Porosity Reduction of Aluminum Alloy in Electron Beam Welding with Pulse Control

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.