Abstract
With utilization of the theoretical epuation which shows the penetration depth in electron-beam welding, the theoretical equation for the general estimation of optimum weld heat input is induced for the specimens of which thickness and material are known, when there are welded by I-shape butt type and single pass method. Moreover the experimental equation for the estimation of ptimum weld heat input is made by rearranging a number of the actual optimum weld heat input which have been obtained in Sciaky Co. Ltd., U. S. A. and in N. R. I. M., Japan.After the theoretical and experimental equations are compared and discussed, the equation for the general estimation of optimum weld heat input is decided respectably.Therefore, when the thickness and material of specimens are known before welding, with utili-zation of the above equation, the accurate estimation for optimum weld heat input which gives the fully penetrated bead by single pass for I-shape butt type joint is become possible hereafter.
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