Laser Cutting Mild Steel With Nitrogen

Using nitrogen provides the most benefit when you are cutting very thin material.

Laser cutting mild steel with nitrogen.

When carbon steel is cut with an oxygen assist gas the oxygen interacts with the hot metal to create an exothermic reaction which adds heat. Also if your cutting mild steel that has mill scale. If the steel is thicker than 1 8 in cutting speed is similar for both nitrogen and oxygen. Cut the same sheet with oxygen assist gas and you get a rougher edge that needs clean up but thanks to the additional heat produced you can cut much faster.

When using nitrogen an inert gas the cutting process relies solely on the beam s energy to melt the metal. Speed at times is reduced for a clean cut by 20. Factory cut chart settings. At our shop we nitrogen cut 7ga p o at speeds of about 70 80ipm on ext and around 60ipm on internal.

Meeting your nitrogen purity challenges the nitrogen purity is important if a clean cut edge is required for example when cutting stainless steel or aluminium metals. For mild steel and stainless steel thick sheets the ideal pressure lies in the region between 10 and 15 bar. On amada fo3015 nt and 4020nt lasers. Nitrogen laser cutting is suitable for shaping mild steel although other factors affect the decision.

The examples of the adjustments made will be similar for any co2 or fiber laser cutting mild steel with o2. However there are two choices when cutting mild steel. The following show 12 6 and 3 2 mm 1 2 1 4 and 10ga mild steel cut with oxygen on a 2kw fiber laser and examples of the same part cut with 1 variable changed to show how it affected the cut quality. Why laser cutting steel with nitrogen.

Higher figures are possible with the most powerful lasers available. When cutting thin gauge material there s not much need for additional speed. We have found how fast you can push depends on the material when we get higher carbon material. When cutting stainless steel or carbon steel with nitrogen the laser melts the steel and the nitrogen assist gas evacuates the molten material leaving an oxide free edge.

With nitrogen as an assist gas can you advise starting settings pressure power and speed. I have a 160 w chinese laser that i would like to cut mainly 1 2 mm mild steel 1 2 mm stainless steel and up to 1 6 mm hr steel. If you are cutting stainless steel or aluminium this is usually only cut with nitrogen or compressed air compressed air is typically used to laser cut material up to 2mm thick. Laser cutting mild steel with nitrogen.

Nitrogen or oxygen can be used as the assist gas.