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Message: <blockquote data-quote="Steve-Oh" data-source="post: 1169568" data-attributes="member: 8243">When we used to air arch / weld lids on and off the top of transformers for PECO, an absolute must was a nitrogen purge through the entire transformer to keep the oil from igniting.  Don't know if this is an option but just an FYI.Now especially since we are dealing with aluminum here I still wouldn't recommend trying to weld this thing with any oil residue near the weld.  Aluminum is very susceptible to contamination which can result in a poor weld.  When aluminum gets contaminated the puddle starts to ball up and there's no recovery after that, you need to grind it out and try again.  We used to clean all our aluminum with acid prior to welding.Sent from Space</blockquote>