That depends on a number of things like the percentage of electronics on board and more importantly. the location of the ground clamp (and how clean the grounding point is) in relationship to the weld (electrical discharge) it is. Stray currents are effectively mitigated when the grounding clamp is close to the weld process as physically possible. Myself, I'll always establish a clean (paint and corrosion free) grounding point as close to the weld as possible without physically interfering with the weld itself. Never disconnected a battery (if welding on a tractor or motor vehicle) and I've never had an issue with 'frying' any electronic component. Stray currents occur when the ground point is away from the weld or the ground point is corroded or is a high resistance point.
