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Toyota Will Adopt Tesla-Style Cast Bodies That Might Be Impossible to Fix
(www.thedrive.com)
This is a most excellent place for technology news and articles.
Welding a casting is a lot more dubious even if you can access it easily. If the original material was welded together chances are it can be rewelded without much issue. Most successfull welds in cast material I've seen have been in compression, it tends to split around the weld when you put it under tension.