The electron beam welding with pulse control is mentioned as one of the possibilities that the scope of electron beam welding will be expandable. However, while the electron beam welding of pulse control can generally control a heat input as compared with the electron beam welding of continuous irradiation, it is known especially in welding of an aluminium alloy that generating of porosity is remarkable. In this paper, we carry out a pulsed electron beam welding to which a beam spot position is moved with doing one pulse irradiation of the electron beam, and also examine the effect which the amount of beam spot movements exerts on the number of porosity. As a result, it turned out that the number of porosity is reduced with the increase in the amount of beam spot movements.
In-plane tensile and through-thickness compressive stress-strain characteristics of Al alloy 2024-T3 and its butt welds produced by the friction stir welding (FSW) proocess are studied. FS welded AA2024-T3 butt joints are produced under a fixed set of appropriate welding conditions. Micro-hardness tests are performed to examine the microstructural change occurring during the FSW process. In-plane tensile and through-thickness compressive tests on the base material and the FS weld are carried out with an Instron testing machine. Flat tension specimens are machined perpendicular to the weld line of the FS weld. Cylindrecal compression specimens are machined along the thickness direction of the base material, heat-affected zones and nugget regions in the FS weld. Constitutive modeling of the in-plane tensile and through-thickness compressive stress-strain behavior is conducted using a rare-independent Ramberg-Osgood equation. It is shown that their tensile and compressive stress-strain behavior can be well described by the Ramberg-Osgood constitutive equation.