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General Motors' Cadillac division has always prided itself on its super-quiet cars, so the General's promotion of its "ultrasonic" welding technique for the upcoming ELR extended-range plug-in may or may not make sense, depending on how you define the term. In this case, GM says the ultrasonic welding allows machines to put together metal electrode tabs on the car's 16.5-kWh lithium-ion battery pack through rapid motion that creates heat through friction. Most importantly, it eliminates the need