射线检验程序(5)

射线检验程序

Radiographs shall have 25mm overlap to ensure that no portion of the joint remains unexamined. There should be a specific lead marker visible on both radiographs in the area of overlap.

胶片至少应有25毫米的搭接量，以确保焊缝进行了全部检验。在两张搭接片子上，在搭接部位应有一个特定的铅字。

6.2.4 SCREENS屏蔽

Lead intensifying screens shall be used. The front screen thickness shall normally be 0.03mm and the rear screen will normally be 0.03mm.

应采用铅质增感屏，前后增感屏的厚度一般均为0.03毫米。

Screens shall be examined on a regular basis for dirt or blemishes that may transfer onto the film, thus causing confusion with, and masking of, defect images.

定期检查增感屏，以确保没有灰尘或损坏等可能导致产生缺陷片子的情况。

6.2.5 FILM TO BE USED 所用胶片

The film to be used are KODAK MX125, AA400 or equal quality

所用胶片为柯达MX125, AA400 或同等质量的胶片

6.2.6 IMAGE QUALITY INDICATORS像质计

ASME Type ASME 类型

The IQI provides a guide to the quality of radiographs produced and shall be chosen in strict compliance with ASTM E142.

像质计体现了所拍胶片的质量，所以应当严格按照ASTM E142进行选择。

Source Side Penetrameter(s). 像质计置于源侧

The penetrameter(s) shall be placed on the source side of the part being examined, except in the condition described below.

除了下述情况外，像质计应当放置在被检工件的源侧。

Film Side Penetrameter(s). 像质计置于胶片侧

Where inaccessibility prevents hand placing the penetrameter(s) on the source side it shall be place on the film side in contract with the part being examined. A lead letter 'F' at least as high as the penetrameter identification number(s) shall be placed adjacent to