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Investigation of the Piercing Process in Laser Cutting of Stainless Steel
2017 (English)In: Journal of laser applications, Vol. 29, no 2Article in journal (Refereed) Published
Abstract [en]

This paper investigates the laser piercing process which precedes nearly every laser cutting operation. The two most important aspects of the piercing process are: a) How long does it take to pierce the material? And b) How wide is the pierced hole? If the hole is no wider than the cut line, the material can be pierced on the line to be cut. In this paper 10 mm thick stainless steel was pierced by a multikilowatt fibre laser to compare efficiency and quality when piercing with a continuous wave (cw) output and a selected range of power modulation parameters. The different processes were observed by high speed imaging and subsequently examined by visual observation. High speed imaging is used to time the penetration event and to study the laser-material interactions involved in drilling the pierced holes. The results show that appropriate laser power modulation settings can considerably reduce both the piercing time and the required energy to generate any piercing hole required for the subsequent cutting process. This pulse-pierce technique and the differences between piercing with a continuous and a power modulated laser beam are further explained and discussed. Also the effect on the size of the entrance to the pierced hole depending on power modulation regimes was investigated in this paper.

Place, publisher, year, edition, pages
2017. Vol. 29, no 2
Keyword [en]
Laser cutting, laser piercing, efficiency, fibre laser, high speed imaging
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:hv:diva-11762DOI: 10.2351/1.4983260OAI: oai:DiVA.org:hv-11762DiVA: diva2:1150952
Note

Validerad; 2017; NivÄ 2; 2017-05-17 (andbra)

Available from: 2017-10-20 Created: 2017-10-20 Last updated: 2017-10-23Bibliographically approved

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