1、MIL-J-244LI5A 95 9999906 OLL8686 MIL-J-24445A (SH) 25 July 1977 SUPERSEDING MIL-J-24 44 5 (SHIPS) 1 March 1971 (See 6.4) MILITARY SPECIFICATION JOINT, BIMETALLIC BONDED, ALUMINUM TO STEEL This specification is approved for use by the Naval Sea Systems Command and is available for use by all Departme
2、nts and Agencies of the Depart- ment of Defense. 1. SCOPE 1.1 Scope. This specification covers aluminum to steel transition joints made by the roll bonding and explosion bonding processes. The joints are obtained from aluminum to steel bonded plate, and may be supplied in various geometries such as
3、bars, discs, rings, or rec- tangles. This specification does not cover joints made by welding or brazing. 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. The following documents, of the issue in effect on date of invitationforidc or request for proposal, form a part of this specification to the ext
4、ent specified herein. STANDARD MILITARY MIL-STD-271 - Nondestructive Testing Requirements for Metals. PUBLICATION NAVAL SEA SYSTEMS COMMAND NAVSEA 0900-LP-000-1000 - Fabrication, Welding, and Inspection of Ship Hulls. (Copies of specifications, standards, drawings, and publications required by contr
5、-actors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 3. REQUIREMENTS 3.1 First article. When specified (see 6.2.1), the contractor shall furnish sample bonded material for first article inspection and app
6、roval (see 4.3 and 6.3). Bonded material shall conform to the mechanical properties shown in table I. TABLE I. Mechanical properties for bonded joint matwial. I Bond ultimate I Welded Fabricated I Shear strength fatigue strength I tensile strength I -lb/in2 I lb/in2 I I I As clad 11,000 8,000 - i/ 2
7、/ 11,000 8,000 welding cycle- Simulated As welded - 3/ I. See footnotes at top of next page. t Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Ship Engineering Center, SEC 6124,
8、 Department of the Navy, Washington, D.C. 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document of by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-24445A(
9、S11) YPer 4.6.4. YSimulated welding thermal treatment shall consist of heating the sample to 600F 2 YPer 4.6.5. 25OF and holding for a period of 15 minutes. 3.2 Materials. Steel and aluminum alloy base materials in all joints produced to this epecificaton shall conform to the applicable base plate s
10、pecifications specified in the Contract (see 6.2.1). An intermediate aluminum alloy plate may be used as an interface material if required by the bonding process, and shall conform to the applicable plate specification of the contract (see 6.2.1). eection) Shall be basedone composition and thickness
11、 of the members which will be welded to the bimetallic strip for the intended application. The composition (that is, material types) and thickness of materials to be welded to the bimetallic joint will be specified in the contract (see 6.2.1) 4.5.1 and 4.5.3. when ultrasonically inspected as specifi
12、ed in 4.5.2. 3.3 Thickness and width OE, diameter. Thickness and width or diameter (unit cross 3.4 The bimetallic joint bond shall not fail when subjected to the mechanical tests of The bimetallic joint bond shall not exhibit any complete loss of back reflection 3.5 3.6 Out flatness. 3.6.1 Bars. Out
13、 o flatness for linear (bar) joints produced to this specification ehall not: exceed 1/16 inch over any 12 inch length. This shall be determined by moving a 12-inch straightedge along the length of the bar, Overall out of flatness shall not exceed 3/4 inch for bars 96 inches or less in length, or 1
14、inch for longer bars. 3.6.2 Plates. Out of flatness for joints procured in plate form shall not exceed 1/8 inch over any li-lhch span. 3.7 chamfer, Bar edges shall be chamfered to 1/16 inch minimum radius. Bar out of aquareness shallt exceed 1/32 inch deviation for cut ends or 1/16 inch for cut edge
15、s. 3 8 Ed e strai htnecs. not: exfieed- compression to 5,000 lb/in2 tension - 175,000 cycles. 15,000 lb/in2 compression to 1,000 lb/in tension - 650,000 cycles. 10,000 lb/in Use specimen of figure Y with length to suit -e mac ine capacity, The ratio of the cross sectional area of the aluminum 2 (a)
16、(b) (cl compression to 3,000 lb/in2 tension - 1,000,000 cycles. NOTE: In tho above fatigue tests, any failure in the bond shall be cause for rejection. The tost shall be repeated if base metal failure occurs prior to reaching the required number of cycles. shall be accomplished using the gas metal a
17、rc process. with one of the following conditions for acceptance. retest. 4.6.5 Welded tensile -. Use specimen of figure Y, Welding of the aluminum web Each specimen tested must comply Failure of a web weld shall require (a) Failure in one of the web members. (b) Failure o the bond interface or adjac
18、ent bonded material at a load above that calculated to cause failure in one of the web membere, based on the specified minimum tensile strength of the web material. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL- 5-2 444 5A (SH) 4.7 Test repor
19、ts. The contractor shall prepare a verified first article test report in accordancewith -the data ordering document included in the contract (see 6.2.2). copies of the first article test report shall be forwarded via the local DCAS representative to the Commander, Naval Ship Engineering Center (Engi
20、neering Materials and Services Office), Metals Section, Washington, D.C. 20362. To facilitate NAVSEC review of the test report, a basic description of the facilities, process used, quality assurance procedures, essential variables (see 4.4.2.1), and raw material specifications is required, Wo 4.8 In
21、s ection of re aration for deliver . The packaging, packing, and marking shall be inspected :or compxaicepwith section 5 of t&.s document. 5. PREPARATION FOR DELIVERY 5.1 Packing. 5.1.1 Unless otherwise specified (see 6.2.11, the bimetallic joints shall be prepared for shipment in accordance with co
22、mmercial practice to insure carrier acceptance and safe delivery at destination and shall meet, as a minimum, the requirements of carrier rules and regulations applicable to the mode of transportation. 5.1.2 The bimetallic joints, when shipped in open cases or trucks, unpacked or not wrapped in wate
23、rproof barriers or otherwise unprotected, shall be covered or shrouded with a suitable barrier adequately secured to protect the material against the corrosive or destruc- tive effects of cinders, dust, dirt, rain, sleet, and snow. When practicable, the covering or shrouding shall cover individual p
24、iles or lifts in lieu of a single cover for a carload shipment. 5.2 Marking. Marking shall be as required in the contract (see 6.2.1). 6. NOTES 6.1 Intended E. The bimetallic bonded joints are intended for welded structure where steel is to be jointed to aluminum alloy, such as the joining of an alu
25、minum deck house to a steel deck aboard ship. applications only, and require suitable coatings to prevent galvanic corrosion. The joints may be used in atmospheric and dry structural 6.2 Ordering data. Procurement documents should specify: 6.2.1 Procurement requirements. (a) Title, number, and date
26、of this specification. (b) When a first article is required for inspection and approval (see 3.1, 4.3, (c) Titles, numbers, and dates of the specifications governing the aluminum and and 6.3). steel base materials (and aluminum interface plate if applicable) required in the bimetallic joint. require
27、d by the applicable building specifications for the attaching members, or shall be for materials compatible to these members by welding (see 3.2). Type and thickness of material to be welded to the bimetallic joint (see 3.3). Governing base material specifications shall be those (cl) (e) Special pac
28、king requirements, if different (see 5.1). (f) Marking required on individual joints (see 5.2). 6.2.2 Data requirements. When this specification is used in a procurement which invokes the provision of the “Requirements for Data“ of the Armed Services Procurement Regula- tions (ASPR), the data identi
29、fied below, which are required to be developed by the contractor, as specified on an approved Data Item Description (DD Form 1664), and which are required to be delivered to the Government, should be selected and specified on the approved Contract Data Requirement List (DD Form 1423) and incorporate
30、d in the contract. When the provisions of the “Requirements for Data“ of the ASPR are not invoked in a procurement, the data required to be developed by the contractor and required to be delivered to the Government should be selected from the list below and specified in the contract. Paragraph Data
31、requirements Applicable DID Option First article inspection UDI-T-23450 - 4.7 report (Copies of data item descriptions required by the contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer. invitation fo
32、r bids or request for proposal shall apply.) Unless otherwise indicated, the issue in effect on date of 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-24445A (SH) 6.2.2.1 The data requirements of 6.2.2 and any task in section 3, 4, or 5 of t
33、he specification required to be performed to meet a data requirement may be waived by the procuring/purchasing activity upon certification by the offeror that identical data were submitted by the offeror and accepted by the Government under a previous contract for identical item procured to this spe
34、cification. This does not apply to specific data which may be required for each procurement, regardless of whether an identical item has been supplied previously (for example, test reports). 6.3 First article inspection. 6.3.1 Invitations or bids should provide that the Government reserves the right
35、 to waive tha requirement for samples for first article inspection as to those bidders offering a product which has been previously procured or tested by the Government, and that bidders offering such products, who wish to rely on such production or test, must furnish evidence with tho bid that prio
36、r Government approval is presently appropriate for the pending procure- ment. appropriate provisions of 7-104.55 of the Armed Cervices Procurement Regulation. article should be a irse production item. plate or assembly selected at random from the first production lot, should include specific instruc
37、tions in all procurement instruments regarding arrangements for examinations, test, and approval of the first article. 6.4 Chan es from revious issue. The extent of changes (deletions, additions, etc.) precludes &owob individual changes from the previous issue of this document. 6.3.2 When a first ar
38、ticle is required, it shall be tested and approved under the The first article should consist of a bonded The first The contracting officer Preparing activity: Navy - CH (Project 9535-NO 37) 1fU.S. GOVEIINMENT PRINTING OFFICE: 1977-763-020/4756 6 Provided by IHSNot for ResaleNo reproduction or netwo
39、rking permitted without license from IHS-,-,-TOOL STEEL RAM RAM TENSILE SPECIMEN TOOL STEEL BASE BLOCK SH11204 ALUMINUM BOND ZONE STEEL FIGURE 1. Sketch of ram tensile. (Specimen and fixture for testing bond zone tensile strength.) 7 Provided by IHSNot for ResaleNo reproduction or networking permitt
40、ed without license from IHS-,-,-Saw 13“ Nominal Band Zone LAluminum $Radius I Sif11205 NOTES : 1, 2. Sketch dimensions may be appropriately scaled for testing of Hole depth d below bond line shall be 0.064 inch or greater products less than 1-5/16 inch wide. in a1 cases. FIGURE: 2. Ram tensile speci
41、men. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A, Specimen Selection Sample Plate Cuts for specimen I Aluminum I I 4 - I I Steel - NOTE S : 1. Thickness t - 1/16 inch minimum. 2. Width W = 2 inch, Where width of product manufactured is less tha
42、n 2 inch, or product geometry requires a curved bond interface of radius less than 12 inch, two (2) specimens of width W = 1 inch may be substituted for each 2 inch specimen. FIGURE 3. Selection and setup of bend test specimens. - Continued 9 Provided by IHSNot for ResaleNo reproduction or networkin
43、g permitted without license from IHS-,-,-R Test Setup lev1 Steel SIDE - NOTES : 1. 2, 3, Height h of top of bond interface above vise shall be at least Bond line shall be parallel to top of vise or edge of clamping Test shall be commenced with specimen at ambient temperature. FIGUE1E: 3. Selection a
44、nd setup of bend test specimens. 1/2 t, but not more than t. jaws, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-t . hammer I 8 Front - SH11207 FIGURE 4. Performance of bend test. - Continued 11 4 Provided by IHSNot for ResaleNo reproduction or net
45、working permitted without license from IHS-,-,- - MIL-J-2YYqSA 75 = 7397906 011ib97 E! MIL-J-244 45A (SH) NOTES : 1. 2. 3. 4. 5. 6. Specimen shall be tested by hammer bending or by bending Bending shall result in the formation of an angle of at in a press brake. least 90 degrees between the aluminum
46、 portion and a line defined by continuation of the steel portion of the specimen held in the vise or clamping jaws. Bending shall be accomplished so that plastic deformation of the aluminum is initiated at the bond interface. Distance L of highest portion of hammer bent specimens from the level of t
47、he top of the vise shall not exceed 3 k. For specimens bent by press brake, bend radius measured to outer fiber of the aluminum shall not exceed 3 t. Bent specimen shall be examined with the unaided eye. For accepkance, there shall be no individual crack or other open defect greater than 1/8 inch. T
48、otal accumu- lated length of all visible defects shall not exceed 20 percent of the bond length W. The test shall be repreated if any failure occurs in the aluminum or steel base metal before the specimen is bent 90 degrees. FIGURE 4. Performance of bend test. 12 Provided by IHSNot for ResaleNo repr
49、oduction or networking permitted without license from IHS-,-,-A Shear Test Flxture J Il II I I II 1 -1 I I I. I srmer- kT 5/8“ max, I Sido A-A NOTES t 1. Fixture material: hardened tool steel. 2. 3. 4. Grease slinding surfaces lightly. 5. Spacer blocks sized to produce gap no more than .O05 inch larger than Front steel face of specimen may be shimm
