Dynamic Analysis of Welding Phenomena in High Power Electron Beam Welding

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[I] 5OOkV Ultra High Energy Density Electron Beam Welding1) High power electron beam of 10 - l40kW was generated successfully. Electron beam of a power of l40kW was extracted to a high vacuum welding chamber and was focused to a diameter of 1mm. Ultra high energy density electron beam of 17000kW/cm^2 was obtained.2) For one pass bead-on-plate welding at flat position with up to l40kW beam, good welding results of a penetration depth of over 200mm were obtained for very thick stainless steel plates. The dynamic behavior of molten metal was observed with video camera at 60 frames per second under various welding conditions.[II] 30kW Tandem Electron Beam Welding1) The molten metal flow inside specimen during electron beam welding was visualized and dynamically observed with transmission X-ray and small tungsten particle tracer.2) The molten metal flow under various welding conditions were observed for 30kW class Tandem Electron Beam welder. When the penetration depth was shallow, the molten metal moved along whole molten pool, while the penetration depth was deep, . the molten metal did not flow along whole molten pool.3) The molten metal flow along whole molten pool was generated by Tandem Electron Beam which changed the distribution of heat input, and the titanium filler material was uniformly mixed to the root of the bead.