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 Pipe for Naval ApplicationsSite LicenseAWS-NAVSEA B2.1-1-311:2018An Amer
2、ican National StandardAWS-NAVSEA B2.1-1-311:2018An 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 through 1-1/2 i
3、nch 38 mm Thick, MIL-70S-2, in the As-Welded or PWHT Condition, 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
4、 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, the filler metal specif
5、ications, 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-NAVSEA B2.1-1-311:2018I
6、SBN: 978-0-87171-936-2 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, recording, or otherwise, wit
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25、r 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 B2.1-1-311:2018iiiThis page is intenti
26、onally blankivAWS-NAVSEA B2.1-1-311:2018PersonnelAWS 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 therefore are not addressed
27、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 Equipment Manufacturers:(1
28、) 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 operations or equipment tha
29、t 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 Z49.1 should be consi
30、dered when develop-ing the safety program.AWS-NAVSEA B2.1-1-311:2018Page 3 of 24Permission 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 qualified for Notch To
31、ughness 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,3/16 in 5 mm minimum for fillet weldsPipe Diameter: All diametersCoatin
32、g: UncoatedFILLER 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
33、Thickness Range: 1/8 in 3 mm through 1-1/2 in 38 mm maximum plus reinforcement for groove 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 require
34、d by Figure 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 Nav
35、y authorized 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 B2.1-1-311:2018Page 4 of 24Permission t
36、o reproduce 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 Inte
37、rpass TemperatureMaximum 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.
38、3 wt % require 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
39、be required 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
40、CEN VALUES GREATER THAN 0.43CEN Material Specification Type or Grade0.43CEN 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 BMI
41、L-C-24707/1 Grade A1QMIL-C-24707/1 Grade WCBWW-P-404 Grade B3Carbon 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 pl
42、us 75% of the specified range for that element.AWS-NAVSEA B2.1-1-311:2018Page 5 of 24Permission to reproduce for intra-company use only is granted by the American Welding SocietyStandard Welding Procedure Specification for Naval Applications (SWPS-N)Preheat Control: Shelter the weldment from wind an
43、d 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 material until it is dry and warm to the touch.Preheat/InterpassTemperature Maintenance: Preheat and
44、interpass 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 1
45、4175 MOD)-I1-Ar, or MIL-A-18455 ArgonTorch Shielding GasFlow 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 backing or backgouging. When used, Argon, or AWS A5.32M/A5.32 (ISO 14175 MOD)-I1-Ar, or MIL-A-18
46、455 Argon is 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
47、the purged zone 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 used depending on component configur
48、ation.Torch Gas Nozzle Size: 1/4 in 6 mm to 3/4 in 19 mm inside diameter.Trailing 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-wel
49、ded or postweld 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 post weld heat treated at a temperature at least 50F 28C but not more than 100F 56C below the tem
