How can waterjet cut thru metals?
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Most metal-cutting waterjets include an abrasive in the water (basically, sandpaper grit). They’re not so much cutting the metal as sanding it away really quickly. Which is technically just bazillions of tiny cuts happening really fast.
Water jets run at *very* high pressure (think tens of thousands of psi). That, by itself, is higher than the yield strength of many softer materials and the water can cut those by itself by literally pushing material out of the way.
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