1、 - MIL-W-12332A TH m 7797706 0299326 2 W U /y-o 9-20 HL-W-12332A(naR) 14 DECEMBER 1964 SUPERSEDING MIL”W-l2332(0rd) 12 NOVEMBER 1952 MILITARY SPECIFICATION WELDING, RESISTANCE, SPOT, SEAM, AND PRO JECTIQN; FOR FABRICATING ASSEMBLIES OF LOW-CARBON STEEL 1. SCOPE 1.1 Type of welding. This specificatio
2、n covers the spot, seam, and projection, resist- ance welding of low-eanbon steel fabricated assemblies (see 4.1 and 8.1). 1.2 Materials. The materials to be welded under this specification include light steel sheets, forgings, castings, or shapes. 2. APPLICABLE DOCUMENTS 2.1 The followi,ng document
3、s of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to .the extent specified herein. SPECIFICATIONS NILITARY MIL145208 - Inspection Require- ments, General flpecification for. STANDARDS MILITARY JAN-STD-19 - Welding Symbols. MINTD-20 -We
4、lding Terms and Definitions. (Copies of specifications, standards, and drawings required by contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the con- tractin officer.) 2.2 Other publications. The following docu- ments form
5、 a part of this specification. Un- less otherwise indicated, %he issue in effect on ,d,ate uf invitation for :bids shall apply. AMERICAN WELDING SOCIETY Resistance Welding - Theory and Use. (Application for copies should be addressed to the American Welding Society, United Engineering Center, 346 Ba
6、st 47th Street, New York, N;Y.) RESISTANCE WELDER MANUFACTURERS ASSOCIATION Resistance Welding Manual. (Application for copies should be addressed to the Resistance Welder Manufacturers Association, 1900 Arch Street, Philadelphia, 3, Pa.) 3. PROCEDURE REQUIREMENTS 3.1 Recorded welding procedure. Unl
7、ess otherwise specified in the contract or order, Dhe contractor, prior to production fabrica- tion of any weldment shall establish or have- the manufacturer establish and record the “I Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or networking permitted with
8、out license from IHS-,-,-MIL-W-l2332A(MR) cleaning and welding procedures to cover dl welding to be performed .under this specifi- cation. This information- shall :be prepared in duplicate on an approved form (see appendix) utlizing symbols and ,terms in accordance wi,th JAN-STD-19, MIGSTD- 20, or a
9、s specified un the drawing. The cover. sheet shall *be signed by th anzifao.ture and the contractor. The recorded welding procedure shall be submitted to the procur- ing activity with $he test record8 as specified in 6.4. Any changes in any of khe factors listed in table I shall require revision of
10、the recorded test procedure. 3.2 Factors. The factors to be Included in tbe welding procedure shall ;be as shown in table I. TAB- I. Fuctors in the recorded welding pocedure and changes I* . requieng qzali% .ccmtrol. tests Factora to be included in recorded welding procedure I, Metal alloy compositi
11、on . .- .I - * .: 3. - i . .-: 2, Thickness range of metal 3. Weld time range 4. Metal cleaning 5. Welding current range 6. Electrode force range I 7. Roll spot or seam welding travel speed ,. 4. MATERIAL REQTJIREMENTS 4.1 Carbon content. Themaximum carbon content of any material .to be welded .shal
12、l not exceed 0.20. percent (see 8.4). . - . 4.2 Surface preparation. The material pur- facis shall $e cleaned by a -suitable method and shall be free from ,di shall be- inbluded as a part of $he recorded welding procedure and shall not be considered forfgn matter. 5, WELDING EQUIPMENT REQUIRE- MENTS
13、 - -. 5.1 Welding. machine. The welding machine shall consist of a suitable soulce of electrical energy, suitable electrodes, means of ade- quately cooling the electrodes; zl mens of reliably controlling the -magnitude of .the current, the welding force, and the time of current flow to fulfill the r
14、equiremenh speci- fied herein, The force :and current controls 2 - / - -* , .LC. . . .F - I Procedure changes requiring revised procedures and testa When a change in alloy or alloy composition out- side the producers declared chemical range is made to- either of the metals that are to be . joined. -
15、 When the thickness range is changed. When meld cycle range is changed. When method of cleaning is changed from the recorded methods in the welding procedure, When current setting changes outside the declared range are made. When changes outside the declarecl range are made. When changes outside the
16、 declared range are made, shall operate so that no current flows until the welding force is applied at the welding electrodes. The current shall )be cut off before the force is removed. 5.2 Weld timer. The weld timer shall con- trol bhe following timing functions : Single impulse IMztZtMe impxlas Ro
17、U apot or . welding - . welding . seam welding Squeeze time . Squeeze time . Travel speed Weld time Heat time . . , , Weld time on Hold time Cool time . Weld time off: Weld interval Pulse frequency Hold time . 5.3 Roll spot .or seam welding travel speed. Speed adjustment provided shall have ref- ere
18、nce scale calibrations to permit .determi- nation of speed in inches per minute either directly or by reference to a calibration chart. . 5.4 Welding current. Means or controlling ;the welding current between specified limits shall ,be provided. This may be accomplished -. ,v -. . 1s ;,I: .: - . , .
19、 d Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- by ,use of tapped transformersI phase shift- ing heat control circuits or both. 6. PREPRODUCTION REQUIREMENTS 6.1 Certification of welding equipment and recorded welding procedures. Prior to weld- i
20、ng the first production assembly of each specific design, the contractor or the ma.nu- facturer, or bo;Dh, .shall weld and Zest the welds in one assembly or simulated specimen under :Government surveillance. The assem- bly or specimen shall be welded in ;accord- ance wikh the recorded welding proced
21、ure. This certification test shall be carried out on each welding machine that will be used for the produotion of weldments of each specific design. 6.1.1 Simulated specimens. When a simu- lated specimen is used, the material thick- ness, composition range, weld edge .distance, spot spacing, ,and th
22、e general weld area cun- tour and metal fit shall be the same as the production part. When $he .application of meld primer or sealer is required by the re- corded welding procedures for production assemblies, the ,simulated specimens shall have these materials applied lbefore welding in the same man
23、ner as applied to production parts, When a substantial mount of m,ag- netic material such as the assembly fixture, locators, etc., is inserted in the throat of the welding machine during the welding of a production part, this condition shall tbe close- ly duplicated for the simulated specimen. 6.2 V
24、isual examination of welded assembly or simulated specimen. All welds shall be subjeot to visual examination to determine compliance with 7.3.1. 6.3 Testing. The welded assembly or simu- lated specimen shall be subjected to the peel tests in accordance with 7.3.3. 6.4 Reporting of results The manufa
25、cturer shall record the results of this certification and shall submit copies of the results to- gether with the recorded welding procedures through the contractor and contracting - ., - .L “ - I. MIL-W-12332A (MR) officer for review by the procuring activity. 6.5 Rejection. Failure of the welded as
26、sem- bly or simulated specimens to meet the re- quirements for visual examination (see 7.3.1) or the peel test (see 7.3.3) shall result in the rejection of the recorded welding pro- cedure. 7. PRODUCTION REQUIREMENTS 7.1 Quality control. The contractor shall establish or have the manufacturer establ
27、ish and use the systematic quality control pro- cedure specified in MIGI-45208. . 7.1.1 Production checking. Periodically during a produotion run, a welded assembly or simu1,ated specimen shall be tested as shown in section 6. The frequency of testing shall be as specified in the contract or order.
28、7.2 Procedure inspection. All welding oper- ations shall :be subject to. inspection for com- pliance with the certilfied welding p1:ocedures and quality control procedures of the con- tractor and manufacturer. 7.3 Weldment inspection. 7.3.1 Tlisuat examination. The outer sur- face of all welds shall
29、 be smooth and free of cracks, tip pickup, pits, metal expulsion, and other defeots which indicate that the welds were made with contaminated electrodes or with improperly prepared surfaces. 7.3.2 Tolerances. Tolerances on spot weld spacing an.d edge distance shall be as speci- fied in the contract
30、or order or on the draw- ing. 7.3.3 Peel tests. Welded assemblies or sim- ulated specimens shall be tested Iby the peel tests in accordance with the provisions for such testing established in the quality con- trol procedures. 7.3.3.1 Test procedu?-e for spot zuelds. The weldment or simulated specime
31、n shall be separated by dLriving a chis21 between the welded components in an unwelded area or by peeling one sheet back against the weld until failure occurs around the periphery of 3 F “-. b .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-
32、l2332A(MR) ithe weld ,or until the part fails. Failure of the !base metal outside the weld area shall be considered evidence that ;the welds are satis- factory. The minimum button diameter, as measured in two perpendicular directions at the faying surface, shall conform to table II. TABLE 11, Peel t
33、est raquimments Inches .10 .13 .l6 .19 .22 .25 .29 .31 .32 .33 Thickness of thinner part1 Mininmum button diameter I Inches .o10 ,020 .O31 ,040 ,060 .O62 .O78 .O94 ,109 ,125 For intermediate thicknesses, direct interpolation may be use 7.3.3.2 Test procedwe for projection welds. The weldment or simu
34、lated specimen shall he sepamted by driving .a chisel .be- tween $he welded components in .an unwelded area or peeling one sheet /back against the weld unti.1 failure occurs. Failure outside the periphery .of the weld area shall be consid- ered evidence ,that the welds are satisfactory. Lack of fusi
35、on under the projection ,shall be cause for .rejec;tion, It is not necessary to pull buttons in this test, ,provided the entire area of each of at least sf the projections show significant evidence of fusion. 7.3.3.3 Test procedum fwr seam welds. 7.3.3.3.1 Macroscopic ezamination. The weldment or si
36、mulated specimen shall *be cross-sectioned and etched. The nugget pene- tration shall be 30 percent to 80 percent o the sheet hhicknesses involved. The width of the seam weld shall conform to kthe heavier thickness if unequal thicknesses are .invulved) in .a vise. The thinner sheet shall !be pulled
37、back against the weld until it shears off. The process shall .be repeated on the other side of the specimen, leaving only ithe thicker Bheet and *he weld fusion zone. Before the fusion zone width is measured for mnformance to table III, the specimen shall be flattened without causing metal flow. TAB
38、LE III. Shear peel test requiremmts Thickness of thinner part 1 ,010 .o20 .O31 .O40 .O50 .O62 .O78 .O94 .IO9 ,125 ninimum fusion zone width1 ,O8 .ll .14 .16 S8 .20 .22 .26 .26 .28 - For intermediate thicknesses, direct interpolation may be used 7.3.4 Rejected wetds. If unsatisfactory welds are found
39、 during a production quality control inspection, ,the production run shall be stopped and necessary corrections made to the equipment or procedure. After correc- tion, a weldment or simulated specimen shall be welded and shall conform to the inspection requirements in 7.3.1 and 7.3.3 ,before re- sum
40、ing produdion. The ,series of weldments in $he period subsequent to the last accept- able quality control inspection shall :be re- jected or may Ibe rewelded in accordance with 7.3.6, 7.3.5 Rewelding OT rejected weldments. A weldment from each rejected series may be rewelded in accordance with the n
41、ew proce- dure. The repaired weldment shall meet th,e i.nspection requirements of ;this specification. If the weldment passes the inspections, the rejected weldments may be rewelded using the new procedure. A simulated specimen shall not be .used for determining weld qual- ity of .repair welding. 8.
42、 NOTES 8.1 Intended use. Resistance welding under 4 1 /- 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-22332A TH 7777706 02411320 11 - - MILW-12332A (MIR) this specification covers only spot, seam, and projection welds. 8.2 Certification te
43、sting. The certification test is intended to ascertain th,at ,the specific welding unit being used has the electrical and mechanical capacity to satisfactorily produce a particular weldmenit. This test need not be repeated so ,long as the design and ,materials of the part being welded re- main uncha
44、nged, except as may be required by 7.1. 8.3 Definitions. the ,Government activity. 8.3.2 Manafacturer. The term “manufa.c- turer” is defined as the organization actually performing $he operations covered lby this specifioation. 8.4 It is recommended that ;the maximum manganese content not exceed 0.6
45、0 percent: Custodian: Preparing activity: Army-MR Army-MR Other interest: Project No. MI07-AO18 Review : MO MU 8.3.1 Contyactcn As used in khis specifica- User: MR ition, the term “contractor” is defined as the WC organization having a direct contract with MI Note. ReviewIUser information is current
46、 as of the date of this document; draft circulation should be based on the information in the current DODISS. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-123328 (MR) 10. SCOPE .10.1 This appendix contains a suggested form for the submittal
47、of the , recorded joint welding procedures and -the instructions for coqleting the .I, fom. X,. INSTRUCTIONS 20.1 The recorded procedure consists of four sheets sf an approved form. In completing the information required for a weldment, it may be necessary to use two or more pages of any one or abl
48、of the last three sheets of.the il9iustrated form. This use i8 shown in the illus-bration, where sheets .4 and 5 are of fhe same form but represent different weldments. 20.1.1 Sheet one (a) Record number. - Number selected. by the contraetor. or manufac- turer to designate a particular procedure. (b
49、) Part name, drawing number and revision date. - Name and number appearing on the print for the weldluent. (c) Mmnkactured by.- Name of the company actually performing the welding. - (d) Location. - Full address of the manufacturer including street and zone number. (e) Approved by the manufaturer. - Signature of responsible employee of conpany performing the welding. ( f) Approved by the contractor. - Signa,ture of responsible
