Izvorni znanstveni članak
Porosity evolution in aluminum alloy 2024 bop and butt defocused welding by Yb-YAG disk laser
Vittorio Alfieri
orcid.org/0000-0001-5868-6859
; Dept. of Industrial Engineering, University of Salerno, Fisciano, Italy
Francesco Cardaropoli
; Dept. of Industrial Engineering, University of Salerno, Fisciano, Italy
Fabrizia Caiazzo
; Dept. of Industrial Engineering, University of Salerno, Fisciano, Italy
Vincenzo Sergi
; Dept. of Industrial Engineering, University of Salerno, Fisciano, Italy
Sažetak
In many industrial applications, in order to obtain good results in laser welding processes, it may not be sufficient to use a focused beam on the upper surface, so a defocused beam is required instead. This study aims to investigate which advantages a defocused beam may offer in welding aluminum alloy 2024 using Yb:YAG disk laser. A characterization of laser beam geometry is preliminary necessary, in order to correlate bead features and effective specific energy provided. Porosity content decrease and enhanced penetration depth have been obtained with defocused beam; welding behavior has been related to magnesium loss via EDS analysis. Considering the shape of the cross sections of the bead in butt welding, the relation between key-hole instability and porosity formation has also been discussed. For the alloy in exam, the welding range to perform structurally sound and defect-free welds is found to be tight.
Ključne riječi
laser welding; aluminum alloy; defocusing; porosity; disk laser
Hrčak ID:
74933
URI
Datum izdavanja:
12.12.2011.
Posjeta: 1.108 *