AWS B2.1-1-311 pdf free download

AWS B2.1-1-311 pdf free download.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 Applications.
Supplementary Instructions. To adapt this SWPS-N to a specific application, a user may issue supplementary instructions. Such instructions may consist of tighter fit-up tolerances, higher minimum preheat temperature, or any other instructions necessary to produce a wcldmcnt that meets the requirements of the fabrication document(s). These instructions shall not be less restrictive than provided in the SWPS-N.
Nomenclature Caution. The base material S numbers appearing in this standard are base material groupings used for qualification purposes in NAVSEA Technical Publication S9074-AQ-(IIB-OlO/248. just as M numbers inAWS B2.1/B2M and P numbers in the ASME Pressure Vessel Code are material groupings. The S numbers in this standard are different from and not to be confused with the S number nomenclature that has been used in the ASME Pressure Vessel Code. The P number joint designations and P piping classifications in this standard have no association with the ASME P number material groupings. The A number suffix letter filler metal grouping in this standard is that included in NAVSEA Technical Publication S9074-AQ-(IIB-0 10/248 and should not be confused with the A number weld metal groupings included in AW S 132. 1/132. 1 M or in A SME Boiler and Pressure Vessel Code, SL’cIio,l IX, Welding. Brazing, and Fusing Quail/lea (ions.
Standard Units of Measure. This standard makes use of both U.S. Customary Units and the International System of Units (SI). The latter are shown within brackets ([j) or in appropriate columns in tables and figures. The measurements may not be exact equivalents; therefore, each system must be used independently.
Either. Width of weave beads is limited to 1/2 in [13 mm]. Not required. If used, proceed as permitted by the fabrication document(s). Chemical or mechanical; joint shall be dry prior to welding. The joint members to be welded, including the base metal surfaces, shall be cleaned to remove foreign material for a minimum of 1 in [25 mm] from the weld edge. Mill scale or metallic oxides shall be removed from surfaces on which weld metal will be deposited.
Mechanical only. Weld metal and adjacent surfaces shall be cleaned prior to depositing subsequent passes or layers and upon completion of the weld. Thermal and/or mechanical when used. Before applying weld metal on the reverse side of double-welded joints, the joint shall be (1) prepared for welding by chipping, grinding, machining, or arc gouging to remove all unsound metal, and (2) contoured for access and cleaned per the applicable fabrication document, and inspected per NAVSEA Technical Publication T9074-AS-GIB-O1O/271, Requirements for Nondestructive Testing Methods, to assure a sound weld.
Either. A minimum of two weld layers are required for (a) all pressure containing weld joints, and (b) each side of tank boundary fillet weld joints. 1/4 in [6 mm]
Defects in welds shall be removed by mechanical or arc gouging methods and the excavation inspected per the fabrication document. The repair cavity may differ in contour and dimension from a normal joint preparation and may present different restraint conditions. Repair of base metal defects shall be in accordance with the requirements of the fabrication document(s).AWS B2.1-1-311 pdf download.