    Wiltshire, UK
    If you can find one with a hold feature it would be advantageous but the one on my Butters is next to useless as you can't see what it's reading when you're welding.
     
    MBB likes this.
  16. brightspark

    brightspark Member

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    29,923
    Location:
    yarm
    just get a clamp meter with peak hold and inrush current . handy for everything else as well
     
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  17. Dadweld New Member

    Messages:
    14
    Location:
    Goring, Oxfordshire
    I have a Tecarc 181. It says on the blurb on the respective sellers websites that you can have a digital meter kit factory fitted or fitted retrospectively. There are cut outs on the front panel to take it (I think). I'm considering the latter option because I think it would be beneficial to know what exact settings you're using. However, if it's only live readings, it's not so useful unless you have someone else watching or record on ya phone.
     
  18. TechnicAl

    TechnicAl Member

    Messages:
    7,477
    Location:
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    This is what the Pros use........TVC were 2 young lads, Chris and Kim who made a box of tricks way back when (connected to TWI back then)....We (Welding Rods then) bought one of the first....so we were publishing actual data for welds long before anyone else could even measure it....we had heat input for every run in joints (unheard of at the time)

    https://www.tvcalx.co.uk/downloads/datasheets/welding-data-loggers/alx-iii-series/

    Just remembered....back then we called it a PAMS unit...Portable Arc Monitoring
     
  19. wacky7791

    wacky7791 Member

    Messages:
    167
    Location:
    SEQ australia
    I put a wire speed volt meter on a SIP, pretty useless as it only showed a read out when actually welding BUT it did show the power slowly creeping up if the trigger was held.
     
  20. wacky7791

    wacky7791 Member

    Messages:
    167
    Location:
    SEQ australia
    small voltage reader
     
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