Study on High Power Tandem Electron Beam Welding

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1. Development of high power Tandem Electron Beam welding apparatusMaximum power of the 1st beam: 30 kW (70 kV, 430 mA)Maximum power of the 2nd beam: 6 kW (60 kV, 100 mA)Crossing angle: 25 degrees2. Beam characteristics measured with high speed deflector and slit methodDiameter of the 1st beam: 2 mm; Energy density: 9.5 x <10^2> kW/ <cm^2>Diameter of the 2nd beam: 0.5 mm; Energy density: 7.6 x <10^2> kW/ <cm^2>3. Result obtained slit method and AB test shows good agreement.4. Application of TEB welding to thick SM41 steelA- and R- porosities were completely suppressed. Bead width was not enlarged by TEB welding.5. Application of TEB welding to high speed and high quality welding of SUS304 steelUp to 6 m/min, sound bead was obtained without any spatter, humping and undercut.6. Observation of beam hole behavior and molten metal flow were observed during welding. Suppression mechanism of porosity by TEB welding was clarified.7. Application of TEB welding to Aluminum dicastSound bead was obtained by only single pass TEB welding.