TY - JOUR
T1 - High surface quality welding of aluminum using adjustable ring-mode fiber laser
AU - Maina, Martin Ruthandi
AU - Okamoto, Yasuhiro
AU - Okada, Akira
AU - Närhi, Matti
AU - Kangastupa, Jarno
AU - Vihinen, Jorma
N1 - Funding Information:
This research work was partly supported by Japanese Ministry of Education, Culture, Sports, Science and Technology , and Jomo Kenyatta University of Agriculture and Technology, Kenya .
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/8
Y1 - 2018/8
N2 - A method to improve penetration and stabilize the welding phenomenon at a high welding speed has been described through experimental and numerical investigations. Using a high power laser beam consisting of a center and a ring part, influences of shielding gas direction and flow rate, laser power density, and welding mode defined by variable intensity distribution have been clarified. The weld bead was evaluated in terms of width, height, shape and roughness. Dual-mode laser irradiation of center and ring power made it possible to stabilize the welding process. The center power helps to achieve sufficient deep penetration, while ring power ensures good temperature distribution. Good surface quality and deep penetration welding could be achieved with dual-mode welding, using low flow rate of shielding gas supplied from the backside direction.
AB - A method to improve penetration and stabilize the welding phenomenon at a high welding speed has been described through experimental and numerical investigations. Using a high power laser beam consisting of a center and a ring part, influences of shielding gas direction and flow rate, laser power density, and welding mode defined by variable intensity distribution have been clarified. The weld bead was evaluated in terms of width, height, shape and roughness. Dual-mode laser irradiation of center and ring power made it possible to stabilize the welding process. The center power helps to achieve sufficient deep penetration, while ring power ensures good temperature distribution. Good surface quality and deep penetration welding could be achieved with dual-mode welding, using low flow rate of shielding gas supplied from the backside direction.
KW - Adjustable ring-mode fiber laser
KW - Aluminum
KW - Laser welding
KW - Shielding gas
KW - Surface quality
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U2 - 10.1016/j.jmatprotec.2018.03.030
DO - 10.1016/j.jmatprotec.2018.03.030
M3 - Article
AN - SCOPUS:85044959061
VL - 258
SP - 180
EP - 188
JO - Journal of Materials Processing Technology
JF - Journal of Materials Processing Technology
SN - 0924-0136
ER -