环缝偏心内照法N,和L_(eff)参数计算式的探讨

DISCUSSION ON THE CALCULATION OF THE PARAMETERS N, L3 AND L_(eff) FOR RADIOGRAPHIC INSPECTION OF CIRCUMFERENTIAL WELDS WITH SOURCE INSIDE BY OFF-CENTRE METHOD

对环缝偏心内照法的 N,L3?和 Leff参数计算式进行讨论 ,提出射线束半辐射角 2 0°的定向 X射线机对环缝内照的 N,L3?和 Leff参数计算式。

A discussion was carried out on the calculation of the parameters N, L 3 ( and L eff for radiographic inspection of circumferential butt welds with source inside by off centre method. The related formulas suitable for normal X ray sets were proposed.