Stainless steel burr.

[bmfaubert]

Hi, Im new to this forum and still somewhat new to laser cutting. my question would be, how do I get 2.5mm thick 304 stainless steel to cut with NO burr or slag on it or minimal burr or slag. the company Im working at has a Prima Optimo 5 axis laser cutter. Im trying to cut 2.5mm thick 304 stainless steel and there is a burr on it about 0.010in or 0.254mm thick. Here are the cutting parameters Im currently using, Shutter:3, Type:2, Power:700, Frequency:80, DutyC:20, Gas Pressure:4.0, Gas Type:Oxygen. Im also using a 1.5mm tip. My standoff is 1.2mm. I have tried probably a hundred different changes to my parameter settings and so far this is the best I have found. I do also have the option to use Nitrogen at my shop. If you have any knowledge that would help me out then Id greatly appreciate it. Thanks!

 

[LASERNINJA]

Yes. Switch to nitrogen. Full power full freq, full duty. 0.7 MPa. 120 inches per minute.

 

[Foostrap]

As mentioned by Laserninja, using nitrogen will give you the best results. When cutting with nitrogen, use full power, max freq and max DC. Increase your gas pressure to 8 bar. Focal point should be below material surface; between 1/2 and 3/4 of the material thickness. You may have to use a bigger nozzle if you still get a hard burr all around.

 

[laserdog]

Go to a 3.0 single flow nozzle

 

[amadarama]

I agree with the above. You've got to go with Nitrogen and a larger nozzle and more gas pressure and .020" or .5mm gap. (8-10 bar pressure with a 2mm nozzle is what I use) Also maximum freq.