Air boring and nonvacuum electron beam welding with a plasma windowa)
Air boring and nonvacuum electron beam welding with a plasma windowa)
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DOI：
10.1063/1.1863232
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发表时间：
2004-11
影响因子：
2.2
通讯作者：
A. Hershcovitch;Acceleron Team
中科院分区：
文献类型：
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作者：
A. Hershcovitch;Acceleron Team
等离子体窗是一种利用稳定的等离子体电弧作为真空与大气或无固体材料的加压目标之间的界面的新型装置。此外，等离子体对带电粒子有透镜效应。该特性使光束聚焦到非常小的光斑尺寸，并克服了由于大气原子和分子散射引起的光束色散。最近，等离子体窗口与传统的电子束焊机相匹配。利用前所未有的低功率、低能量电子束实现了大气中电子束焊接。在不使用氦气的情况下，非真空等离子体窗口电子束焊接的焊接质量接近真空电子束焊接的焊接质量。焊缝宽度与隔离距离无关，最大可达5cm，这与目视观察表明，6-25mA、90-150KeV的电子束可能已经实现了束束压缩传播。这或许可以解释为什么焊接效果好于预期。相比之下……
The plasma window is a novel apparatus that utilizes a stabilized plasma arc as interface between vacuum and atmosphere or pressurized targets without solid material. Additionally, the plasma has a lensing effect on charged particles. This feature enables beam focusing to very small spot sizes and overcoming beam dispersion due to scattering by atmospheric atoms and molecules. Recently, the plasma window was mated to a conventional electron beam welder. And, electron beam welding in atmosphere was accomplished with electron beams of unprecedented low power and energy. Weld quality for the nonvacuum plasma window electron beam welding approached the quality of in-vacuum electron beam welding, without the use of helium as process gas. Weld widths were independent of stand-off distance for up to 5cm, which along with visual observations suggest that pinched beam propagation might have been achieved with 6–25mA, 90–150KeV electron beams. That may explain the better than expected welding results. By comparison...