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    #21
    Actually I need something that you can control the inrush current for a short period of time ideally that can handle 100 amp or more would be ideal

    The duration time can be controlled by a a microcontroller the monitoring the zero-point of the wave form also can be controlled by a microcontroller but to get them to work together is a another story

    The ones that are available have a couple of short coming one of them is that they limited to the amount of milseconds they can be adjusted to the other short coming is that you are limited the current output because in most cases the battery spot weld looks like crap because it either did not penetrate the metal on the battery terminals or the spot weld does not penetrate the battery terminals or the tabbing metal I want it to the point that it tears a small hole in the battery terminals or that it tears the tabbing but it literally leaves the tabbing material on the battery terminals so I back down the current a little bit to avoid that situation from happening

    Yea I know that that I might be asking for a prefect world but I want to get as close as possible to a prefect world as I can

    Yes you can get a modified micro wave oven transformer to get the battery tabbing hot enough for the tabbing to stick to the battery terminals but it has to stay on for at least a second for this to happen and the battery cell does heat up a little bit so this not a real good solution and for a battery welding transformer is ideal because getting it to work on a timer like you can on a microwave oven transformer is not as simple now you can with a transformer controller that does not have the timer function and you set it so that it does not trip the breaker but usually this hot enough for a good tabbing results

    So now the question is where do I find a breaker that is a “slower breaker to ignore the inrush current.” what is the search requirement to find this type of breaker

    I found this breaker from ABB “K type of breaker”


    https://www.ebay.com/itm/12610216461...Bk9SR9ys69qPZA


    I did some research and found several types of breaker types “A , B , C , D and K” type K has the longest trip delay for inrush current I going to buy a couple and try them on the welder transformer and see if this makes a difference in weather or not I run on my transformer controller at nearly full on or not because before I could not do that

    I know that I going to have to dedicate an outlet for this particular purpose from my electrical panel in my shed for this
    This should not be a problem because I ran #6 wire cables from the house to my shed and have 60 amp breaker in the house main panel for this sub breaker panel for the shed

    For this special outlet I going to use #6 cable for these two outlets for the battery stud welder transformer
    The transformer controller and for the special timer that I found that does milliseconds and seconds formats it also can repeat cycles for a certain amount of times as well

    So the wiring will not be fire issue the only smaller wiring will be to the breaker and the outlets because a #6 wire probably will not be able to be connected to them realistically and might to difficult to attain

    I do not like to cut strands off of a cable wire to make it fit in properly on a connector I try to avoid this at all cost if I can

    Realistically #6 cables can handle 55 to 65 amp loads depending on how long your run is it is about 100 feet run
    But seeing that this load would be for a certain amount of time and not continuous load I should be able to push the current limit a little bit for short durations with out any issues

    For a while I had a battery spot welder controller that worked very well for a while doing spot welding but eventually the controller went bad but when it was working it would dim the light in the house each time I would trigger it to weld my wife would ask me what I was doing to make the lights dim like that I would say that I was doing battery tab welding

    The only way to get this type of controller I would have to buy another battery stud welder that has this specific controller that actually works really well but it only lasts for a year or so for the amount of battery cells that I have been doing but my plans are to more of them than what I have done in the past so I need come up with something that works as good and last a lot longer than what I have been using
    Last edited by sam_sam_sam; 07-04-2024, 07:08 AM.

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      #22
      I plan on doing more battery cells than what I have done in the past and I need to come up with a solution for not getting the best tabbing results that I am looking for

      At this point in time I doing this to do a proof of concept test to see if it is possible to do it this way and not keep tripping the breaker doing it and to make sure that the wiring does not exceed 100*F while doing this I have a thermo imaging gun that I going to be using to for this test as well

      One note I going to have the air conditioner on one leg and the battery stud welder on the other leg so I am not over loading one leg and trip the breaker in the electrical panel in the house for the shed so far I have not tripped this breaker doing battery welding I have only tripped the breaker for the circuit for the battery stud welder outlet
      Last edited by sam_sam_sam; 07-04-2024, 07:24 AM.

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        #23
        Originally posted by stj View Post
        i dont think a power controller will help a welder,
        you need that current-spike for the welds.
        It probably will not help with this application but I have another project idea that it might help which when I have time to experiment with the idea I will post the results of what I find useful

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          #24
          Not based on triac, but also interesting circuit to lower AC voltage...
          https://m.youtube.com/watch?v=_HfknbJRo5I
          Attached Files

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            #25
            Well, that circuit makes a lot of heat dropping the voltage down. It's a series-pass design using a power transistor+bridge rectifier to do linear control. Need a big heatsink.

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              #26
              Here is a circuit that implements phase-control of heaters, adjusting their power smoothly from zero to around 95% of the rated power
              https://ludens.cl/Electron/thermost/thermost.html
              Attached Files

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                #27
                That looks neat, the two transistors make the circuit sensitive, it does not require much current to activate the triac.
                But... what is the difference between say 25% and 75% power? Is it 1 or 2 or 3 degrees etc. Depends a lot on the thermistor curve.

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                  #28
                  Very interesting circuit design

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