Authors
Shashank Sharma, SA Ramakrishna, J Ramkumar
Publication date
2020/1/1
Journal
Procedia CIRP
Volume
95
Pages
944-949
Publisher
Elsevier
Description
Laser material processing at micro-meter domain can be used for a plethora of applications such as micro drilling, micro welding, micro cutting, micro-texturing as well as micro polishing. In laser micro-cutting, welding and drilling, a high power laser (Intensity ~1010 W/m2) is used to melt and vaporize the material to produce high penetration welds, kerf cuts, and high aspect ratio micro holes. Whereas, in the case of laser texturing, conduction mode welding and polishing, the laser power density is sufficiently low to allow only melting of the material. With the irradiance of high-intensity laser, generation of highly dynamic melt pool occurs due to the presence of vaporization induced recoil pressure, Young Laplace surface tension force, and thermo-capillary shear stress. The melt pool convection results in geometrical defects such as recast layer, porosity, spatter formation, humping, protuberances and melt ripples …
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