AWS D18.3/D18.3M pdf free download

AWS D18.3/D18.3M pdf free download.Welding of Tanks, Vessels, and Other Equipment in Sanitary (Hygienic) Applications.
product contact surface (PCS). Any surface that is exposed to the product or any surface from which materials may drain, drop. or be drawn into the product.
qualification variable (performance). A variable in which a change beyond that described in 4.2.8 is considered to affect the ability of the welder or welding operator to make an acceptable weld. (Previously referred to as essential variable.)
qualification ariahle (procedure). A variable in which a change beyond that described in 4.1 .6 is considered to affect the mechanical propeies of the weldment, and shall require requalifleation of the Welding Procedure Specification (WPS). (Previously referred to as essential variable.)
surface classification iones.
Zone I: Product Contact Surface (PCS)
Zone 2: Non-Product Contact Surface—Exposed (NPCS-E>——beyond the normal PCS where normal operations (i.e.. draining, tilling. etc.) pose a significant risk of incidental contamination.
Zone 3: Non-Product Contact Surface—Remote (NPCS-R)——remotely beyond the normal PCS where normal operations (i.e., draining, filling. etc.) pose a minimal risk of incidental contamination.
Zone 4: Non-Exposed Surface (NES) with significantly reduced likelihood of resulting in product contamination. The surface classification zone(s) will be based on the zone(s) encountered in production (see Figure 1).
verification test (performance). A sample weldment representative of production welding conditions, intended to confirm the welder’s or welding operator’s ability to meet the visual inspection requirements of visual examination acceptance criteria in 6.2.
verification variable. A variable in which a change as described in 4.1.6 may prevent the weld from meeting the acceptance criteria in 6.2.
weld finishing. A postweld process that leaves the weld area in a different condition than as welded. Finishing processes include, hut are not limited to, mechanical (e.g.. grinding, polishing, bead blasting), chemical (passivating or pickling). or electrochemical (electropol ishing).
welding variable. Any controllable detail of a welding procedure which is required to be addressed on the WPS. (Includes the definitions previously referred to as essential and nonessential variables.)
4. Qualification
4.1 Procedure Qualification
4.1.1 A written qualified WPS shall be followed for each weld in sanitary applications. The WPS may be in any convenient format provided all the welding variables of 4.1 . are recorded. A sample WPS form is shown in Annex II.
4.1.2 Standard Weldin.g Procedure Specifications (SWPSs) and welding procedures qualified to AWS B2. 1/82.1 M or earlier editions of this document may be used provided all data required by the late%1 edition of this document and AWS B2. I/B2.l M are addressed, and a successful documented verification test is performed to ensure the visual examination criteria of the document are met.
4.1. The welding variables required to he addressed for each procedure shall he those specifIed in 4.1 ..
4.1.4 The evaluation of procedure qualification test weldments shall be as listed in 4.1.4.1 through 4.1.4.4. The actual welding variables used during the qualification tests shall be recorded in addition to the results of the destructive and visual examination. The welding Procedure Qualification Record (POR) may be in any convenient format provided all the welding variables of 4.1 . and the results of all tests are recorded.AWS D18.3/D18.3M pdf download.