What is the specification of a suitable FCAW filler material for joining ASTM A516 Gr.55?

The selection of filler materials for welding processes such as Flux-Cored Arc Welding (FCAW) must comply with specific standards that correspond to the base material being welded. ASTM A516 Gr.55 is a carbon steel specification commonly used for pressure vessels and boiler applications, with a focus on having sufficient toughness at lower temperatures.

The appropriate specification for FCAW filler materials that matches the mechanical properties and composition of ASTM A516 Gr.55 is AWS A5.20. This specification is specifically designed for solid and flux cored rods and wires for gas shielded arc welding of carbon and low-alloy steels. Filler materials categorized under AWS A5.20 typically offer good strength and toughness, which are necessary for maintaining the integrity of welded joints in the specified applications.

By using a filler material from AWS A5.20, one ensures compatibility with the chemical and mechanical requirements set forth in ASTM A516, thereby achieving a reliable and durable weld that will perform well under the service conditions for which A516 Gr.55 is intended.