Synchronized multi-spot scanning strategies for the laser powder bed fusion process

Chun Yu Tsai, Chung Wei Cheng, An Chen Lee, Mi Ching Tsai

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The laser powder bed fusion (LPBF) process can produce parts with complex internal geometries that cannot be easily manufactured using a material removal process. However, owing to the different heat transfer efficiencies of a laser melting process, the optimal process parameters are limited to a small range. This study used galvanometric scanner technology and a diffractive optical element (DOE) to build an experimental multi-spot LPBF system. Adjustable characteristics were the angle and the lateral distance between spots. An adjustable multi-spot method was used to modulate the temperature field on the powder bed and enhance the processing quality and throughput. The results from the synchronized three-spot method using different scanning strategies improved the layer surface roughness Ra by 3.2 μm. Moreover, the scanning time was decreased by 38.1% of the single-spot method.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalAdditive Manufacturing
Publication statusPublished - 2019 May

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Materials Science(all)
  • Engineering (miscellaneous)
  • Industrial and Manufacturing Engineering


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