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1 问题的提出 按GB 3323—87标准用外透法或双壁单影法透照环焊缝时,一次透照长度L_3的计算方法是用整圈环焊缝的周长除以最少透照次数N求得。一般射线技术中有关外透法或双壁单影法最少透照次数N都是用N=180°/α公式介绍。如果用公式L_3=(π·D)/N就是等分透照长度。在射线技术管理和拍片过程中情况不全一样,我厂环缝射线探伤的圆筒容器在直径φ505～2400mm,厚度6～30mm之间变化的有近20多种。如果都是用N=180°/α和L_3=(π·D)/N公式确定一次透照长度,那么各种圆筒工件有不同的L_3,这样给射线探伤技术管理和拍片工作增加麻烦,往往容易搞错。
1 The question put forward according to GB 3323-87 standard with a transparent method or double-wall single method of penetration Girth weld, a transillumination length L_3 calculation method is to use the entire circumference of the girth weld divided by the minimum transillumination N times the number obtained. General ray technology on the outer or double-walled single method at least the number of transillumination N are used N = 180 ° / α formula is introduced. If using the formula L_3 = (π · D) / N is the equivalent transillumination length. In the ray technology management and filming process, the situation is not the same, our factory circular seam ray detection of cylindrical containers in diameter φ505 ~ 2400mm, thickness 6 ~ 30mm change between nearly 20 kinds. If all the length of transillumination is determined by the formula of N = 180 ° / α and L_3 = (π · D) / N, then all kinds of cylindrical workpieces have different L_3, which adds trouble to the management of radiography and filming work, Often easy to make mistakes.