BROWSE

Related Researcher

Author's Photo

Ki, Hyungson
Laser Processing & Multiphysics Systems Laboratory
Research Interests
  • Laser materials processing
  • Laser material interaction

ITEM VIEW & DOWNLOAD

A study of keyhole geometry in laser welding of zinc-coated and uncoated steels using a coaxial observation method

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
A study of keyhole geometry in laser welding of zinc-coated and uncoated steels using a coaxial observation method
Author
Kim, JaehunOh, SehyeokKi, Hyungson
Issue Date
2015-11
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, v.225, pp.451 - 462
Abstract
Experiments were conducted over a large process parameter space using a 2 kW multi-mode fiber laser, and the effect of zinc-coating on the keyhole geometry was investigated using a high-speed coaxial video camera. From the top and bottom coaxial surface images of erratic keyhole motions that were obtained from separately conducted experiments, time-averaged keyhole structures were calculated using a physics-based semi-statistical frame analysis. For uncoated steel, the keyhole bottom aperture is located mostly within the laser beam area. In this case, because there is no zinc evaporation, the bottom aperture tends to be closed to absorb enough laser energy for sustaining a keyhole. For zinc-coated steel, the keyhole is mostly open at the bottom, and the front keyhole wall is tilted so that the laser beam is located on the front keyhole wall. The keyhole tilting angle is more important for zinc-coated steel and the beam interaction area is more relevant to uncoated steel.
URI
https://scholarworks.unist.ac.kr/handle/201301/12621
URL
http://www.sciencedirect.com/science/article/pii/S092401361530039X
DOI
10.1016/j.jmatprotec.2015.06.029
ISSN
0924-0136
Appears in Collections:
MEN_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU