1、Standard Welding Procedure Specification for Naval Applications (SWPS-N) for Gas Tungsten Arc Welding of Carbon Steel (S-1), 1/8 inch 3 mm through 1-1/2 inch 38 mm Thick, MIL-70S-2, in the As-Welded or PWHT Condition, Primarily Plate and Structural Naval ApplicationsSite LicenseAWS-NAVSEA B2.1-1-301
2、:2018An American National StandardAWS-NAVSEA B2.1-1-301:2018An American National StandardApproved by theAmerican National Standards InstituteFebruary 16, 2018Standard Welding Procedure Specification for Naval Applications (SWPS-N) for Gas Tungsten Arc Welding of Carbon Steel (S-1), 1/8 inch 3 mm thr
3、ough 1-1/2 inch 38 mm Thick, MIL-70S-2, in the As-Welded or PWHT Condition, Primarily Plate and Structural Naval Applications1st EditionPrepared by theAmerican Welding Society (AWS) B2 Committee on Procedure and Performance QualificationUnder the Direction of theAWS Technical Activities CommitteeApp
4、roved by theAWS Board of DirectorsAbstractThis standard contains the essential welding variables for carbon 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 conditions necessary to make the weldment,
5、 the filler metal specifications, and joint designs for groove and fillet welds. This SWPS-N was devel-oped primarily for naval applications that require performance to NAVSEA Technical Publication S9074-AQ-GIB-010/248, Requirements for Welding and Brazing Procedure and Performance Qualification.AWS
6、-NAVSEA B2.1-1-301:2018ISBN: 978-0-87171-935-5 2017 by American Welding SocietyAll rights reservedPrinted in the United States of AmericaPhotocopy Rights. No portion of this standard may be reproduced, stored in a retrieval system, or transmitted in any form, including mechanical, photocopying, reco
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8、ided that the appropri-ate fee is paid to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, tel: (978) 750-8400; Internet: .iiStatement on the Use of American Welding Society StandardsAll standards (codes, specifications, recommended practices, methods, classifications, and guid
9、es) of the American Welding Society (AWS) are voluntary consensus standards that have been developed in accordance with the rules of the American National Standards Institute (ANSI). When AWS American National Standards are either incorporated in, or made part of, documents that are included in fede
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22、nofficial opinions or interpretations of AWS. In addition, oral opinions are informal and should not be used as a substitute 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 f
23、ive years, and if not revised, it must be either reaffirmed or withdrawn. Comments (recom-mendations, additions, or deletions) and any pertinent data that may be of use in improving this standard are requested and should be addressed to AWS Headquarters. Such comments will receive careful considerat
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25、rbally. Procedures for appeal of an adverse decision concerning all such com-ments are provided in the Rules of Operation of the Technical Activities Committee. A copy of these Rules can be obtained from the American Welding Society, 8669 NW 36 St, # 130, Miami, FL 33166.AWS-NAVSEA B2.1-1-301:2018ii
26、iThis page is intentionally blankAWS-NAVSEA B2.1-1-301:2018ivPersonnelAWS B2 Committee on Procedure and Performance QualificationJ. 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 therefo
27、re are not addressed herein. Safety and health information is available from the following sources:American Welding Society:(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 Equip
28、ment Manufacturers:(1) Safety Data Sheets supplied by materials manufacturers(2) Operating Manuals supplied by equipment manufacturersApplicable Regulatory AgenciesWork performed in accordance with this standard may involve the use of materials that have been deemed hazardous, and may involve operat
29、ions or equipment that may cause injury or death. This standard does not purport to address all safety and health risks that may be encountered. The user of this standard should establish an appropriate safety program to address such risks as well as to meet applicable regulatory requirements. ANSI
30、Z49.1 should be considered when develop-ing the safety program.AWS-NAVSEA B2.1-1-301:2018Page 3 of 22Permission to reproduce for intra-company use only is granted by the American Welding SocietyStandard Welding Procedure Specification for Naval Applications (SWPS-N)LIMITATIONSThis procedure is not q
31、ualified for Notch Toughness applications.WELDING PROCESSWelding Process: GTAW (Gas Tungsten Arc Welding)Method of Application: ManualBASE METALSBase Metal:1Carbon Steel, S-1 to S-1Thickness Range: 1/8 in 3 mm through 1-1/2 in 38 mm for groove welds,1/8 in 3 mm minimum for fillet weldsCoating: Uncoa
32、tedFILLER METALSFiller Metal Specification:2MIL-E-23765/1, Electrodes and RodsWelding, Bare, Solid and Alloyed Cored, Ordinary Strength and Low Alloy SteelClassification: MIL-70S-2Filler Metal Grouping: A-2B in NAVSEA S9074-AQ-GIB-010/248 and A Number 1, F Number 6 in AWS B2.1/B2.1MDeposit Thickness
33、 Range: 1/8 in 3 mm through 1-1/2 in 38 mm maximum plus reinforcement for groove welds,1/8 in 3 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
34、 1Backing Material: Carbon steel, S-1 or weld metal of similar chemical analysis. Nonmetallic or nonfusing metal retainers are not permitted.POSITIONSPermitted Positions: AllVertical Progression: Uphill1S-1 base metals are as detailed in NAVSEA S9074-AQ-GIB-010/248 (or approved by the Navy authorize
35、d representative). AWS B2.1/B2.1M includes a list of Navy approved S-1 materials with CEN 0.43.2Commercial filler metal may be used in place of MIL-70S-2 if purchased to the additional requirements specified in the fabrication document(s).AWS-NAVSEA B2.1-1-301:2018Page 4 of 22Permission to reproduce
36、 for intra-company use only is granted by the American Welding SocietyStandard Welding Procedure Specification for Naval Applications (SWPS-N)PREHEAT AND INTERPASS TEMPERATURESPreheat Temperature: See TableInterpass Temperature: See TableBase Metal Thickness, in mmMinimum Preheat and Interpass Tempe
37、ratureMaximum Interpass TemperatureBase Metals with Carbon Equivalents (CEN) 0.43Base Metals with Carbon Equivalents (CEN) 0.43t 1.25 32 60Fa,b15C 125Fa,b52C 500F 260C1.25 32 t 1.5 38 60Fa,b15C 175Fb80C 500F 260CaS-1 steels greater than 1 in 25 mm thick with carbon content greater than 0.3 wt % requ
38、ire a 175F 80C minimum preheat and interpass temperature.bPreheat and interpass temperatures are based on the thicker member when joining different thicknesses.Note: Preheat and interpass temperatures must be sufficient to prevent crack formation. Temperatures above the minimum shown may be required
39、 for highly restrained welds. The following table lists the only S-1 base materials with CEN3values greater than 0.43 that are approved for use with this procedure. Other S-1 materials approved for use with this procedure have CEN values less than or equal to 0.43.S-1 BASE MATERIALS WITH CEN VALUES
40、GREATER THAN 0.43CEN Material Specification Type or Grade0.43 CEN 0.54MIL-S-15083 Class 65-35MIL-F-20670MIL-S-24093 Type IVMIL-S-24238 Grade CMIL-P-24338MIL-C-24707/1 Grade A2QMIL-C-24707/1 Grade WCCASTM A216 Grade WCBASTM A234 Grade WPBMIL-S-23194 Grade CMIL-F-24339MIL-P-24691/1 Grade BMIL-C-24707/
41、1 Grade A1QMIL-C-24707/1 Grade WCBWW-P-404 Grade BPreheat Control: Shelter the weldment from wind and inclement weather during welding and until the weld area has cooled to a temperature no more than 50F 28C above ambient temperature. When using a gas flame for low temperature preheating, heat the m
42、aterial until it is dry and warm to the touch.3Carbon equivalent (CEN) for S-1 base materials can be calculated using the formula: CEN = C + 0.75 + 0.25 tanh 20 (C 0.12)Si/24 + Mn/6 + Cu/15 + Ni/20 + (Cr + Mo + Nb + V)/5 + 5B, where the value for each element is the specified minimum plus 75% of the
43、 specified range for that element.AWS-NAVSEA B2.1-1-301:2018Page 5 of 22Permission to reproduce for intra-company use only is granted by the American Welding SocietyStandard Welding Procedure Specification for Naval Applications (SWPS-N)Preheat/InterpassTemperatureMaintenance: Preheat and interpass
44、temperature may be reduced to ambient during welding provided preheat is reapplied prior to resumption of welding. At the completion of welding, preheat or interpass temperature may be reduced to ambient prior to any subsequent PWHT.GASTorch Shielding Gas: Argon, or AWS A5.32M/A5.32 (ISO 14175 MOD)-
45、I1-Ar, orMIL-A-18455 ArgonTorch ShieldingGas Flow Rate: 10 ft3/h 4.7 L/min to 25 ft3/h 11.8 L/minRoot Shielding Gas: It is not necessary to shield the root of fillet welds or groove welds with backingor backgouging. When used, Argon, or AWS A5.32M/A5.32 (ISO 14175 MOD)-I1-Ar, or MIL-A-18455 Argon is
46、 to be used for root shielding (purge) gas. Gas shall remain in place until the joint is completed or at least 3/16 in 5 mm of weld metal has been deposited. When introducing root shielding gas to initiate the purge, it is necessary to have at least 6 volume changes of atmosphere within the purged z
47、one prior to welding. As an alternative, the oxygen content of the purge zone shall be 2% or less, as measured with an Oxygen Analyzer, prior to welding.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 configurationTorch Ga
48、s 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-2, or EWLa-1.5Size: 1/16 in 1.6 mm through 1/8 in 3.2 mm diameterPOSTWELD HEAT TREATMENTPostweld Heat Treatment: Welds may either be as-welded or postweld
49、 heat treated. Postweld heat treat when required by the fabrication document or contract. Heat treat at 1100F 595C to 1250F 675C. If heat treated, the heat treatment time shall be 1 hour per inch 25 mm of thickness (30 minutes minimum) unless otherwise noted in the fabrication document. If heat treated, materials that have been normalized and tempered shall be postweld heat treated at a temperature at least 50F 28C but not more than 100F 56C below the tempering temperatu
