1、MIL-R-45774A ND m 9999906 057b080 4 m 1 INCH-POUND I MIL-R-45774A (MI) 29 June 1992 SUPERSEDING MIL-R-45774 (Om) 28 June 1962 MILITARY SPECIFICATION RADIOGRAPHIC INSPECTION, SOUNDNESS REQUIREMENTS FOR FUSION WELDS IN ALUMINUM AND MAGNESIUM MISSILE COMPONENTS This specification is approved for use by
2、 the U.S. Army Missile Command, Department of the Army, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the methods for defining soundness and freedom from defects of manual or automatic shielded inert gas arc welds
3、 in aluminum and magnesium as determined by radiographic inspection. 2. APPLICABLE DOCUMENTS 2.1 Government documents. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, U.S. Army Missil
4、e Command, ATTN: AMSMI-RD-SE-TD- ST, Redstone Arsenal, AL 35898-5270 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMCC N/A AREA NDTI DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Lice
5、nsed by Information Handling ServicesMIL-R- 4 5 7 7 4A (MI 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in
6、 the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS MIL IT ARY MIL-R-11470 - Radiographic Inspection: Qualification of Equipment, Operators and Procedures STANDARDS MILITARY MIL-STD-453 - I
7、nspection, Radiographic (Unless otherwise indicated, copies of the federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Ave., Philadelphia, PA 19111-5094.) 2.2 Non-Government publications. The following docum
8、ents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the
9、issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM E 155 - Inspection of Aluminum and Magnesium Castings, Standard Reference Radiographs for ASTM E 505 - Inspection of Aluminum and Magnesium Die Casting, Standard Reference Radiographs
10、for (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These 2 Licensed by I
11、nformation Handling ServicesMIL-R-45774A ND m 9999906 057bO2 m MIL-R-4577 4A (MI) documents also may be available in or through libraries or other informational services. ) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text
12、 of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Type identification. Type radiographs of defects, which are part b of this specification, bear identification numbers t
13、o which references are b made in tables I and II. 3.2 Designation of standards. Tables I and II provide five standards for the soundness of welds, depicting gradations of soundness conditions. The designations of the standards shall be used in connection with the radiographic position charts to indi
14、cate the standard of soundness required in each area to be inspected radiographically. 3.3 Comparison of type radiographs. Radiographs of production welded units submitted for inspection shall be compared with the type radiographs forming part of the specification. The soundness condition represente
15、d by the type radiographs shall be considered: acceptable, borderline, or unacceptable, as indicated in tables I and II for the standard which is applicable to the area being inspected. a 3.4 Acceptance criteria. When a particular standard is called for at any location in a position chart, the defec
16、t indicated as unacceptable, as indicated in tables I and II, shall be grounds for rejecting the weldment. 3.4.1 Borderline. When fusion or linear porosity conditions are passable, but at the limit of acceptability as defined by rules 1 thru 7, inclusive (see 4.4) the defect shall be regarded as bor
17、derline for the purpose of this specification. 3.4.2 Acceptability. The following instructions shall apply in determining acceptability according to the standard where borderline conditions exist according to tables I and II, and where one or more types of defects are found in any weld. 3.4.2.1 Sing
18、le type of defects. When the production radiographs show but one typeof defect which is equal to or better than the borderline for the acceptable standard, the corresponding portion of the weldment shall be acceptable without repair. If the defects are larger or more numerous than indicated by the b
19、orderline for the standard, the weldment shall be rejected. 3 Licensed by Information Handling ServicesMIL-R-45774A ND m 9999906 0576083 T m MIL-R-45774A (MI) 3 2 a a C m c, tn T z m a c m ci VI =: 2 2 H m m u tn U H - 2 m a c m u VI H - a bILium acceDtable c onditions of linear Dorositv. 11 License
20、d by Information Handling ServicesMIL-R-45774A ND 9999906 0576073 9 9 MIL-R-45774A (MI) 4.4.5 Rule 5. Imperfect fusion and incomplete penetration defects occur when the molten weld metal fails to fuse due to oxide or other impurities, or when the molten metal fails to penetrate the full thickness of
21、 the sheet due to insufficient heat. These defects shall be graded according to rules 1 and 2 and figures 1 and 2. 4.4.5.1 Fillet welds. Acceptability limits for imperfect fusion at weld interface for standard III (see figure 3) fillet welds shall be in accordance with the referenced radiographs (se
22、e table I). Because of the difficulty in differentiating between incomplete penetration and imperfect fusion in fillet welds, either or both conditions shall be cause for rejection if in excess of the limits shown in the referenced radiographs. 4.4.5.2 Butt welds with back-up-strips. Acceptability l
23、imits for imperfect fusion at weld interface for standard III (see table IV) butt welds shall be in accordance with the referenced radiographs (see table I). 4.4.6 Rule 6 - Foreign materials. More dense inclusions in aluminum arc welds are usually present in the form of tungsten from the electrode (
24、TIG). Less dense inclusions are generally impurities resulting from poor cleaning, improper shielding gas mixture or pressures (see table I). 4.4.7 Rule 7 - Undercuttinq. Undercutting shall be cause for rejection if greater than of 0.10T in depth for any 1 inch weld length. Undercutting may be obser
25、ved on the radiographs but is measured by mechanical means (see table I). 4.5 Special rules applicable to use of back-up-strips. 4.5.1 Sheet thickness - determination. For purposes of determining acceptability limits of welds with back-up-strips, the thickness (T) shall be defined as the thickness o
26、f the thinner sheet being jointed. 4.5.2 Isolated voids. In reference to Paragraph 4.4.3.1, isolated voids shall be cause for rejection if the diameter of the void is in excess of O. 66T. 5. PACKAGING 5.1 There are no applicable requirements for packaging. 6. NOTES (This section contains information
27、 of a general or explanatory nature that may be helpful, but is not mandatory.) 12 Licensed by Information Handling ServicesMIL-R-45774A ND - 994990b 057b092 O = MIL-R-45774A (MI) 6.1 Intended use. The processes covered by this specification are intended for use in establishing quality requirements
28、and inspection procedures for determining the quality of fusion welds in aluminum and magnesium. 6.2 Acquisition requirements. Acquisition documents must specify the following: a. Title, number, and date of the specification b. Issue of DODISS to be cited in the solicitation, and if required, the sp
29、ecific issue of individual documents referenced (see 2.1.1) c. Required period for maintaining inspection records (see 4.2). d. Sampling other than specified (see 4.3) 6.3 Limitations. Where weld quality exceeding the radiographic acceptance limits specified in this specification is required, the li
30、mitations will be specified in the contract or on the applicable drawing. Where special penetrameters are required, the special requirements will be specified in the contract or on the applicable drawings. 6.4 Metrication. Metric equivalents in accordance with FED-STD-376 are acceptable for use in t
31、his specification. 6.5 Subject term (keyword) listing. Metal Casting Penetrameters Penetration testing 6.6 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. Custodian: Army - M
32、I 13 Preparing Activity Army - MI Project No. NDTI-A068 Licensed by Information Handling ServicesMIL-R-45774A ND = 9997706 0576073 2 MIL-R-457 7 4A (MI ) Al-1 STANDARD I Al-2 STANDARD II Al-3 STANDARD III Al-3 - STANDARD IV Al-5 STANDARD V 14 Licensed by Information Handling ServicesMIL-R-45774A ND
33、7977706 0576074 4 M MIL-R-4 577 4A (MI) A2-1 EXAMPLE OF LINEAR POROSITY AND INCOMPLETE PENETRATION COMBINED . - . II A2-2 LINEAR POROSITY (EXAMPLE) A2-3 LINEAR POROSITY (EXAMPLE) El-1 UNDERCUTTING - SHADED AREA AT FUSION LINE DENOTES UNDERCUT a A3-1 ISOLATED VOIDS (TYPICAL EXAMPLE) (SEE 4.4.3.1 AND
34、TABLE III IF LINEAR) 15 Licensed by Information Handling ServicesMIL-R-45774A ND m 9999906 0576095 b m MIL-R-4 57 7 4A (MI) A3-2 ISOLATED VOIDS AND/OR LINEAR POROSITY (SEE 4.4.3.1 AND TABLE III) BI-1 TRANSVERSE CRACK - UNACCEPTABLE FOR ALL CASES B1-2 TRANSVERSE CRACK - BORDERLINE FOR CLASSES IV AND
35、v B2-1 LONGITUDINAL CRACK - AT WELD JUNCTION - UNACCEPTABLE FOR ALL CLASSES 16 Licensed by Information Handling ServicesMIL-R-45774A ND m 9999906 057bOb MIL-R-4577 4A (MI) B2-2 LONGITUDINAL CRACK - UNACCEPTABLE FOR ALL CASES - B3-1 CRATER CRACK - BORDERLINE FOR CLASSES IV AND v C1-1 FINE LINEAR PORO
36、SITY FORMING LACK OF FUSION. (THIS IS NOT A STANDARD BUT ILLUSTRATES TYPICAL OCCURRENCE) C1-2 LACK OF PENETRATION IN FILLET WELD (SEE SKETCH BELOW) (TYPICAL - NOT A STANDARD) FILM 17 Licensed by Information Handling ServicesMIL-R-45774A ND 9999906 057b097 T = M1L-R- 4 57 7 4A (MI) C2-1 ACCEPTABLE CL
37、ASS III DISCONTINUOUS IMPERFECT FUSION AT WELD INTERFACE-FAYING SURFACE JUNCTION OF FILLET WELDS C2-2 NOT ACCEPTABLE CLASS III DISCONTINUOUS IMPERFECT FUSION AT WELD INTERFACE-FAYING SURFACE JUNCTION OF FILLET WELDS C2-3 ACCEPTABLE CLASS III CONTINUOUS IMPERFECT FUSION AT WELD INTERFACE-FAYING SURFA
38、CE JUNCTION OF FILLET WELDS 18 Licensed by Information Handling ServicesC3-1 ACCEPTABLE CLASS III ONE OR BOTH SIDES OF WELD C3-2 UNACCEPTABLE CLASS III ONE OR BOTH SIDES OF WELD CONTINUOUS IMPERFECT FUSION AT WELD INTERFACE-FAYING SURFACE JUNCTION OF BUTT WELDS WITH BACK UP STRIP D1-1 FOREIGN INCLUS
39、IONS - MORE DENSE SHOWS TYPICAL TUNGSTEN INCLUSIONS. ISOLATED INCLUSIONS ACCEPTABLE IF NOT EXCEEDING T/2. SCATTERED INCLUSIONS AS SHOWN ABOVE SHALL BE REGARDED AS A FORM OF SCATTERED POROSITY. 19 Licensed by Information Handling ServicesIIL-R-45774A ND = 9999906 0576099 3 MIL-R-457 7 4A (MI) D1-2 FOREIGN INCLUSIONS - LESS DENSE MAY BE REGARDED SAME AS GAS POROSITY. Licensed by Information Handling Services
