Magnesium alloys are increasingly widespread in different industries such as automotive, electronic, etc. The wider use of these alloys may come with a reliable method of components joining. In this paper, the laser welding process using Nd:YAG laser of maximum power 2 kW has been investigated and reported. The effect of processing parameters including laser power and welding speed has been explored. Sheets with 1 mm thickness of a AZ31B magnesium alloy have been butt-welded with helium and argon used as shielding gas without filler material. Mechanical properties have been measured by means of uniaxial tensile tests using a Digital Image Correlation (DIC) technique for the strain measurement. After a preliminary experimental plan aimed at exploring the process parameters range, the welding process has been optimized using a Design of Experiment approach. Subsequent experimental plans have led to optimized butt joints that have showed, after tensile test, a sound weld bead with the fracture occurrence in the base material. The local strain analysis by DIC highlighted a different tensile behaviour, in terms of welding bead deformation, in optimized laser butt welded joints compared to the not optimized one.
|Titolo:||Saldatura con laser Nd:YAG di giunti di testa di lamiere sottili in lega di magnesio AZ31|
|Data di pubblicazione:||2011|
|Appare nelle tipologie:||1.2 Recensione in rivista|