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For what its worth, naval vessels have had aluminum upper decks and superstructures welded together since the 1980’s. Consider that bi-metal quarter in your pocket as an example of explosive welding, while the US Navy has used an (mig style) shielded electric arc process fir decades. Problems...

You must be thinking of ww2 radar….todays radars are much more sophisticated and can even emulate colors as well as clear, crisp, shapes, in addition to typical trajectory information. Rob