The invention relates to a detection method for a multilayered cylinder. A quantitative detection method for corroded holes of the multilayered cylinder comprises the steps of preparing a test block referring to the material and thickness of a material object, and making defects of butterfly-shaped pits of different diameters and depths and through holes inside the test block; transilluminating the test block prepared in the above step by using Ir192 gamma-ray and X-ray separately, wherein the performance standard is JB/T4730 'nondestructive testing of pressure equipment', and the quality of negative film is equal to or higher than grade A, and determining transillumination technological parameters of the rays adopted according to test results; and determining quantitative evaluation criteria for the defects; detecting the to-be-detected object firstly by using the Ir192 gamma-ray to determine the position of a defect, and then detecting the to-be-detected object by adopting the determined transillumination technological parameters by using the X-ray, and quantitatively determining the layer number of a laminate where the defects reach by using the quantitative evaluation criteria for the defects. According to the method, the layer number of the laminate that a corroded hole has developed to can be determined quantitatively and accurately.

 

　　

　　本發明涉及多層筒體檢測方法。一種多層筒體腐蝕孔洞類缺陷的定量檢測方法，它包括下列步驟，參照實物的材質和厚度制作試塊，內部制造不同直徑和深度的蝶形凹坑和貫穿孔缺陷；分別用Ir192γ射線和X射線對步驟一制作得試塊進行透照，執行標準JB/T4730《承壓設備無損檢測》，底片質量A級以上，根據試驗結果確認所采用的射線的透照工藝參數；確定缺陷定量評判標準，先用Ir192γ射線，采用確定的透照工藝參數對待測物進行檢測，初步確定待測物缺陷位置；再用χ射線，采用確定的透照工藝參數對待測物進行檢測，并利用缺陷定量評判標準定量判定缺陷達到層板的層數。本發明能定量準確判斷腐蝕孔洞發展到第幾層層板。