23-05-2012, 08:14 PM
Reminds me of a few years back when they were having embarrassing transformer failures on the 25kv single phase units fitted to locomotive classes 86 and 87. The failures were traced back to nothing more than microfibres in the oil that were causing flashovers. OK, a welder is not quite in that transformer class but I would consider putting in the best you can afford as it will promote equipment longevity.
