Hello Baja. Well, right now I am a welder in a coal mine. And on all of the heavy equipment with computers we have to shutoff the master switch wich kills all of the juice to everything. And, it has never damaged a thing yet. And, I think if you where to un hook the batteries you should be fine. What are you wanting to weld on to it??
Hope this Helped,
Chris

One thing that may be helpful is to ground directly to your work.