How to reduce current

[Jane]

In my project I am using a transformer that has secondary current of about 700A /3V. In a certain periods I would need to cut the secondary current to about 300A only.
What is the best ( easist) way to do so?

[Simon]

erm, only use 300A  . This is more a question of the load than the transformer, what are you doing with it ? welding ? The transformer will give what is asked of it and at 3V/300A any current limiting prractice needs to be as closely tied to management of the load as possible.

[Jane]

Yes, it will be used for welding

[jolshefsky]

I watched about how welders work. The basic idea, I gather, is that a chunk of ferrous metal is inserted into the transformer core which causes it to saturate, thereby being less efficient, and thereby outputting less current. You vary the current by varying the position of the ferrous metal.

[Jane]

@jolshefsky Thank you for the interesting video