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I agree, spin welding is very cool!! Everytime you pick up an insulated plastic cup or any 2 peice plastic part they are either spin welded or sonic welded. But, you haven't seen anything until you see Explosion Welding, now thats really cool!i think that is all amazing and awesome but the coolest thing was seeing how they make the aluminum wheels
from a tube of aluminum it rolls a bed and makes a hump then the 2 halves are then pressed together and then fused to make it 1 piece or a wheel
that is awesome sounding