Skip to the main content

Engineering Review : International journal for publishing of original researches from the aspect of structural analysis, materials and new technologies in the field of mechanical engineering, shipbuilding, fundamental engineering sciences, computer sciences, electrical engin, Vol. 31 No. 2, 2011.

Original scientific paper

Porosity evolution in aluminum alloy 2024 bop and butt defocused welding by Yb-YAG disk laser

Vittorio Alfieri orcid id 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

Full text: english pdf 16.040 Kb

page 125-132

downloads: 473

cite

Abstract

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.

Keywords

laser welding; aluminum alloy; defocusing; porosity; disk laser

Hrčak ID:

74933

URI

https://hrcak.srce.hr/74933

Publication date:

12.12.2011.

Visits: 1.496 *