Disconnect battery for spot welding?

[reptile]

I'm in the process of replacing my rad support for my 2G.

I acquired a 120v spot welder from Harbor Freight so that I can reproduce the spot welds on the new support.

I'm reading online that it's a good idea to disconnect the battery prior to any welding work which makes sense.
Is there anything else I should potentially disconnect to prevent potential damage?

Thanks!

 

[19Eclipse90]

It is a good idea to disconnect the ECU, as well.