I bought a few of these controller boards
https://www.ebay.com/itm/Spot-welder...53.m2749.l2649
These are very nice Controllers
This controller allow you to set the current on the transformer from about 4 amps ( 25 setting value on the controller ) to maximum of 100 amps
It also has three different pluse setting timers setting value from 0 to 20 maximum
which if all three timer are set to 20 the ON time is quite long
Setting the controller takes a little doing there is a learning curve to it
This controller is a lot better than the controllers on the battery spot welder I have bought
https://www.ebay.com/itm/Spot-welder...53.m2749.l2649
These are very nice Controllers
This controller allow you to set the current on the transformer from about 4 amps ( 25 setting value on the controller ) to maximum of 100 amps
It also has three different pluse setting timers setting value from 0 to 20 maximum
which if all three timer are set to 20 the ON time is quite long
Setting the controller takes a little doing there is a learning curve to it
This controller is a lot better than the controllers on the battery spot welder I have bought