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.

 

Could you perhaps post a drawing or photograph of what you've built?

 

Good day,

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

 

And here is the principal drawing

 

And here is the principal drawing

what drawing, nothing here...also welders use high current to weld, maybe there is not enough current output?

 

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.