射线检验程序(9)

射线检验程序

RT shall be performed in accordance with AWS D1.1

RT 检验应按AWS D1.1进行

A single wall exposure technique shall be used for radiography whenever possible. Where it is not practical to use a single wall technique, a double wall technique shall be used.

在可能的情况下，应当采用单壁透照技术。当不能采用单壁透照时，可以采用双壁透照。 Single Wall Technique 单壁透照技术

In the single wall technique, the radiation passes through only one wall of the weld (material), which is viewed for acceptance on the radiograph. An adequate number of exposures shall be made to demonstrate that the required coverage has been obtained.

在可能的情况下，应当采用单壁透照技术。当不能采用单壁透照时，可以采用双壁透照。 Note: Figures 1 and 2, illustrate the single wall exposure set-ups that may be used.

注：图1给出了可接受透照技术，图2给出了典型透照技术。

Double Wall Technique双壁透照

When it is not practical to use a single wall technique, one of the following double wall techniques shall be used.

当不能采用单壁透照时，可以采用下述的双壁透照方式。

Single Wall Viewing单壁单影

For materials and for weld components, a technique will be used in which the radiation passes through the two walls and only the weld (material) on the film side wall is viewed for acceptance. An adequate number of exposures shall be made to demonstrate that the required coverage has been obtained.

单壁单影透照是射线穿过双壁的材料，但仅在放胶片处的焊缝面成像的方法。应当进行足够次数的透照，以保证能够覆盖所要求的检验范围。

Where complete coverage is required for circumferential welds (materials), a minimum of three exposures taken 120° to each other shall be made.

当要求对环焊缝（母材）全部透照时，最少应每隔120度，分三次进行透照。

Double Wall Viewing双壁双影

For materials and for welds in components 3 1/2" (90mm) or less in nominal outside diameter, a technique will be used in which the radiation passes through two walls and the weld (material) in both walls is viewed for acceptance on the same radiograph. For double wall viewing only, a source side penetrameter shall be used. Care will be exercised to