1、MIL-HDBK-21 29 No.vemberA995 SUPERSEDING 9 May 1979 MIL-STD-21A DEPARTMENT OF DEFENSE HANDBOOK FOR WELDED JOINT DESIGNS, ARMORED-TANK TYPE This handbook is for guidance only. Do not cite this document as a requirement. AMSC N/A AREA DRPR DISTRIBUTION STATEMENT A. Approved for public release; distrib
2、ution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-21 9999970 0208529 T55 m MIL-HDBK-21 FOREWORD 1. This handbook is approved for use by all Departments and Agencies of the Department of Defense. 2. This handbook is for guid
3、ance only. This handbook cannot be cited as a requirement. If it is, the contractor does not have to comply. 3. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Tank-automotive and Arma
4、ments Command, ATTN: AMSTA-TR-EBLUE, Warren, MI 48397-5000, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-HDBK-21
5、9999970 0208530 777 1 . 1.1 1.2 1.3 2 . 2.1 3 . 3.1 3.2 4 . 4.1 4.1.1 4.1.2 4.2 4.3 5 . 5.1 5.2 6 . 6.1 6.2 E3GU-R.E 1 2 3 4 5 6 MIL-HDBK-21 CONTENTS FOREWORD . SCOPE Scope . Purpose . Classification . APPLICABLE DOCUMENTS Non-Government documents . DEFINITIONS Weldingterms Welding symbols GENERALWE
6、LDING Selection of joint types Exposed surfaces Other surfaces Tolerances on design openings Sample drawing . WELDING JOINT TYPES Groovetypes Fillet types NOTES . Intendeduse . Subject term (key word) listing Type 1 . Single-v-grooved butt joint. welded both sides . Type 2 . Single-v-grooved butt jo
7、int. welding to backing Type 3 . Double-v-grooved butt joint. welded both sides Type 4 . Single-v-grooved corner joint. fillet-reinforced . Type 6 . Double-bevel-grooved comer joint. fillet-reinforced . Type 5 . Single-bevel-grooved corner joint. double-fillet reinforced ii 1 1 1 1 2 2 3 3 3 4 4 4 4
8、 4 4 5 5 5 6 6 6 PAW 7 8 9 10 11 12 . 111 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-21 CONTENTS FIGURE PAGS 7 reinforced 13 8 fillet welded joints 14 9 Type 9. Continuous-fillet-welded joint . 17 10 reinforcement . 18 11 Isometric draw
9、ing for illustration purposes only . 19 Type 7. Double-bevel-grooved tee or comer joint, double-filled Type 8A. Intermittent and Type 8B staggered intermittent Type 10. Continuous-fillet-welded joint with mechanical iv Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
10、nse from IHS-,-,-MIL-HDBK-21 9999970 0208532 54“ MIL-HDBK-21 1. SCOPE 1.1 Saqe. This handbook gives guidelines for particular welded joint designs used in the development of military armored tank type vehicles. This handbook is for guidance only. This handbook cannot be cited as a requirement. If it
11、 is, the contractor does not have to comply. 1.2 lhpse. This handbook covers welded joint designs when one or more of the materials being welded is armor. The provisions of this handbook refer entirely to full penetration-weld joints. 1.3 Classification . This handbook covers two basic weld types an
12、d variations of each. These weld types are groove type and fillet type. 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-21 2. APPLICABLE DOCUMENTS 2.1 Non-Government publications. The following documents form a part of this document to the
13、 extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the latest issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplements thereto. ANSIIA W S A2.4 Standard Symbols for Welding, Brazing and
14、Non- Destructive Examination. AWS A3.0 Welding Terms and Definitions. (Application for copies should be addressed to the American Welding Society (AWS), 2501 Northwest 7th Street, Miami, Florida 33125.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
15、-,-MIL-HDBK-21 9999970 0208534 312 MIL-HDBK-21 3. DEFINITIONS 3.1 Welding terms. Unless otherwise specified herein, terms used in referring to the joints will have the meanings defined in AWS A3.0. 3.2 Welding symbols. Unless otherwise specified herein, the welding symbols in the drawings will have
16、the meanings defined in AWS A2.4. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-21 D 9999970 0208535 259 D MIL-HDBK-21 4. GENERAL WELDING 4.1 -. 4.1.1 p. Surfaces subjected to ballistic attack, other than external attachments, generally
17、are all designed in accordance with figures 1-7. However, fillet welds may be used for surfaces directly exposed to ballistic attack provided they have mechanical reinforcement inherent in the part design. This reinforcement may be effective from all possible directions of ballistic impact (see figu
18、re 10). 4.1.2 Other. Surfaces not subjected to direct ballistic attack and attachments may be designed using figures 8,9 and 10. 4.2 . The design opening tolerances shown for various joint types are assembly tolerances and may not be considered as tolerances available for plate size variation but sh
19、ould include all other tolerances that may affect design opening, such as plate flatness, but not weld shrinkage. Y b 4.3 * . The isometric drawing (figure 11) is included as a guide only to show typical locations of various joint designs in an armored structure or vehicle. Encircled numbers on the
20、drawing should be taken as referring to the particular type of joint described in this standard. Suffix letters (figures 1-7 inclusive) have been omitted, since they identify plate thicknesses and other details, which will vary with the design of a specific structure of vehicle. 4 Provided by IHSNot
21、 for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-HDBK-ZJ D 9999970 0208536 195 MIL-HDBK-21 5. WELDED JOINT TYPES 5.1 Groovekgpm. Grooved joints are shown in figures 1 through 7. 5.2 m. Fillet joints are shown in figures 8 through 10. 5 Provided by IHSNot for Resal
22、eNo reproduction or networking permitted without license from IHS-,-,- MIL-HDBK-21 = 9999970 0208537 O21 = MIL-HDBK-21 6. NOTES 6.1 The joints specified in this handbook are intended for use in military vehicles or other structures that are to be subjected to ballistic attack. 6.2 -e(key wordllistin
23、g. Armored, tank type Continuous fillet Double-bevel-grooved, corner joint Intermittent-fillet-welded joint Single-v-grooved, butt joint Staggered intermittent-fillet Welded joint designs 8 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Joint No.
24、1A - MIL-HDBK-21 m 9999970 0208538 Tb m Included Design Angle Opening Max Plate Reinforcement Depth (dl (a) Root Face Thickness of Weld of X Y Z T R Bevel (Degrees) (millimeters) (millimeters) (millimeters) (millimeters) . (millimeters) 45 (b) 1.6 (4 o 19.1 2.4 T MIL-HDBK-21 NOTES: (a) (b) (c) (d) D
25、esign openings (see “Y” in fig. 1) do not include allowance for shrinkage during welding. Tolerance, plus 4.8, minus O millimeters. Tolerance, plus 1.6, minus O millimeters. Tolerance, plus 10, minus O degrees. FIGURE 1. Type 1. Smgkqq-mved - tu E-. 7 Provided by IHSNot for ResaleNo reproduction or
26、networking permitted without license from IHS-,-,- MIL-HDBK-21 W 9999970 0208539 ST4 Jint No. (a) 2A MIL-HDBK-21 Included Design Angle Opening Root Max Plate Depth X Y Z T Weld Bevel (Degrees) (millimeters) (millimeters) (millimeters) (millimeters) (millimeters) (4 (b) Face Thickness of of 45 12.7 (
27、c) (d) O 19.1 O to 2.4 T R W FEEMANENT BACKING . , NOTES: (a) (b) (c) (d) (e) To be used only where it is impossible to weld backside of joint. Design openings (see “Y” in fig. 2) do not include allowance for shrinkage during welding. Tolerance, plus 4.8 minus O millimeters. Tolerance, plus 1.6 minu
28、s O millimeters. Tolerance, plus 10, minus O degrees. FIGURE 2. Type Z Single - v FF. 8 , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-21 m 9999970 0208540 bLb a Design Opening (a) Y (millimeter) (b) 4.8 (b) 6.4 (b) 7.9 MIL-HDBK-21 Root R
29、einforcement Face of Weld Z R (millimeters) (millimeters) (c) o O to 2.4 (4 o O to 2.4 (c) 1.6 o to 2.4 Joint No. (a) 3A 3B 3c Included Angle (e) X (Degrees) 45 45 45 Depth of Bevel (millimeters) - 12.7 T 12.7 T 12.7 T NOTES: (a) (b) (c) (d) (e) Design openings (see “Y” in fig. 3) do not include all
30、owances for shrinkage during welding. Tolerance, plus 4.8, minus O millimeters. Tolerance, plus 1.6 minus O millimeters. Tolerance, plus or minus 1.6 millimeters. Tolerance, plus 10, minus O degrees. FIGURE 3. Type 3. Doa - Y grooved bu-. 9 Provided by IHSNot for ResaleNo reproduction or networking
31、permitted without license from IHS-,-,-MIL-HDBK-21 W 9999970 0208541 552 Joint No. 4A 4B 4c MIL-HDBK-21 Included Design Min Size (e) (a) Face Thickness Thickness Bevel Fillet X Y Z T T1 D S (Degrees) (millimeters) (millimeters) (millimeters) (millimeters) (millimeters) (millimeters) 45 (b) 4.8 (c) o
32、 to 6.4 (d) T 4.8 45 (b) 4.8 (c) O to 9.5 to 12.7 (d) T 6.4 Angle Opening Root Plate Plate Depth of of . 45 (b) 4.8 (c) O to 15.9 to 19.1 (d) T 7.9 FIGURE 4. Type 4. Singlevd - cow. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-21 99999
33、70 O208542 499 MIL-HDBK-21 Y- Included Angle 5D 5E - t Y A (b) 4.8 (b) 4.8 (b) 4.8 (b) 4.8 (b) 4.8 I Root Face Z (millimeters) (c) O to 3.2 (c) O to 3.2 (c) O to 3.2 (c) O to 3.2 (c) O to 3.2 P I Plate Thickness T (millimeters) 6.4 9.5 12.7 15.9 19.1 Plate (d) (d) Depth Bevel (millimeters) T Min Siz
34、e Fillet 6.4 7.9 12.7 Min Size of Fillet S1 (millimeters) 6.4 6.4 6.4 6.4 6.4 NOTES: (a) (b) (c) (d) (e) Design openings (see “Y” in fig. 5) do not include allowances for shrinkage during welding. Tolerance, plus 4.8, minus O millimeters. Tolerance, plus 1.6, minus O millimeters. Values to be equal
35、or greater than for T-plate thickness. Tolerance, plus 10, minus O degrees. FIGURE 5. Typd-Singk-beuel -groovedconierioint.double-fillet. 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- Join No. - 6A 6B 6C 6D 6E 6F - 45 45 45 45 45 MIL-HDBK-21 45
36、 (b) 4.8 (c) O 9.5 to 12.7 45 (b) 4.8 (c) O 15.9 to 19.1 45 (b) 6.4 (c) o 25.4 45 (b) 6.4 (cl 0 6.4 45 (b) 6.4 (4 0 38.1 MinIncluded Angle I Design I Root I Plate Opening Face Thickness (Outside) (Inside) (millimeter) (millimeter) (millimeter) Z T 45 I 45 I (b) 9.5 I (c) O I greaterthan 38.1 Plate T
37、hickness T1 (millimete1 Depth of Bevel D (millimeter) 16.9 to 19.1T 16.9 to 19.1T 16.9 to 19.1T 12.7 to 16.9T 12.7 to 16.9T 12.7 to 16.9T Min. Size of Fillet S (millimeter) 6.4 7.9 15.9 11.1 12.7 12.7 i ! FIGURE 6. Type 6. Doved v. 12 Provided by IHSNot for ResaleNo reproduction or networking permit
38、ted without license from IHS-,-,- MIL-HDBK-21 9799970 0208544 261 MIL-HDBK-21 NOTES: (a) (b) (c) (d) (e) (f) Design openings (see “Y” in fig. 6) do not include allowance for shrinkage during welding. Tolerance, plus 4.8, minus O millimeters. Tolerance, plus 1.6, minus O millimeters. Tolerance, plus
39、1.6, minus O millimeters. Thickness for each joint to be equal to or greater than its T-plate thickness. Tolerance, plus 10 minus O degrees. 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-HDBK-21 m 9999970 0208545 LT8 m Joint No. 7A 7B 7c 7D
40、 7E 7F 7G 7H MIL-HDBK-21 Included Angle Design Root Plate Opening Face Thick- (a) ness x(f) x1 Y Z T (Deg) (Deg) (Outside) (Inside) (millimeter) (millimeter) (millimeter) 45 45 (b) 4.8 (cl 0 9.5 45 45 (b) 4.8 (cl 0 12.7 45 45 (b) 4.8 (cl 0 15.9 45 45 (b) 4.8 (cl 0 19.1 45 45 (b) 6.4 (cl 0 25.4 45 45
41、 (b) 6.4 (c) 0 31.8 45 45 (b) 6.4 (cl 0 38.1 45 45 (b) 7.9 (c) 1.6 Greater than 38.1 t Plate Bevel 12.7 to 16.9 12.7 to 16.9 12.7 to 16.9 12.7 to 16.9 12.7 to 16.9 12.7 to 16.9 12.7 to 16.9 12.7 to 16.9 Min Size of Fillet S (millimeter) 6.4 7.9 9.5 12.7 15.9 19.1 22.2 22.2 Min Size of Fillet s1 (mil
42、limeter) 6.4 6.4 6.4 6.4 7.9 7.9 7.9 7.9 (a) (b) (c) (d) (e) (f) Design openings (see “Y” in fig. 7) do not include allowance for shrinkage during welding. Tolerance, plus 4.8, minus O millimeters. Tolerance, plus 1.6, minus O millimeters. Tolerance, plus 1.6, minus O millimeters. Thickness for each
43、 joint to be equal to or greater than its T-plate thickness. Tolerance, plus 10 minus O degrees. FIGURE 7. Type 7. DoW-hevel-jyov. 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-21 W 9999970 0208546 034 9 MIL-HDBK-21 Type SA - Intermitte
44、nt-fillet-welded joint. Type SB - Staggered intermittent fillet-welded joint. Plate thickness T or T1 Less than 9.5 mm 0.5 to 22.2 mm More than 22.2 mm Minimum size fillet S (a) 4.8 mm 6.4mm 7.9 mm -Y FIGURES. H. 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
45、 from IHS-,-,-MIL-HDBK-2L = 9999970 02085i)7 T70 1 * MIL-HDBK-21 NOTES: (a) (b) Fillet size “S” to be specified in accordance with design requirements, except that regardless of such requirements, minimum fillet size to be used is: Normal assembly dimensions will ordinarily give variations in dimens
46、ions “Y” of O to 2.4. This should be shown as a tolerance on the drawing and will not require any increase in fillet size. When the designer specifies a nominal dimension “Y” greater than O (zero) the fillet sizes are increased by this dimension. For joint types 8(A), 8(B), and 9, when the gap excee
47、ds the specified “Y” dimension plus .8 to 2.4 tolerance, a special procedure will be followed as required by the applicable specification covering the welding of armor. Length (“L”) will be not less than 25.4 millimeters. Pitch (,Cy) will be not less than 2L, or twice the length. Type 8A and Type 8B
48、 welds will be restricted to single-pass welds. (c) (d) (e) FIGURE When Y = 2.4 to 3.2 mm, S = Y plus designed fillet size. This joint type is not to be utilized without prior approval from the procuring agency at which time layouts will be reviewed showing the circumstances under which the joint is to be employed. The circumstances under which this joint is to be employed should be analyzed very carefully by the designer to assure that it will not b
