What number is used by both AWS and CSA to identify all position wire for FCAW?

The number that identifies all position wire for Flux Cored Arc Welding (FCAW) is indeed one. This designation is critical because it provides a standardized way for welders and industry professionals to identify the usability of specific filler materials across various welding positions—such as flat, horizontal, vertical, and overhead.

In welding, understanding the position capability of a wire is essential for achieving quality welds in different orientations. The designation of one signifies that the wire is versatile enough to perform well regardless of the welding position, making it a suitable choice for a wide array of applications.

This classification is part of a broader system used by organizations like the American Welding Society (AWS) and the Canadian Standards Association (CSA), ensuring consistency and clarity across the industry. Consequently, the number one is recognized universally within these organizations as denoting a wire that is capable in all positions, which is why it is the correct answer.