I have a microwave oven transformer which i had damaged in the process of removing the high voltage secondary. I will be using this for spot welding 18650 cells. I have all the required figures

I wish to know if change the wire gauge would affect the current output in the secondary. I need the max current output. As far as i understand the heat loss and resistance depends on the primary winding gauge and the current draw in the secondary depends on the width of the cemetery core and the gauge of the secondary winding, correct ? With that said 22AWG would be a little less thereby creating more heat in the primary but would help adding more turns on the secondary thereby increasing current draw.

 

I wish to know if change the wire gauge would affect the current output in the secondary.

Changing the primary winding wire gauge will affect both the resistance and inductance of the winding if the number of turns is unchanged. If as a result the core saturated then you would have a problem.

 

Changing the primary winding wire gauge will affect both the resistance and inductance of the winding if the number of turns is unchanged.....

I don't see a significant change in primary inductance if the number of turns is unchanged.

 

The secondary only calls for 6 turns, I would be tempted to use the largest gauge that will fit, presently shows #3 AWG?
You want the lowest possible volt drop in the secondary.
Max.

 

so using 22AWG would saturate the core ? or is it the other way round ? Or do i just stick with what was there already on it 17AWG ?

 

I don't see a significant change in primary inductance if the number of turns is unchanged.

Oops. Was thinking resistance. Inductance would change as result of change in the number of turns if the winding space was unchanged.

 

So the wire gauge would be 22 or 16 for the primary 240v and how many turns ?

 

Did you count the turns on the primary? Probably around 2 to 3 turns/volt. the gauge should be the same or larger (16g) if anything.
Max.

 

count as in ? well i did not use any formulas or anything but used the excel sheet on this website http://ludens.cl/Electron/trafos/trafos.html to determine the number of turns. That way it showed 600 turns shown below. Would that be correct ? would it take too much space in the window ?