Effect of laser pulse overlap on machined depth

Tiffany A. Davis, Jian Cao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

This paper studies the effect of laser pulse overlap on machined geometry. A model was created to predict the laser machined geometry based on baseline data and the exact placement of laser pulses. Pulse overlap was varied and the predicted geometry was examined. To validate the model, experimental channels were created on D2 steel with an Nd:YVO4 picosecond laser at a wavelength of 532 nm. Step height and surface roughness values were studied for each channel. Good correlation was found for pulse overlap up to 75%, after which heat accumulation and deposition effects became more dominant. SEM images were taken of the channel cross sections to observe melt zones. The results indicate that pulse overlap of 75% provides a relatively smooth surface finish with minimal heat and redeposition effects. A second comparison between experimental and simulated geometry was completed on silicon to assess the model's ability to predict geometry for nonmetallic materials. Good agreement was found.

Original languageEnglish (US)
Title of host publicationTransactions of the North American Manufacturing Research Institution of SME 2010, NAMRI/SME
Pages291-298
Number of pages8
StatePublished - Nov 16 2010
Event38th Annual North American Manufacturing Research Conference, NAMRC 38 - Kingston, ON, Canada
Duration: May 25 2010May 28 2010

Publication series

NameTransactions of the North American Manufacturing Research Institution of SME
Volume38
ISSN (Print)1047-3025

Other

Other38th Annual North American Manufacturing Research Conference, NAMRC 38
CountryCanada
CityKingston, ON
Period5/25/105/28/10

Keywords

  • Micromachining
  • Picosecond laser
  • Surface texture

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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