1、MIL-E-24403A (I) 34 m 9999906 O246864 T m Form 3a 3b MIL-E-24403A(SH) AMENDMENT 1 30 August 1983 Diameter sizes (inches) . 0.045, 0.052 0.045, 0.052, 0.0625, 5/64, 3/32 MILITARY SPECIFICATION 3“: 4 ELECTRODES - WELDING, FLUX CORED, GENERAL SPECIFICATION FOR 0.045, 0.052, 0,0625, 0.068, 0.072, 5/64,
2、3/32, 7/64, 0.120, 1/8, 5/32 11 This amendment forms a part: of MIL-E-24403A(SH), dated 21 December 1981, and is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. PAGE 1 TABLE I. Delete an
3、d Substitute: “TABLE I. Electrode diameter sizes. At bottom of page “Beneficial comments“ statement, line 3: Delete “SEA 3112“ and substitute “SEA 5523“. PAGE 4 3.4.4: Add: “The chemical composition of the core ingredients necessary to produce a weld that meets all requirements is optional with the
4、manufacturer.“ 3.4.6: Delete and substitute: 3.4.6 Soundness. Unless otherwise specified in the detail specification (see 3.2), groove welds shall meet the requirements of NAVSEA 0900-LP-003-9000, class 1 for radiographic inspection.“ I1 :- U.S. GOVERNMENT PRINTING OFFICE: 1383-605-034:4554 1 of 10
5、FSC 3439 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-24403A(SH) AMENDMENT 1 PAGE 10 4.6.2.1 and 4.6.2.1.1: Delete and substitute: “4.6.2.1 Radiographic inspection. Radiographic inspection shall be in accordance with level 2-2T of MIL-STD-27
6、1.” PAGE 11 4.6.5: Delete and substitute: “4.6.5 Diffusible hydrogen. A sample of each lot for each size and MIL type of electrodes furnished to the requirements of this specification shall be tested for diffusible hydrogen level in the weld metal. the deposited weld metal shall be determined by the
7、 analytical method of gas chromatography (see 4.6.5.2) or by the method of collection over mercury (see 4.6.5.3). correlation with the two methods above may be used. The hydrogen level of Alternate methods or apparatus which yield results of one to one “4.6.5.1 Specimen preparation. The test specime
8、ns for the diffusible hydrogen analysis shall be prepared according to the following: (a) The testing of each size and MIL type electrode requires four separate diffusible hydrogen determinations, that is, four test specimens. Each test specimen consists of a 10- by 15- by 30- millimeter (mm) steel
9、block with the weld metal deposited upon it. For collection over mercury method, specimefis shall be 1/2 by 1 by 5-inch (see 4.6.5.3). These larger specimens shall be weighed to the nearest 0.1 gram before and after welding. steel block. For electrodes 1/16 inch and smaller, the test specimen weldin
10、g direction is the 30-mm direction and a single test specimen between run-on and run-off pieces is used for each weld deposit. For electrodes larger than 1/16 inch, the test specimen welding direction is the 15-mm direction and two test specimens between run-on and run-off pieces are used for each w
11、eld deposit. The arrangements of test specimens with run-on and run-off pieces for the various electrode sizes are shown on figure 3. The material for the test specimen and run-on and run-off pieces shall be plain hot rolled ordinary strength steel containing not more than 0.25 percent carbon, 0.35
12、percent silicon, 0.03 percent phosphorous and 0.03 percent sulfur. Rimmed steel is not acceptable. 1 hour at 1200-1235F prior to finish grinding to size. finished surfaces shall be orthogonal with dimension tolerances of plus or minus 0.25 mm and maximum surface roughness of 120 microinches root mea
13、n square (rms) on all surfaces. For the collection over mercury method, the edges and corners shall be rounded (approximately 1/64-inch radius) to break the sharp edge to prevent scratching the eudimeter tube. (b) The test specimen thickness is always the 10-mm direction of the (c) The material shal
14、l be degassed by holding for The 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-24403A (1) 34 7777706 0246866 3 M MIL-E-24403A(SH) AMENDMENT 1 Each test specimen shall be given an identification number or mark by stamping or engraving its su
15、rface opposite to the welding surface. number shall be removed by lightly sanding on 600 grit paper prior to degreasing and weighing. Each test specimen shall be weighed to the nearest 0.01 gram before welding and the weight shall be recorded along with the specimen identification. Immediately prior
16、 to welding the test specimen and run-on and run-off pieces shall be thoroughly degreased. Three feet of electrode shall be fed out of the gun, cut off and discarded just prior to each test weld deposit. The welding parameters during test welding shall be the same as those used to make the test weld
17、ments as shown on figure 1. The pieces of the test assembly (see figure 3), shall be placed in the appropriate copper clamp (see figure 4), butted together and tightly clamped. An annealed copper foil (as shown on figure 4 fixture for 1/16-inch and smaller electrodes) is used between the test assemb
18、ly and copper clamp. This protects the clamp from arc strikes and thermally couples the test assembly with the copper clamp. The foil may be annealed and cleaned after each use. The foil is 1 to 2 mm in thickness. Immediately prior to welding, the temperature of the test assembly and copper clamp sh
19、all be 20 2 5 degrees Celsius (OC). The copper clamp may be water cooled. A single stringer bead (without weaving) shall be deposited in the flat position, approximately 100 mm in length. The test assembly shall be removed from the fixture, quenched in iced water within 5 seconds of extinguishing th
20、e arc, and agitated vigorously in the iced water until cold to the touch (about 20 seconds). It shall then be immediately removed from the quench and placed in a low temperature liquid bath at dry ice temperature (-78OC) or colder. At dry ice temperature the test assembly may be stored for a maximum
21、 of 3 days before loading into the hydrogen sampler cannister. At liquid nitrogen temperature (-196OC) the test assembly may be stored for a maximum of 3 weeks. cold, break off run-on and run-off pieces. Remove any remaining slag. If an electrode larger than 1/16 inch was used, break the test assemb
22、ly into two test specimens again. During the breaking and cleaning operation, the test pieces shall not remain out of the low temperature bath for more than 60 seconds at a time. If necessary, they shall be returned to the bath for a mnimum of 120 seconds each time between portions of the cleaning a
23、nd breaking operation. Each cleaned 10- by 15- by 30-mm block with its weld deposit constitutes a test specimen. After completion of the cleaning and breaking operation, each test specimen shall be returned to the low temperature bath for a minimum of 120 seconds. Any upset from the identification m
24、ark or Remove test assembly from low temperature bath and, while still “4.6.5.2 Gas chromatography method. The gas chromatography method, when used, shall be conducted in accordance with the procedures as specified in 4.6.5.2 :2. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted
25、 without license from IHS-,-,-I MIL-E-24403A (i) 3Y 7777706 024bb7 5 = MIL-E-24403A(SH) AMENDMENT 1 4.6.5.2.1 Equipment. A suitable apparatus is the Yanaco Model G1005 Il Hydrogen Analyzer and Model GS1006 Sampler or equivalent. “4.6.5.2.2 Procedure. Continuing with the specimen from 4.6.5.1(k), the
26、 procedure shall be as follows: Using tongs, remove a first test specimen from the low temperature bath and agitate in a cool water bath (not iced) until the ice skin which formed on the specimen has just melted. draw from the water bath and dry with a compressed air blast lasting no longer than 5 s
27、econds. ber one cannister of hydrogen sampler, close the cannister and flow welding grade argon at 5 to 10 cubic feet per hour (ft3/h) into the cannister through the tube at the bottom of the can- nister (exhausting at the top of the cannister). At the end of 30 seconds of argon flow into the Cannis
28、ter, turn the manifold dial to the next cannister position. Repeat for second through fourth specimens and cannisters respec- tively. After the fourth cannister is loaded and purged with argon for 30 seconds, turn the manifold dial to the bypass posi- tion next to the fourth cannister position and l
29、eave it there until hydrogen analysis is begun. Hold the hydrogen sampler in a constant temperature oven at 45 I 3C for 72 hours (plus 5, minus O). Cool the hydrogen sampler to room temperature for a minimum of 1/2 hour and a maximum of 3 hours before hydrogen analysis. Connect the hydrogen sampler
30、to the gas chromatograph hydrogen .analyzer and determine the hydrogen volume in milliliters (mL) at standard temperature and pressure (OOC, 760 mm mercury abso- lute pressure) according to the manufacturers instructions for each cannister, working in reverse order to the loading order. volume for t
31、hat cannister to the specimen number. specimen to the nearest 0.01 gram and record. difference between the final specimen weight and the initial specimen weight. The volume of hydrogen divided by the weight of the deposited weld metal shall be recorded as the hydrogen content for each test specimen,
32、 in milliliters per gram (mL/g) of deposited metal. The four values obtained and the average value, all rounded to the nearest 0.001 mL/g, shall be reported. Immediately with- Immediately place in the num- Remove each specimen from its cannister and match the hydrogen Weigh the The weight of the dep
33、osit weld metal shall be calculated as the “4.6.5.3 Collection over mercury method. The collection over mercury method, when used, shall be conducted in accordance with the procedure as specified in 4.6.5.3.3. 4.6.5.3.1 Warning. Working with mercury can be dangerous to health. II This test should be
34、 conducted only by personnel knowledgeable in the field of mercury toxicology and can handle mercury with proper precautions. involving the handling of mercury shall be observed which include, but are not limited to, the following: Precautions -4 Provided by IHSNot for ResaleNo reproduction or netwo
35、rking permitted without license from IHS-,-,-MIL-E-24L!03A (1) 34 m 7797706 0246868 7 MIL-E-24403A(SH) AMENDMENT 1 (a) The diffusible hydrogen test apparatus shall be located under a fume hood and any steps involving the handling of mercury shall be performed under a fume hood. mercury or mercury co
36、ntaminated samples and equipment. (b) (c) (d) Plastic or rubber gloves shall be used at all times while handling Any mercury spill shall be cleaned up immediately. When not in use the temperature bath shall be turned off and the mercury in the plastic reservoir bottles shall be capped. “4.6.5.3.2 Eq
37、uipment. The system shall be designed to conduct four separate determinations at the same time or multiple sets of four. Any brand of equipment may be used. However, equipment has been found available as follows : (a) Fisher versa-bath, Fisher Scientific Co. (b) Polyethylene bottles, Fisher Scientif
38、ic Co. (c) Bath oil; any quality, stabilized, nonsmoking. (d) Eudiometer tubes, calibrated and teflon stopcocked, Adria (e) (f) Purified mercury. (8) Fume hood, Scientific Glass, Box 673, Geneva, OH 44041. High vacuum grease, Dow Corning.- “4.6.5.3.3 Procedure. The procedure for the collection of di
39、ffusible hydrogen over mercury shall be conducted under a fume hood and shall be con- ducted as follows: (a) With the stopcock closed insert a vacuum line over the tip of the eudiometer tube. vacuum grease.) (b) Using tongs, remove a first test specimen (see 4.6.5.1(k) from the low temperature bath
40、and agitate in a cool water bath (not iced) until the ice skin which formed on the specimen has just melted. Immediately withdraw from the water bath and dry with a compressed air blast lasting no longer than 5 seconds. Using tongs, insert the weld test specimen vertically into the bottle of mercury
41、, (The specimen will float in the mercury.) Slide the eudiometer tube over the specimen and into the mercury. The mercury shall be at room temperature. be pulled up and around the test specimen in the eudiometer tube. Close the stopcock when the mercury is about halfway up the cal- ibrated portion o
42、f the eudiometer tube and bounce the sample and tube slightly against the bottom of the plastic jar to remove any entrapped air bubbles. Carefully open the stopcock again and allow the mercury to completely fill the tube and just pass through the stopcock opening. Close the stopcock and remove the v
43、acuum line. (The stopcock should be greased with high (c) (d) Slowly and carefully open the stopcock and allow the mercury to (e) (f) Heat the assemblies (see 4.6.5.3.3(d) and (e) in the oil bath (8) After the bath has reached 45OC, hold at 45 2 3C for 72 hours Repeat this procedure for second throu
44、gh fourth specimens. to 45OC. (plus 5, minus O). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-2q403A (1) 34 W 7777706 0246869 7 W MIL-E-24403A(SH) AMENDMENT 1 (h) Before any readings are taken, bounce the tube to release any entrapped bubb
45、les of hydrogen. Read the hydrogen level to the nearest 0.05 mL. Measure the head of mercury (in mm) present as shown on figure 5. Release the vacuum by opening the stopcock so that the mercury runs back into the plastic bottle, and remove the specimen from the mercury using tongs. water while holdi
46、ng over a large beaker to collect any mercury in the rinsings. Rinse the specimen free of any residual mercury with running Dry the specimen and weigh to the nearest 0.01 gram. Calculations. The hydrogen content is expressed in terms of mL/g of deposited weld metal. Volume of H2 gas at standard - 27
47、3 (P-H) Vo (273+T) (760) A= - temperature and pressure T = ambient temperature (OC) P = barometric pressure (mm Hg) V = measured volume in eudiometer H = see figure 5 mL A H2 content - = - g B-C where A = milliliters of H2 gas at STP calculated after 7 2 hours weld metal B = weight (in grams) of tes
48、t plate plus deposited C = weight (in grams) of test plate. The four values obtained for the hydrogen content and the average value, all rounded to the nearest 0.001 mL/g shall be reported.“ PAGE 11 4.6.7: Delete and substitute: 4.6.7 Unsatisfactory weld metal test results. If the results of the fir
49、st II tests involvirg weld metal are determined to be unsatisfactory one retest involving twice the number of specimens originally required may be permitted. The results of all tests shall be satisfactory for compliance with the weld metal test requirements. The retest weldments shall be made using electrodes from the same sampling or test lot as those of the initial test. If the retest is conducted to correct welding operator error, only the kind of tests that failed need
