According to AWS specifications, what is the designation for low carbon steel GMAW electrodes?

The designation for low carbon steel GMAW (Gas Metal Arc Welding) electrodes according to AWS specifications is 5.18. This designation is derived from AWS A5.18, which specifically covers the classification of wires and rods for GMAW of low carbon and low alloy steels.

The "5" in the designation indicates that it is a filler metal classification for welding, while ".18" is a specific subset for gases and low carbon steel. This classification system helps welders and engineers to select the appropriate filler metal for their welding projects based on material compatibility and performance characteristics. Understanding these designations is crucial for ensuring the quality and integrity of welds in structural applications.