Electric soldering machines

I’m into making tools. I’ve built my own flexible shaft machine
and buffers, they work like a charm. I now would like to try my
luck with an electric resistance soldering machine-about
2000watts seems right. I have the necessary transformers and
diodes but I need to know whether they are ACorDC , what
voltage range, which polarity the work /electrode and what
diameter the electrode. Any help would be greatly appreciated.
Thanks in advance Jim in rainy B.C.