Tungsten has a melting point of 6100 degrees Fahrenheit. Something beyond any known chemical reaction is taking place for that to happen. And Mills didn't want it to happen.
I think you meant to say that Mills claims the Tungsten was vaporized, not melted. And he knows this because spectral lines for W atoms appeared in the spectrometer trace. The boiling point for W is about 10.6k degrees F. And we know that this is difficult to do because defense technologist have searched for centuries for the most efficient way to destroy heavy metal (i.e. tank armor). If all it took to win a tank battle is to trot out a couple of hair dryers and melt your opponent's defensive shield then I think we'd have that kind of weaponry by now.