Energy Density in Cavity during Electron Beam Welding

概要

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It is extremely difficult to know the energy density and its distribution in a beam hole during electron beam welding and no investigation has ever been made. This report concerns the proposition of the method and the apparatus made as a trial to investigate them. It proves that the electron beam which penetrates the test piece, forms the beam hole and passes through it has rather higher energy density than the original beam as the result under ordinary condition. It changes according as plate thickness. This fact also proves the "wall focussing effect". Furthermore, it is clarified that the energy density distribution of electron beam varies in both value and shape even under the same condition of welding and it depends upon various factors of power source of electron beam and structure of electron gun.
大阪大学の論文