6TH International Congress on Technology - Engineering - Kuala Lumpur3 - Malaysia (2018-07-19)

Melt Surface Deformation During Stainless Steel Laser Cutting In Vacuum And Atmospheric Pressure

A theoretical analysis of the recoil pressure in the interaction zone during stainless steel laser cutting is carried out. We investigate the threshold temperature at which the molten surface starts to be deformed and we evaluate the corresponding melt expulsion velocity in vacuum and at atmospheric pressure. We demonstrate that the recoil pressure contributes weakly to the lateral ejection of the molten material if the surface temperature is equal or is lower than that of the vaporization one at atmospheric pressure. This recoil pressure can play a signi?cant role in ejection of the melt only for surface temperatures which are very higher than the boiling point, this conclusion is not valid in vacuum. It is also shown that by balancing surface tension and recoil pressure, the initiation of liquid metal ejection can be determined.
Samia Aggoune