Study on Characteristics of Weld Defect and its Prevention in Electron Beam Welding (Report IV) : Relationship between Weld Defect and its Formation Phenomenon

概要

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By the results obtained from penetrating phenomenon observed by X-ray occurred from the beam holes during electron beam welding, strong and weak waves of beam flow generated in beam holes occurred periodically, and this phenomenon was proved to be completely in accordance with spiking phenomenon. The solidification pattern formed by segregation when welding condition was changed using insert metal was observed. From the results obtained from the abovementioned observation, it was proved that in welding in beam active zone with iron-based alloy, irregularity points are easily formed in molten pool, and also voids are easily formed at the abovementioned part. Following the observation results of such weld phenomenon, we concluded that this behavior of fluidity in molten pool and the movement of beam flow are closely related and also defect is formed by the interaction between these two.
大阪大学の論文