Study on High Power Tandem Electron Beam Welding

1.大功率串联电子束焊机研制第一束最大功率：30kW(70千伏，430 mA)第二束最大功率：6千瓦(60千伏，100 mA)交叉角度：25度用高速偏转器和狭缝法测量光束特性第一光束直径：2 mm；能量密度：9.5x&lt；10^2&gt；kW/&lt；cm^2&gt；第二光束直径：0.5 mm；能量密度：7.6x&lt；10^2&gt；kW/&lt；cm^2&gt；3.狭缝测量结果与AB检验结果吻合较好。厚板SM41钢采用TEB焊，A型气孔和R型气孔被完全抑制。TEB焊对焊道宽度影响不大。TEB焊在SUS304钢高速高质量焊接中的应用速度高达6m/min时，焊缝质量良好，无飞溅、驼峰和起毛现象。观察了焊接过程中的束孔行为和熔体流动情况。阐明了TEB焊抑制气孔的机理。采用单道TEB焊获得了纯铝铸件焊道的TEB焊应用。

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.