Hi. I’m new here. I just ordered a K40 after months of deliberation.
A good friend of mine used to be a partner in a business that designed, built, and sold 1200w co2 laser systems. You read that right. Could cut through inches of steel. Says the beam looked like a flaming sword since it ionized all the surrounding gasses and you’d see the resulting corona discharge. The caveat is that at those power levels you need a cover gas, and that the superheated cover gas is actually doing most of the cutting. Compressed argon plasma vaporizing everything in its path - can only imagine.
Says he has a patent on a nozzle that produces laminar flow inside and surrounding the beam. He has advanced degrees in EET and chemistry and is very much retired. He did ask if the K40 market would be interested in a laser head with a laminar flow nozzle though.
Anyway, earlier tonight i told him that i’d read that high-impedance coolant is required but that RV winterizing coolant, not engine coolant, can be used to retard mold growth and prevent freezing at concentrations of like 15-25%.
He said that high-impedance coolant is indeed required and that the RV coolant will be ok for those tasks.
I didn’t ask why not automotive coolant, but i would hazard a guess that the additives in automotive coolant that retard galvanic corrosion in enignes that have a mix of iron, aluminum, and copper/brass/bronze metals probably greatly reduce the impedance.