ASTM E446 PDF

You are on page 1of 3 Search inside document ASTM E Significance and Use Graded reference radiographs are intended to provide a guide enabling recognition of specific casting discontinuity types and relative severity levels that may be encountered during typical fabrication processes. Reference radiographs containing ungraded discontinuities are provided as a guide for recognition of a specific casting discontinuity type where severity levels are not needed. These reference radiographs are intended as a basis from which manufacturers and purchasers may, by mutual agreement, select particular discontinuity classes to serve as standards representing minimum levels of acceptability see Sections 6 and 7. Reference radiographs represented by this standard may be used, as agreed upon in a purchaser supplier agreement, for energy levels, thicknesses or both outside the range of this standard when determined applicable for the casting service application. Severity levels of similar discontinuity categories and energy level range of E reference radiographs may alternatively be used, as determined appropriate for the casting service application, if so agreed upon in the purchaser supplier agreement see Note 2 and 5.

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You are on page 1of 3 Search inside document ASTM E Significance and Use Graded reference radiographs are intended to provide a guide enabling recognition of specific casting discontinuity types and relative severity levels that may be encountered during typical fabrication processes. Reference radiographs containing ungraded discontinuities are provided as a guide for recognition of a specific casting discontinuity type where severity levels are not needed. These reference radiographs are intended as a basis from which manufacturers and purchasers may, by mutual agreement, select particular discontinuity classes to serve as standards representing minimum levels of acceptability see Sections 6 and 7.

Reference radiographs represented by this standard may be used, as agreed upon in a purchaser supplier agreement, for energy levels, thicknesses or both outside the range of this standard when determined applicable for the casting service application.

Severity levels of similar discontinuity categories and energy level range of E reference radiographs may alternatively be used, as determined appropriate for the casting service application, if so agreed upon in the purchaser supplier agreement see Note 2 and 5. Procedures for evaluation of production radiographs using applicable reference radiographs of this standard are prescribed in Section 8; however, there may be manufacturingpurchaser issues involving specific casting service applications where it may be appropriate to modify or alter such requirements.

Where such modifications may be appropriate for the casting application, all such changes shall be specifically called-out in the purchaser supplier agreement or contractual document.

Section 9 addresses purchaser supplier requisites for where weld repairs may be required. Scope 1. The reference radiograph films are an adjunct to this standard and must be purchased separately from ASTM International, if needed see 2. Categories and severity levels for each discontinuity type represented by these reference radiographs are described in 1. Note 1The basis of application for these reference radiographs requires a prior purchaser supplier agreement of radiographic examination attributes and classification criterion as described in Sections 4, 6, and 7 of this standard.

Note 2Reference radiographs previously used for this thickness range carried the designation E71, but included a now rarely used gamma source, that is, radium. The current document is also updated by inclusion of several recognized shrinkage or C categories and by elimination of the crack and hot tear categories except for one example of each of these discontinuity types. Reference radiographs for thicker sections may be found in Reference Radiograph standards E and E Reference Radiograph standards E and E provide some overlap of severity levels for similar discontinuity categories within the same energy level range see 4.

Unless otherwise specified in a purchaser supplier agreement see 1. Each volume consists of six categories of graded discontinuities of increasing severity level and four categories of ungraded discontinuities.

Following is a list of discontinuity categories, types and severity levels for the adjunct reference radiographs of this standard: 1. Note 4Although Category GMottling is listed for all three volumes, the appearance of mottling is dependent on the level of radiation energy.

SI values are shown for information only. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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ASTM E446 REQ

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. The current document is also updated by inclusion NOTE 3—Although Category G—Mottling is listed for all three volumes, of several recognized shrinkage or C categories and by elimination of the the appearance of mottling is dependent on the level of radiation energy. Reference radiographs for thicker sections may be the higher radiation energy levels mottling may not be apparent in Volume found in E and E Each set is safety concerns, if any, associated with its use. It is the for comparison only with radiographs produced with equiva- responsibility of the user of this standard to establish appro- lent radiation.

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ASTM E446:15

Want this as a site license? Changes from the previous issue A redline edition is available for this document, with all changes visible. Ask Document Center Inc. Scope 1.

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The reference radiograph films are an adjunct to this standard and must be purchased separately from ASTM International, if needed see 2. Categories and severity levels for each discontinuity type represented by these reference radiographs are described in 1. Note 1—The basis of application for these reference radiographs requires a prior purchaser supplier agreement of radiographic examination attributes and classification criterion as described in Sections 4, 6, and 7 of this standard. Note 2—Reference radiographs previously used for this thickness range carried the designation E71, but included a now rarely used gamma source, that is, radium. The current document is also updated by inclusion of several recognized shrinkage or C categories and by elimination of the crack and hot tear categories except for one example of each of these discontinuity types. Reference radiographs for thicker sections may be found in Reference Radiograph standards E and E

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More E Scope 1. They are intended to provide the following: 1. At the same time, the standards so established may be unambiguously identified by alphabetic defect category or type designation and severity level. Note 1-Reference radiographs previously used for this thickness range carried the designation E71, but included a now rarely used gamma source, that is, radium. The current document is also updated by inclusion of several recognized shrinkage or C categories and by elimination of the crack and hot tear categories except for one example of each of these discontinuity types. Reference radiographs for thicker sections may be found in E and E

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