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Under water plasma cutting is nothing new - it was first done in the mid 1970's. But it still has many advantages that lead many fabricators, steel service centers, and manufacturers to prefer it over dry cutting. An "Air Curtain" or "Bubble Muffler" is used to create a pocket of air around the front end of the torch, shielding the arc from the water. But not every thickness of every material can be cut under water. So what are the limits, and what happens if you push them?
There are a lot of great reasons to use a water table for plasma cutting. Under water plasma cutting reduces arc glare, eliminates dangerous noise levels, captures smoke, cools the parts, and reduces heat distortion. But one common objection to plasma cutting mild steel on a water table is steel’s propensity to rust.