ASTM E 1742 PDF

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. Referenced Documents 2. The requirements expressed in this practice are intended to control the quality of the radiographic images and are not intended to establish acceptance criteria for parts and materials.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. Referenced Documents 2. The requirements expressed in this practice are intended to control the quality of the radiographic images and are not intended to establish acceptance criteria for parts and materials.

These areas are identi? Current edition approved Oct. Published December Box , Miami, FL Nothing in this practice, however, supersedes applicable laws and regulations unless a speci? Terminology 3. In X-ray radiography, energy machine rating is determined by kilovolts kV , million electronvolts MeV. In gamma ray radiography, energy is a characteristic of the source used.

A listing of common material groups is given in Practice E This practice is written so it can be speci? It is not a detailed how-to procedure to be used by the NDT facility and, therefore, must be supplemented by a detailed procedure see 6. General Practice 5. NCRP 51, NCRP 91 and NIST Handbook may be used as guides to ensure that radiographic procedures are performed so that personnel shall not receive a radiation dosage exceeding the maximum permitted by city, state, or national codes.

Box , Columbus, OH E and materials, shall be capable of producing uniform radiographs free of blemishes or artifacts, which might interfere with interpretation in the area of interest. Solution control shall be in accordance with 6. Guide E should be consulted for guidance on?

The suitability of these exposure parameters shall be demonstrated by attainment of the required radiographic quality level and compliance with all other requirements stipulated herein. In the event that light leaks into the? If the? Film holders and cassettes should be routinely examined for cracks or other defects to minimize the likelihood of light leaks.

Screens shall have the same area dimensions as the? Recommended screen thicknesses are listed in Table 1 for the applicable voltage range being used. Screens shall be free from any cracks, creases, scratches, or foreign material that could render undesirable nonrelevant images on the? Other thicknesses may be used provided the required radiographic quality level, contrast, and density are achieved.

B Prepackaged? Both types of prepackaged? C No back screen is required provided the back scatter requirements of 6. The speci? If wire IQIs are used, they shall be correlated to hole-type radiographic quality levels in accordance with Practice E For the radiography of electronic devices, Practice E shall be used.

This practice permits the use of either military or ASTM designs. Material groups and their designations are listed in Fig. For example, a specimen thickness of 3? Lead numbers and letters, or a material of similar radiographic opacity, shall be used for identi? For identi? When the material is a composite or does not have a predominant element, a controlled system for IQI identi? Circular IQI identi? See Fig. Details of the design, materials designation, and thickness identi?

Detail Requirements 6. When required by contract or purchase order, the procedure shall be submitted to the cognizant engineering organization for approval. The written procedure shall contain, as a minimum, the following information: 6. Included shall be the angle of the radiation beam in relation to the component, the source-to-?

This may be accomplished through drawings and tables or by reference to documents where such information is found. For radioisotope sources, the isotope type, source strength curies , exposure time, and source size.

If the examination procedures are similar for many components, a master written procedure may be used that covers the details common to a variety of components. All written procedures shall be approved by an individual quali? Complex components may be divided into zones and separate criteria assigned to each zone in accordance with its design requirements. When used, direct references to ASTM reference radiographic standards shall include the grade level for each type of discontinuity permitted for each part or zone.

Each radiograph shall also carry the identi? Radiographs of a repair area shall be identi? For explosives and propellants, the conditioning temperature shall be identi? Areas to be examined shall be identi? If the number of parts to be examined and the amount of coverage of each part is not speci? If not speci? Radiographic examination may be performed before heat treatment, provided liquid penetrant or magnetic particle examinations are performed after heat treatment. Prior approval of the detailed examination, evaluation, and quality control procedures shall be obtained from the Level III radiographer of the cognizant engineering organization see 5.

If the quality level is not speci? Unless otherwise speci? Where superimposed? Film densities above 4. For single-? Expressed as multiple thickness of IQI.

C Equivalent IQI sensitivity is that thickness of the IQI expressed as a percentage of the specimen thickness in which a 2T hole would be clearly visible under the same radiographic conditions. For double-wall exposures and double-wall viewing techniques, the IQI shall be based on the double-wall thickness of the component. The IQI thicknesses that are in between, or smaller than, the thickness increments in Fig.

For double-wall exposures and singlewall viewing techniques, the IQI shall be based on the single-wall thickness of the component.

In no case shall the IQI thickness be based on a thickness greater than the thickness to be radiographed. For fabrication welds the IQI shall be selected as speci? In such a case, a single IQI shall be placed upon the source side of a part at the outer edge of the cone of radiation or farthest extremity of the exposure setup that is, farthest from the radiation beam centerline.

For examination of irregular objects, the IQI shall be placed on the area of the part farthest from the? Where it is not practicable to place the IQI on the part, the separate block technique in 6.

The shim, block, or like section and IQI shall be placed on the outer edge of the cone of radiation. The shim, block, or like section shall exceed the IQI dimensions so that at least three sides of the IQI shall be visible on the radiograph. If required, the shim shall be placed on a low absorptive material such as polystyrene plastic or its equivalent to ensure that the IQI shall not be any closer to the?

If the required IQI on the source side 6 E indicates the speci? If the IQI on the inside indicates the required radiographic quality level, then the image of either the smallest IQI hole in the thinnest IQI, or the image of the smallest wire, visible on the?

As long as the radiographic technique is not changed, subsequent exposures may be performed without an IQI. A new quali? A copy of the quali? The shot may be a mixture of many diameters to provide a uniform density. Heavy chemical solutions used for masking may be toxic; the proper health and safety precautions and markings shall be used. At least one IQI per radiograph shall be used, except as speci?

The IQI thickness shall be based on the thinnest wall being radiographed and shall be placed on the thickest wall section. For T-joints, lap joints, corner joints,? If different size sections are joined, the IQI shall be based on the thinner wall section.

Backing strips or rings are not considered as a part of the weld, base material, or reinforcement bead thickness upon which the IQI is based. If subsequent machining reduces the thickness of the weld area of interest and follow-up NDT ultrasonic, liquid penetrant, or radiography is not required, IQI size selection shall be based on? If the required sensitivity cannot be obtained, radiographic examination shall be required after? When the weld is not radiographically similar or where part geometry precludes placement, the IQI wire or hole of the required sensitivity, as applicable, may be placed over the weld, but outside of the area of interest.

When weld-reinforcement weld bead , backing rings or strips are not removed, a shim of the same material group or radiographically similar material see 5. The long axis of the IQI shall be parallel with and at least 1? When double-wall techniques are used, either superimposed or elliptical offset projections may be used.

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ASTM E1742 PDF

Grolabar Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. E Practice for Calibration of Transmission Densitometers. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Download Now Defense manufacturing is xstm about project manufacturing and project accounting. E Standard Terminology for Nondestructive Examinations. No items in cart. These items should be addressed in the purchase order or the contract.

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Fenrigor These items should be addressed in the purchase order or the contract. The requirements expressed in this practice are intended to control the quality of the radiographic images and are not intended to establish acceptance criteria for parts and materials. It is the responsibility of the user of this standard f establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. No items in cart. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

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