AWS D18.1:2020 pdf download.Specification for Welding of Austenitic Stainless Steel Tube and Pipe Systems in Sanitary (Hygienic) Applications
This specification covers the requirements for gas tungsten are welding (GTAW) and plasma are welding (PAW) of stainless steel (ube and pipe 1/4 in [6 mm] diameter and larger in the fabrication and construction of new sanitary (hygienic) processing systems. This specification includes the welding of tube and pipe for the transportation of sanitary (hygienic) system products and cleaning or sanitizing solutions. It includes manual welding as well as mechanized or automatic welding, such as orbital welding. This specification addresses welding procedure and per-formance _qualification as well as visual examination requirements for as-welded surfaces and finished surfaces.
This specification is intended for new construction. However, the requirements may also be applied to maintenance and repair of food processing equipment. w hen there is a conflict between this specification and a design specifica-tion to which the equipment is being constructed, the applicable code shall govern on issues that apply to structural design or structural integrity. This specification does not address requirements designed to prevent corrosion damage during service or any structural design or integrity aspects of components or systems used for sanitary (hygienic) applications.
Sanitary processing systems are intended to include those systems handling products for human and animal consump-tion, or for cleaning and sanitizing solutions used in these systems. Such products include dairy, meat, poultry, vege-tables, beverages, personal care items (such as shampoo, soap, toothpaste, cosmetics), and other products consumed or used by humans or animals, which require freedom from contamination.When this speeification is stipulated in contract documents, conformance with all prov isions of this specification is required except provisions specifically modified or exempted by the Owner, their representative, or the contract documents.
1.2 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 | or in appropriate columns in tables and figures. The measurements may not be exact equivalents; therefore, each system must be used independently.
1.3 Safety. Safety and health issues and concerns are beyond the scope of this standard; some safety and health infor-mation is provided, but such issues are not fully addressed herein.
discoloration. Any change in surface color from that of the base metal, usually associated with OX idation. Discoloration may occur on the weld, heat-affected zone, or base metal of the weld joint such as a result of heating the metal during welding. Colors may range from pale bluish-gray to deep blue, and from pale straw color to a black crusty coating.AWS D18.1 pdf download.