1、Standard WeldingProcedureSpecification forNaval Applications(SWPS-N) for GasTungsten Arc Weldingof Austenitic StainlessSteel (S-8), 1/8 inch 3 mm through 1-1/2inch 38 mm Thick,MIL-3XX, in the As-Welded Condition,Primarily Pipe forNaval ApplicationsAWS-NAVSEA B2.1-8-318:2016An American National Stand
2、ardAWS-NAVSEA B2.1-8-318:2016An American National StandardApproved by theAmerican National Standards InstituteJanuary 26, 2016Standard Welding Procedure Specification for NavalApplications (SWPS-N) for Gas Tungsten Arc Welding ofAustenitic Stainless Steel (S-8), 1/8 inch 3 mm through1-1/2 inch 38 mm
3、 Thick, MIL-3XX, in the As-WeldedCondition, Primarily Pipe for Naval Applications1st EditionPrepared by theAmerican Welding Society (AWS) B2 Committee on Procedure and Performance QualificationUnder the Direction of theAWS Technical Activities CommitteeApproved by theAWS Board of DirectorsAbstractTh
4、is standard contains the essential welding variables for austenitic stainless steel in the thickness range of 1/8 inch 3 mm through 1-1/2 inch 38 mm, using manual gas tungsten arc welding. It cites the base metals and operating con-ditions necessary to make the weldment, the filler metal specificati
5、ons, and joint designs for groove and fillet welds. ThisSWPS-N was developed primarily for naval applications that require performance to NAVSEA Technical PublicationS9074-AQ-GIB-010/248, Requirements for Welding and Brazing Procedure and Performance Qualification.ISBN: 978-0-87171-881-5 2016 by Ame
6、rican Welding SocietyAll rights reservedPrinted in the United States of AmericaiiAWS-NAVSEA B2.1-8-318:2016Statement on the Use of American Welding Society StandardsAll standards (codes, specifications, recommended practices, methods, classifications, and guides) of the AmericanWelding Society (AWS)
7、 are voluntary consensus standards that have been developed in accordance with the rules of theAmerican National Standards Institute (ANSI). When AWS American National Standards are either incorporated in, ormade part of, documents that are included in federal or state laws and regulations, or the r
8、egulations of other governmen-tal bodies, their provisions carry the full legal authority of the statute. In such cases, any changes in those AWS standardsmust be approved by the governmental body having statutory jurisdiction before they can become a part of those laws andregulations. In all cases,
9、 these standards carry the full legal authority of the contract or other document that invokes theAWS standards. Where this contractual relationship exists, changes in or deviations from requirements of an AWS stan-dard must be by agreement between the contracting parties.AWS American National Stand
10、ards are developed through a consensus standards development process that bringstogether volunteers representing varied viewpoints and interests to achieve consensus. While the AWS administers theprocess and establishes rules to promote fairness in the development of consensus, it does not independe
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17、ficial interpretations of any of the technical requirements of this standard may only be obtained by sending a request,in writing, to the appropriate technical committee. Such requests should be addressed to the American Welding Society,Attention: Managing Director, Technical Services Division, 8669
18、 NW 36 St, # 130, Miami, FL 33166 (see Annex A).With regard to technical inquiries made concerning AWS standards, oral opinions on AWS standards may be rendered.These opinions are offered solely as a convenience to users of this standard, and they do not constitute professionaladvice. Such opinions
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20、te for an official interpretation.This standard is subject to revision at any time by the AWS B2 Committee on Procedure and Performance Qualification.It must be reviewed every five years, and if not revised, it must be either reaffirmed or withdrawn. Comments (recom-mendations, additions, or deletio
21、ns) that may be of use in improving this standard should be sent to AWS Headquarters.Any pertinent data supporting the comments are required. Such comments will receive careful consideration by the AWSB2 Committee on Procedure and Performance Qualification and the author of the comments will be info
22、rmed of theCommittees response to the comments. Guests are invited to attend all meetings of the AWS B2 Committee onProcedure and Performance Qualification to express their comments verbally. Procedures for appeal of an adverse deci-sion concerning all such comments are provided in the Rules of Oper
23、ation of the Technical Activities Committee. A copyof these Rules can be obtained from the American Welding Society, 8669 NW 36 St, # 130, Miami, FL 33166.iiiAWS-NAVSEA B2.1-8-318:2016This page is intentionally blankivAWS-NAVSEA B2.1-8-318:2016PersonnelAWS B2 Committee on Procedure and Performance Q
24、ualificationJ. L. Cooley, Chair J. C. therefore, each system must be used independently.Safety. Safety and health issues and concerns are beyond the scope of this standard and therefore are not addressedherein. Safety and health information is available from the following sources:American Welding So
25、ciety:(1) ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes(2) AWS Safety and Health Fact Sheets(3) Other safety and health information on the AWS websiteMaterial or Equipment Manufacturers:(1) Safety Data Sheets supplied by materials manufacturers(2) Operating Manuals supplied by equipme
26、nt manufacturersApplicable Regulatory AgenciesWork performed in accordance with this standard may involve the use of materials that have been deemed hazardous, andmay involve operations or equipment that may cause injury or death. This standard does not purport to address all safetyand health risks
27、that may be encountered. The user of this standard should establish an appropriate safety program toaddress such risks as well as to meet applicable regulatory requirements. ANSI Z49.1 should be considered when devel-oping the safety program.AWS-NAVSEA B2.1-8-318:2016Page 2 of 23Permission to reprod
28、uce for intra-company use only is granted by the American Welding SocietyStandard Welding Procedure Specification for NavalApplications (SWPS-N)LIMITATIONSThis procedure is not qualified for Notch Toughness or PWHT applications.WELDING PROCESSWelding Process: GTAW (Gas Tungsten Arc Welding)Method of
29、 Application: ManualBASE METALSBase Metal:1Austenitic Stainless Steel, S-8 to S-8 (See Table 1)Thickness Range: 1/8 in 3 mm through 1-1/2 in 38 mm for groove welds,3/16 in 5 mm minimum for fillet weldsPipe Diameter: All diametersCoating: UncoatedFILLER METALSFiller Metal Specification:2MIL-E-19933,
30、Electrodes and RodsWelding, Bare, Chromium andChromium-Nickel SteelsClassification: See Table 1 for allowable classificationsFiller Metal Grouping: A-8B in NAVSEA S9074-AQ-GIB-010/248 and A Number 8, F Number 6 inAWS B2.1/B2.1MDeposit Thickness Range: 1/8 in 3 mm through 1-1/2 in 38 mm maximum plus
31、reinforcement forgroove welds,3/16 in 5 mm through 1-1/2 in 38 mm fillet weld size for fillet weldsConsumable Inserts: Not permittedPenetration Enhancing Flux: Not permittedJOINT DESIGNSJoint Design: See Figure 1Backing: When required by Figure 1Backing Material:1Austenitic Stainless Steel, S-8 or w
32、eld metal of similar chemical analysis.Nonmetallic or nonfusing metal retainers are not permitted.POSITIONSPermitted Positions: AllVertical Progression: UphillAWS-NAVSEA B2.1-8-318:2016Page 3 of 23Permission to reproduce for intra-company use only is granted by the American Welding Society1S-8 base
33、metals are as detailed in NAVSEA S9074-AQ-GIB-010/248 (or approved by the Navy authorizedrepresentative). AWS B2.1/B2.1M includes a list of Navy approved S-8 materials.2Commercial filler metal may be used in place of MIL-E-19933 if purchased to the additional requirements specified inthe fabrication
34、 document(s).AWS-NAVSEA B2.1-8-318:2016Page 4 of 23Permission to reproduce for intra-company use only is granted by the American Welding SocietyStandard Welding Procedure Specification for NavalApplications (SWPS-N)PREHEAT AND INTERPASS TEMPERATURESPreheat Temperature: 60F 15C MinimumInterpass Tempe
35、rature: 60F 15C Minimum, 350F 175C MaximumPreheat Control: Shelter the weldment from wind and inclement weather during welding anduntil the weld area has cooled to a temperature no more than 50F 28Cabove ambient temperature. When using a gas flame for low temperaturepreheating, heat the material unt
36、il it is dry and warm to the touch.Preheat Maintenance: Continuous or special heating not requiredGASTorch Shielding Gas: Argon, or A5.32M/A5.32 (ISO 14175 MOD)-I1-Ar, or MIL-A-18455 ArgonTorch Shielding Gas 10 ft3/h 4.7 L/min to 25 ft3/h 11.8 L/minFlow Rate:Root Shielding Gas: It is not necessary t
37、o shield the root of fillet welds or groove welds with back-ing or backgouging. When used, Argon, or A5.32M/A5.32 (ISO 14175 MOD)-I1-Ar, or MIL-A-18455 Argon is to be used for root shielding (purge) gas. Gasshall remain in place until the joint is completed or at least 3/16 in 5 mm ofweld metal has
38、been deposited. When introducing root shielding gas to initiatethe purge, it is necessary to have at least 6 volume changes of atmospherewithin the purged zone prior to welding. As an alternative, the oxygen contentof the purge zone shall be 1% or less, as measured with an Oxygen Analyzer,prior to w
39、elding.Root ShieldingGas Flow Rate: A typical flow rate of 5 ft3/h 2.4 L/min to 15 ft3/h 7.1 L/min may be useddepending on component configuration.Torch Gas Nozzle Size: 1/4 in 6 mm to 3/4 in 19 mm inside diameterTrailing Gas: NoneTUNGSTEN ELECTRODESType: AWS A5.12M/A5.12 (ISO 6848 MOD) EWTh-2, EWCe
40、-2, or EWLa-1.5Size: 1/16 in 1.6 mm through 1/8 in 3.2 mm diameterPOSTWELD HEAT TREATMENTPostweld Heat Treatment: None (Not qualified for PWHT applications).ELECTRICAL CHARACTERISTICSGROOVE WELDS AND FILLET WELDSElectrode CurrentBeads or Layers ClassificationaDia. in mm AmperesbPolarityTack, MIL-3XX
41、 1/16 1.6 50100 DCEN (Straight)Root, MIL-3XX 3/32 2.4 70120 DCEN (Straight)Fill MIL-3XX 1/8 3.2 90140 DCEN (Straight)a See Table 1 for allowable classifications.b Values not to exceed capacity of tungsten electrodes.Pulsing Current: Not permittedTECHNIQUEWeave or Stringer Bead: Either. Width of weav
42、e beads is limited to 1/2 in 13 mm.Peening: Not required. If used, proceed as permitted by the fabrication document(s).Initial Cleaning: Chemical or mechanical; joint shall be dry prior to welding. The joint members tobe welded, including the base metal surfaces, shall be cleaned to remove foreignma
43、terial for a minimum of 1 in 25 mm from the weld edge. Mill scale or metallicoxides shall be removed from surfaces on which weld metal will be deposited.Interpass Cleaning: Mechanical only. Weld metal and adjacent surfaces shall be cleaned prior todepositing subsequent passes or layers and upon comp
44、letion of the weld.Backgouging: Mechanical or thermal when used. Before applying weld metal on the reverseside of double-welded joints, the joint shall be (1) prepared for welding bychipping, grinding, machining, or arc gouging to remove all unsound metaland (2) contoured for access and cleaned, and
45、 inspected per NAVSEATechnical Publication T9074-AS-GIB-010/271, Requirements forNondestructive Testing Methods, to assure a sound weld.Single or Multiple Passes: Either. A minimum of two weld layers are required for (a) all pressure contain-ing weld joints and (b) each side of tank boundary fillet
46、weld joints.Maximum Bead Thickness: 1/4 in 6 mmRepair: Defects in welds shall be removed by mechanical or arc gouging methods andthe excavation inspected per the fabrication document. The repair cavity maydiffer in contour and dimension from a normal joint preparation and maypresent different restra
47、int conditions. Repair of base metal defects shall be inaccordance with the requirements of the fabrication document(s).AWS-NAVSEA B2.1-8-318:2016Page 5 of 23Permission to reproduce for intra-company use only is granted by the American Welding SocietyStandard Welding Procedure Specification for Nava
48、lApplications (SWPS-N)Table 1Base Metal and Corresponding Filler Metal ClassificationsBase Metal Grade or Type Corresponding MIL-Type or Classification304, CF8 MIL-308, MIL-308L, MIL-309, ER309L304L, CF3 MIL-308L, ER309L316, CF8M MIL-316, MIL-316L316L, CF3M MIL-316L321 MIL-321347, CF8C MIL-347348 MI
49、L-347Notes:1 The specific filler metal classification from the table above or any other filler metal classification conforming to MIL-3XXmay be used when specified by the fabrication document(s).2 When two different base metal grades or types listed above are being joined, a filler metal classification permitted foreither base metal grade or type, or as specified by the fabrication document(s), may be used.3ER309L classification to AWS A5.9/5.9M, Specification for Bare Stainless Steel Welding Electrodes and Rods. S
