NAVY MIL-E-17777 D-1984 ELECTRODES CUTTING AND WELDING CARBON-GRAPHITE UNCOATED AND COPPER-COATED《无覆盖物和铜覆盖的碳石墨电极切断和焊接法》.pdf

1、flIL-E-37777D 34 M 9777706 0245388 2 MIL-E- 17 777 C 9 August 1974 (See 6.4) MILITARY SPECIFICATION ELECTRODES, CUTTING AND WELDING, CARBON-GRAPHITE, UNCOATED AND COPPER-COATED This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1,I Scope. Th

2、is Specification covers round section uncoated (plain) carbon-graphite electrodes for arc-welding, round, half-round and rectangular section copper-coated carbon-graphite electrodes for air carbon-arc cutting, and round section jointed copper-coated carbon-graphite electrodes for air carbon-arc cutt

3、ing. 1.2 Classification. The electrodes shall be furnished in ehe types and sizes shown in table I, as specified (see 6.2.1). MIL-C MIL- CuC-A TABLE 1. Typ es and sizes. Round carbon-graphite (plain-uncoated) carbon-graphite Beneficial comments (recommendations, additions, deletions) and any pertine

4、nt data which may he of use in improving this document should be addressed to: Commander, Naval Sea Systems Commana, SEA 5523, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document o

5、r by etter, D .FSC 3439 -. THIS DOCUMENT CONTAINS /g PAGES. . _ - Licensed by Information Handling ServicesType MIL-CuC-B MIL-CUC-C MIL-CUC-D MIL-E-17777D 34 m 7777906 0245189 4 m MIL-E-17777D TABLE I. Types and Description Half-round copper-coated carbon-graphite Round copper-coa ted- carbon-graphi

6、te with machined lock- joint ends - Rectangular copper-coated carbon-graphite 2. APPLICABLE DOCUMENTS 2.1 Government documents. sizes. - Continued Nominal size (inches) Cross- Diamet er section Length 318, 112, 518 Semi- 18 circular 5/16, 318 Circular 12 112 14 518 15 314, 1 17 . 5132x31 8 12 3/16x5

7、/8 2.1.1 Specifications and standards. Unless otherwise specified, the fol- lowing specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent

8、specified herein. SPECIFICATIONS FEDERAL PPP-B-5 66 PPP-B -5 7 6 PPP-B-5 85 PPP-B-591 PPP-B-6 O1 PPP-B-621 PPP-B-636 PPP-B-640 PPP-B-665 PPP-B-67 6 - Boxes, Folding, Paperboard. - Boxes, Wood, Cleated, Veneer, Paper Overlaid. - Boxes, Shipping, Wood, Wirebound. - Boxes, Fiberboard, Wood-Cleated. - B

9、oxes, Wood, Cleated-Plywood. - Boxes, Wood, Nailed and Lock-Corner. - Boxes, Shipping, Fiberboard. - Boxes, Fiberboard, Corrugated, Triple-Wall. - Boxes: Paperboard, Metal Edged and Components. - Boxes, Setup. . MILITAKY MIL-L-10547 - Liners, Case, and Sheet, Overwrap; Water-Vaporproof or Waterproof

10、, Flexible. Licensed by Information Handling ServicesMIL-E-17777D STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-147 - Palletized Unit Loads. Attributes. 2.1.2 Other Government documents. The following other G

11、overnment docu- ment forms a part of this specification to the extent specified herein. DEPARTKENT OF LABOR Code of Federal Regulations, Title 29 Part 1910 - Occupational Safety and Health Standards (Application for copies should be addressed to the Superintendent of Documents, U.S. Government Print

12、ing Office, Washington, DC 20402.) (Copies of specifications and standards required by contractors in connec- tion with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form a p

13、art of this specification to the extent specified herein. The issues of the documents which aie indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. AMERICAN WELDING SOCIETY (AWS) A3.0 - AWS Definitions - Welding and Cutting. 249-1 - Saf

14、ety in Welding and Cutting (Application for copies should be addressed to the American Welding Society, Iuc., 550 NW LeJeune Road, P.O. Box 351040, Miami, FL 33125.) NATIONAL MOTOR FREIGHT TRAFFIC ASSOCIATION, INC AGENT National Motor Freight Classification (Application for copies should be addresse

15、d to the National Motor Freight Traffic Association, Inc., ATA TRAFFIC Dept., 1616 “P“ Street, N.W., Washington, DC 20036.) NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) EW 1 - Electric Arc-Welding Apparatus. (Application for copies should be addressed to National Electrical Manu- facturers A

16、ssociatton, 2101 “L“ Street, NW, Washington, DC 20037.) UNIFORl4 CLASSIFICATION COMMITTEE AGENT Uniform Freight Classification Ratings, Rules and Regulations (Application for copies should be addressed to the Uniform Classification Committee Agent, Tariff Publication Officer, Room 1106, 222 South Ri

17、verside Plaza, Chicago, IL 60606.) 3 Licensed by Information Handling ServicesMIL-E-37777D 34 7777706 0245373 2 U MIL-E-17777D (Industry association specifications and standards are generally available They are also distributed among technical groups for reference from libraries. and using Federal a

18、gencies.) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specifica- tion shall take precedence. 3. REQUIREMENTS 3.1 Definitions. For the purpose of this specification, the welding terms and definitions cont

19、ained in AWS A3.0 shall apply. 3.2 Dimensional tolerances. 3.2.1 Length. The length of the electrodes shall be not less than the nominal length. 3.2.2 Diameter. The diameter of the electrodes shall vary not more than plus or minus 5 percent from the nominal diameter. 3.2.3 Thickness and width. For t

20、he rectangular cross-section electrodes, type MIL-CuC-D, the dimensions “a“ (thickness) and “b“ (width) shall not vary more than plus or minus 5 percent from the nominal dimensions. 3.2.4 Straightness. The electrodes shall not deviate more than 1/2 percent of length as measured in 4.3.2.2. 3.2.5 Tap

21、er. 3.2.5.1 Types MIL-C and MIL-CuC-A electrodes other than 1/8 inch diameter shall have one end tapered approximately 30 degrees with the axis of the elec- trode. The diameter of the point shall be 1/16-inch minimum. 3.2.5.2 Type MIL-CuC-C electrode shall have both ends machined to a matching taper

22、 to provide a self-holding joint (electrode to electrode) with sufficiently close tolerance to permit use without stub loss in excess of the performance requirements specified in 3.5.3. 3.3 Copper coating. Coated electrodes shall have a copper coating 0.003 + 0.0015 inch deposited on all surfaces ex

23、cept on the machined joint surfacs of type MIL-CuC-C and the tapered end of type MIL-CuC-A. 3.4 Resistivity. The resistivity of all types of electrodes shall be The copper-coated electrodes shall have the not more than 0.0010 ohm inch. copper removed for the test of 4.4.2. 3.5 Performance requiremen

24、ts. 3.5.1 Type MIL-C electrodes, performance tested in accordance with 4.4.3, shall not spa11 nor crack during use or subsequent cooling. O a a ? Licensed by Information Handling ServicesMIL-37777D 39 m 9979906 0245392-4 m MIL-E-17777D 3.5.2 Types MIL-CuC-A, MIL-CuC-B and MIL-CuC-D electrodes, perfo

25、rmance tested in accordance with 4.4.3, s.hall: (a) (b) (c) not spall during use or subsequent cooling, not have more than 15 percent of the remaining copper surface not have an average copper burn back in excess of 3-1/2 inches blistered, per electrode measured to the nearest: 1/8-inch. burn back i

26、s the distance from the tip of the burned electrode to the copper coating. The copper 3.5.3 Type MIL-CuC-C electrodes, performance tested in accordance with 4.4.3, shall: (a) not spall during use or subsequent cooling, (b) (c) not have more than 15 percent of the remaining copper surface (d) not hav

27、e a stub loss more than 1-1/2 rod diameters, blistered, per electrode measured to the nearest 1/8-inch. tive copper burn back ia the distance from the tip of the burned rod to the copper coating. not have an average copper burn back in excess of 3-1/2 inches The cumula- 4. QUALITY ASSURANCE PROVISIO

28、NS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or

29、 any other facilities suitable for the performance of the inspection require- ments specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specifi- cation where such inspections are deemed necessary to assure suppl

30、ies and services conform to prescribed requirements. 4.2 4.2.1 Inspection lotc Sampling for quality conformance inspection. 4.2.1.1 Containers. For the purpose of sampling and inspection of con- tainers, all packaging and packing offered to one consignee for delivery at one time shall be considered

31、a lot. 4.2.1.2 Electrodes. For the purpose of sampling and inspection, all electrodes of one type and size produced from one batch mix and offered for delivery at one time shall be considered a lot. 4.2.2 Sampling for examination of containers. A random sample of ship- ping containers filled with pa

32、ckages of electrodes shall be selected in ac- cordance with MIL-STD-105 at inspection level S-1 and an acceptable quality level (AqL) of 2.5 percent to verify compliance with 4.3.1. The number of shipping containers shall be the lot size. Upon satisfactory completion of Licensed by Information Handl

33、ing ServicesMIL-E-17777D examination of filled shipping containers, a representative sample of the filled packages shall be selected in accordance with MIL-STD-105 at inspection level S-1 ard an AQL of 2.5 percent. The sample shall be examined for confor- mance to 4.3.1. 4.2.3 Sampling for examinati

34、on of electrodes. A random sample of elec- trodes shall be selected in accordance with MIL-STD-105 at inspection level S-1 and an AQL of 2.5 percent. The samples shall be examined for uniformity, dimensional tolerances, straightness and taper specified in 4.3.2 through 4.3.2.3.2. 4.2.4 Sampling for

35、tests. Four electrodes shall be selected from the samples of 4.2.3 and subjected to the copper coating and resistivity tests specified in 4.4.1 and 4.4.2. Four additional electrodes shall be selected from the samples of 4.2.3 and subjected to the applicable test specified in 4.4.3. 4.3 Quality confo

36、rmance inspection. 4.3.1 Examination of packaging and packing. Each of the containers, both outer shipping containers and unit packages, in a sample selected in accordance with 4.2.2 shall be examined for defects of construction, for unsatisfactory markings, and for compliance with the requirements

37、specified in section 5. 4.3.2 Examination of electrodes (visual and dimensional). Each of the sample electrodes selected in accordance with 4.2.3 shall be examined as speci- fied in 4.3.2.1 through 4.3.2.3. 4.3.2.1 Dimensional tolerances. The length and diameter of each of the electrodes selected in

38、 accordance with 4.2.3 shall be measured to determine conformance with 3.2.1, 3.2.2 and 3.2.3, respectively. 4.3.2.2 Straightness. The straightness (see 3.2.4) shall be verified by laying the electrode upon a surface plate or other smooth level surface and rolling it. gapping or separation between t

39、he two members. with a thickness gage to determine conformance with 3.2.4. During rotation, it shall be observed to determine the extent of Any separation shall be measured 4.3,2.3 Taper. 4.3.2.3.1 Types MIL-C and MIL-CuC-C electrodes shall be measured to determine taper angle and point diameter in

40、conformance wich 3.2.5.1. 4.3.2.3.2 ance with 3.2.5.2. Type MIL-CuC-C electrode taper shall be evaluated for compli- 4.4 Tests. 4.4.1 Copper coating. For coated electrodes, coating thickness shall be measured by stripping the copper coating at the center and both ends of the electrodes and measuring

41、 the foil peelings or by measuring the bare and covered cross sections and dividing by two. Extent of copper coating and thickness shall meet the requirements specified in 3.3. - Licensed by Information Handling ServicesMIL-E-17777D -_ 4.4.2 Resistivity. The resistivity of all types of electrodes sh

42、all be measured by the voltmeter-ammeter method as specified in 4.4.2.1 through 4.4.2.4 for conformance to 3.4. 4.4.2.1 Equipment. The following equipment shall be used: (a) Source of direct current (d.c.) providing a range of 6 volts (V) and 15 amperes (A) (for example, storage battery and variable

43、 resistance). (b) Voltmeter. For the range of 5 to 200 millivolts (mV), a d.c. millivoltmeter having three scales of O to 20, O to 50, and O to 200 mV, or equivalent, shall be used. For the range of 0.4 to 20 mV, a d.c. millivoltmeter having four scales of O to 2, O to 5, O to 10 and O to 20 mV, or

44、equivalent, shall be used. (c) Ammeter. A d.c. ammeter having three scales of O to 1.5, O to 3.0, and O to 15, or equivalent, shall be used. (d) Resilient contact surfaces such as silver plated copper gauze with a backing of resilient insulating material at least 0.25-inch thick. distance accurate t

45、o plus to minus 1/64-inch shall be used to obtain voltage measurement. (e) Sharp potential pointers arranged so as to contact a measured 4.4.2.2 Test specimen. The copper coating shall be removed from the sample coated electrodes. Both ends of sample electrodes shall be cut through a full cross sect

46、ion perpendicular to the longitudinal axis. 4.4.2.3 Procedure. The test shall be conducted at 75 + 15 degrees Fahrenheit (OF). trode through resilient contact surfaces. and meters selected so that the meter reading for the voltage drop across the 2-inch gage length and the current through the electr

47、ode will be at least 1/10 of the scale from either end of the range. Simultaneous voltage drop and current readings shall be made and recorded. A voltage shall be applied across the endsof the test elec- The applied voltage shall be adjusted 4.4.2.4 Calculation. The resistivity shall be calculated i

48、n accordance with the following formula: Round K = 3.1416R2E dI Half round Rectangular K = 3.1416R2E 2dI K = abE - dI Where: K = resistivity (ohm inch). R = radius of electrode (inches). E = voltage drop between potential pointers in V. d = gage length of potential pointer (inches). I = current thro

49、ugh specimen in A. a = thickness. b = width. 7 Licensed by Information Handling ServicesMIL-E-17777D 34 7777706 0245395 T MIL-E-17777D 4.4.3 Performance tests. Each of the our electrodes selected in accor- dance with 4.2-4 shall be subjected to the applicable test specified in 4.4.3.3. 4.4.3.4, or 4.4.3.5 for conformance to the requirements of 315. 4.4.3.1 Welding equipment. Welding machines used for supply power for testing electrodes shall be variable voltage d.c. motor-generator type or vari- able voltage d.c. welder conforming to NEMA EW 1. The power source shall be of