Tandem Electron Beam Welding (Report V)(Welding Physics, Processes & Instruments)

概要

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The role of the second electron beam in Tandem Electron Beam Welding was studied. The second beams of various power against the first beam power of 3, 6 and 9kW were impinged into the beam hole of the first beam with a very small crossing angle (〜8°). Bead crosssections of each case were analysed for root porosities, fluctuations of penetration depth and root radii. In each case, there was an optimum power of the second beam, and the optimum power ratio of these two beams was about 10%. In order to clearify the reason of the optimum power ratio, the welding process was observed dynamically by Transmission X-ray method. High speed movie films were analysed for the depth, width and shape of beam hole. It was found that the shape and stability of the beam hole changed with the power of the second beam, and the most stable beam hole was achieved with the above power ratio.
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