1、Comments, suggestions, or questions on this document should be addressed to U.S. Army RDECOM, Tank Automotive Research Development and Engineering Center, ATTN: RDTA-EN/DM/STND/TRANS, MS# 268, 6501 E. 11 Mile Road, Warren, MI 48397-5000 or emailed to DAMI_STANDARDIZATIONconus.army.mil. Since contact
2、 information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mill/online/. AMSC N/A FSC 5420 INCH-POUND MIL-DTL-62749A 29 April 2010 SUPERSEDING MIL-DTL-62749 28 August 1995 DETAIL SPECIFICATION BRIDGE, FIXED: ALU
3、MINUM, HIGHWAY, UNITED KINGDOM, MEDIUM GIRDER AND ERECTION, AND TRANSPORTATION EQUIPMENT, FULLY COMPETITIVE COMPONENTS FOR This specification is approved for use by all departments and agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers all the fully competitive comp
4、onents for the bridge, fixed: aluminum, highway, United Kingdom, medium girder and erection, and transportation equipment which are listed in the Appendix to this specification. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are needed to meet the requirements specified in
5、 section 3, 4, and 5 of this specification. This section does not include documents in other sections of this specifications or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must
6、 meet all requirement documents cited in sections 3, 4, and 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified h
7、erein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62749A 2 DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-53039 - Coating,
8、 Aliphatic Polyurethane, Single Component Chemical Agent Resistant. MIL-DTL-64159 - Coating, Water Dispersible Aliphatic Polyurethane, Chemical Agent Resistant DEPARTMENT OF DEFENSE STANDARDS MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-130 - Identification Marking of U.S. Military Proper
9、ty. MIL-STD-889 - Dissimilar Metals. FEDERAL STANDARDS FED-STD-595/34094 - Green 383 (Unless otherwise indicated, copies of the above specifications, standards, and handbooks are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094 or h
10、ttps:/assist.daps.dla.mil/online/.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitati
11、on or contract (see 6.2). DRAWINGS As listed in Appendix A. (Copies of these documents are available from dami_standardizationconus.army.mil or U.S. Army RDECOM, Tank Automotive Research Development, and Engineering Center, ATTN RDTA-EN/STND/TRANS, MS #268, 6501 E 11 Mile Road, Warren, MI 48397-5000
12、) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). AMERICAN SOCIETY OF MECHANICAL ENGINEERS Boiler and Pressure Ve
13、ssel Code, Section IX, Qualification Standard for Welding and Brazing Procedures, Welders, Brazers and Welding and Brazing Operators. (Application for copies should be addressed to the American Society of Mechanical Engineers, 345 East 47th Street, New York, NY 10017 or website www.asme.org.) Provid
14、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62749A 3 AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI/ASQC Z1.4 - Sampling Procedure and Tables for Inspection by Attributes (Copies may be obtained from American National Standards Institute, 25
15、 West 43rd Street, New York, NY 10036 (or website: http:/www.ansi.org) or American Society for Quality, 600 North Plankton Avenue, Milwaukee, WI 53203 (or website: http:/www.asq.org/) AMERICAN WELDING SOCIETY (AWS) AWS-A5.1 - Covered Carbon Steel Arc Welding Electrodes. AWS-A5.10 - Bare Aluminum and
16、 Aluminum Alloy Welding Electrodes and Rods. AWS-A5.18 - Carbon Steel Filler Metals for Gas Shielded Arc Welding. AWS-Dl.1 - Structural Welding Code - Steel. AWS-Dl.2 - Structural Welding Code - Aluminum. (Application for copies should be addressed to the American Welding Society, (AWS), 550 N.W LeJ
17、eune Road, Miami, FL 33126 or website: http:/www.aws.org) NATIONAL MOTOR FREIGHT TRAFFIC ASSOCIATION INC, AGENT National Motor Freight Traffic Association Rules. (Copies may be obtained from American Trucking Association Inc, ATTN: Traffic Order Section, 1001 North Fairfax Street, Suite 600, Alexand
18、ria, VA 22314 or website: http:/nmfta.org.) UNIFORM CLASSIFICATION COMMITTEE AGENT Uniform Freight Classification Rules (Copies may be obtained from Railinc, 7001 Weston Parkway, Suite 200, Cary, NC 27513 or website: https:/ 2.4 Order of precedence. In the event of a conflict between the text of thi
19、s document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS Provided by IHSNot for ResaleNo reproduction or networking permitted wi
20、thout license from IHS-,-,-MIL-DTL-62749A 4 3.1 Description. All the fully competitive components of the bridge erection and transportation equipment, hereinafter known as the fully competitive components, shall be as specified herein (see Appendix). 3.1.1 Drawings. The drawings forming a part of th
21、is specification are end product drawings. No deviations from the prescribed dimensions or tolerances are permissible without prior approval of the contracting officer. Any data (e.g. shop drawings, layouts, flow sheets, processing procedures etc.) prepared by the contractor or obtained from a vendo
22、r to support fabrication and manufacture of the production item shall be made available on request, for inspection by the contracting officer or the designated representative. The dimensions shown on the drawings apply at temperatures from 68 to 70F and dimensional limits and surface texture designa
23、tions apply after plating and before painting. 3.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.3 Materials. Materials shall be as specified herein and on the drawings. Materials not specified shall be selected by the cont
24、ractor, and shall be subject to all provisions of this specification. 3.3.1 Material deterioration prevention and control. The fully competitive components shall be fabricated from compatible materials, inherently corrosion resistant or treated to provide protection against the various forms of corr
25、osion and deterioration that may be encountered in any of the applicable operating and storage environments to which the components may be exposed. 3.3.1.1 Dissimilar metals. Dissimilar metals shall not be used in intimate contact with each other unless protected against galvanic corrosion. Dissimil
26、ar metals and methods of protection are defined and detailed in MIL-STD-889. 3.3.1.2 Identification of materials and finishes. The contractor shall identify the specific material, material finish or treatment for use with fully competitive component(s) and shall make information available upon reque
27、st to the contracting officer or his designated representative. 3.3.2 Recovered material. The components, pieces and parts incorporated in the fully competitive components shall be newly fabricated from recovered materials to the maximum extent practicable, provided the components produced meet all
28、other requirements of this specification. Used, rebuilt or remanufactured components, pieces and parts shall not be incorporated in the fully competitive components. 3.4 Welding electrodes. 3.4.1 For steel. Welding electrodes for steel shall conform to AWS A5.1 and A5.18 classification E60XX or E70X
29、X series, size as required. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62749A 5 3.4.2 For aluminum. Welding electrodes for aluminum shall conform to AWS A5.10, classification ER 4043, size as required. 3.5 Performance. The components sha
30、ll perform as a system without evidence of the following defects when tested in accordance with 4.5.2: a. Malfunctioning of components. b. Binding of parts during launching, erection and disassembly. c. Permanent distortions. d. Material defects, such as cracks, and open joints and weld deterioratio
31、n. 3.6 Treatment and painting. The portions of the fully competitive components, normally painted, internal and external, shall be cleaned, treated, and painted. Unless otherwise specified (see 6.2), top coat color shall be camouflage green 383, #34094 of FED-STD-595 conforming to MIL-DTL-64159 or M
32、IL-DTL-53039. 3.7 Identification markings. The components shall be identified in accordance with MIL-STD-130 and as specified in the applicable drawings. 3.8 Zinc coating. Zinc coating shall be as specified on the applicable drawings. 3.9 Inspection equipment (gauges). Inspection equipment, when req
33、uired for verifying dimensions of fully competitive components of the erection and transportation equipment, shall be furnished by the contractor. Gauges shall be used to verify interchangeability by gauging interfacing dimensions. Gauges shall have been calibrated and certified by the contractor pr
34、ior to production of any component and shall be calibrated and certified as required during the course of the contract. 3.10 Interchangeability. All parts having the same part number shall be functionally and dimensionally interchangeable. Interchangeable parts are defined as two or more like parts
35、possessing such functional and physical characteristics as to be equivalent in performance and durability, and capable of being exchanged one for the other without alteration of the parts themselves and of adjoining parts, except for adjustment, and without selection for fit or performance. 3.11 Pro
36、of and preload. The contractor shall apply proof and preloads to the fully competitive components as specified on applicable drawings. 3.12 Repair of fully competitive components. Rejected fully competitive components may be repaired and submitted for inspection. Each repaired component shall be exa
37、mined for the defects specified in 4.5.1. Presence of one or more defects shall be cause for rejection. Defective welds shall be removed by mechanical methods, and the repair welding may be accomplished with the material at any temper. Bending, forming, and straightening of repaired components shall
38、 be done as specified on applicable drawings. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62749A 6 3.13 Workmanship. 3.13.1 Steel fabrication. Steel may be cut by shearing, sawing or flame cutting. Burned surfaces of flame cut material sh
39、all be ground or machined to remove cooling checks. All bends shall be made by use of metal dies or fixtures to insure uniformity in size and shape. All burrs shall be removed. 3.13.2 Aluminum fabrication. Aluminum used in the fabrication of the component shall be free from kinks and sharp bends. St
40、raightening of material shall be done by methods that will not cause injury to the metal. Surfaces and edges of all finished members shall be smooth and free from kinks, bends and winds. All forms of a major character shall be made with metal dies or fixtures to insure uniformity of size and shape.
41、Sharp instruments shall not be used for marking bend lines. Aluminum shall not be cut by methods using heat. Aluminum less than 3/8 inch thick may be cut by shearing; aluminum 3/8 inch thick and over shall be cut by routing or by high speed saws. Shearing and sawing shall be done neatly and accurate
42、ly. Material used must comply with the original material mechanical properties. 3.13.3 Bolted connections. Bolt holes shall be accurately formed and shall have the burrs removed. Washers or lockwashers shall be provided where necessary. All fasteners shall be correctly torqued according to the speci
43、fying document and shall have full thread engagement. Bolts shall protrude not more than two full threads. 3.13.4 Welders and welding. 3.13.4.1 Welders. Before assigning any welder or welding operator to welding work covered by this specification, the contractor shall obtain certification that the w
44、elder or welding operator has passed qualification tests as prescribed by either of the following listed codes for the materials joined and the type of welding operation to be performed and that such qualification is effective as defined by the particular code: AWS D1.1 - Structural welding Code - S
45、teel. AWS D1.2 - Structural Welding Code - Aluminum. ASME Boiler and Pressure Vessel Code, Section IX, Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and welding and Brazing Operators. 3.13.4.2 Welding. The surfaces of parts to be welded shall be free from dirt, scale,
46、paint, grease and other foreign matter. Welding shall be done by the shielded metal-arc or gas metal arc (GMAW, which is also called metal insert gas or MIG). All welded parts shall be free from slag, flux, welded spatter, cracks and other imperfections that may reduce the effectiveness of the part.
47、 Work shall be positioned for flat welding when practicable. Before welding over previously deposited weld metal, all traces of slag shall be removed and the deposit and adjoining base metal shall be wire brushed clean. Tack welds shall be subject to the same quality requirements as final welds. Pro
48、cedure and sequence shall be such that distortion and shrinking will be held to a minimum. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62749A 7 3.13.4.2.1 Steel welding. Where appropriate, welding shall be carried out to welding procedure
49、s which conform to AWS D1.1. 3.13.4.2.2 Aluminum welding. When welding Aluminum Alloy, the metal temperature of aluminum members to be welded shall not be less than +5C. Aluminum-magnesium alloys containing 4.0 to 5.5% magnesium, such as 5083, 5086, and 5456 should not be preheated to more than 93C prior to welding. For other wrought aluminum alloys, preheating temperature should not excee
