Tensile fracture behavior in CO2 laser beam welds of 7075-T6 aluminum alloy

Mechanical characterization of CO2 laser beam butt welds of AA5083

“…This is due to the very fine solidification structure caused by the steeper temperature gradient, especially close to the interface with the base metal [5]. Such effect is much more evident for higher welding speeds when a faster cooling rate takes place in the weld metal, resulting in a finer structure [6]. This hardening is less evident along the weld axis.…”

Mixed mode fatigue crack initiation and growth in a CT specimen repaired by stop hole technique

“…The aim of these methods is to extend the fatigue lives of cracked structural components that cannot be replaced as soon as the cracks are observed; this situation commonly happens when the replacement of new parts are time consuming and costly. Various methods for crack growth retardation have been proposed by researchers [1], for example, crack filling [2][3][4], application of the composite or metal patches on the cracked area, welding repair [5][6][7], and applying the residual compressive stresses.…”

Rheological behavior of Al-Mg-Si-Cu alloys in the mushy state obtained by partial remelting and partial solidification at high cooling rate

“…[1] Aluminum alloys of the 6000 series offer a good combination of strength and corrosion resistance [2] and are particularly suited for laser welding of aircraft panels, as compared to higher strength alloys such as 2000 and 7000 series, which show a high susceptibility to solidification defects. [3,4] However, defects such as porosity and hot tearing in the fusion zone, presence of liquation grain boundaries in the vicinity of the fusion zone, [5,6] and poor corrosion resistance [7] can limit their applications. [8][9][10][11][12] Hot tears are defects that occur at the very end of the solidification in processes such as casting [13] or welding.…”