power transformer issu

Discussion in 'The Projects Forum' started by jeka616, Mar 24, 2014.

  1. jeka616

    Thread Starter Active Member

    Jan 14, 2009
    121
    1
    Good day colleagues

    I have built a MIG welder. The power transformer is 10smx10sm inner core size. The primary is 220/380v selectable. Secondary has several outputs, from 16v up to 30v. The primary winding is 1.5mmx3mm copper wire. Secondary is 2mmx10mm copper wire.

    The issue is, the voltage is there, but when I try to weld, it drops significantly and there is no current. Basically the transformer does not have power. I was warned that it requires special construction, i.e. placement of metal sheets in proper order, to have fully covered magnetic field, otherwise it will not work. I think I've built it wrong.

    Can someone advice me some tips on constructing high power transformers?

    Appreciate.
     
  2. richard.cs

    Member

    Mar 3, 2012
    162
    31
    Could you perhaps post a drawing or photograph of what you've built?
     
  3. jeka616

    Thread Starter Active Member

    Jan 14, 2009
    121
    1
    Good day,

    yes, please find attached. It took me a while to get to my country house and snap a pare
     
  4. jeka616

    Thread Starter Active Member

    Jan 14, 2009
    121
    1
    And here is the principal drawing
     
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    what drawing, nothing here...also welders use high current to weld, maybe there is not enough current output?
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,507
    2,367
    Unlike SMAW (stick) welding, TIG and MIG require a steady voltage, your coupling between pri and sec is probably the reason for the voltage collapse, many have used a old Microwave oven transformer for MIG.
    Max.
     
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