In welding, what does 'ER70S' classify in the AWS specification?

'ER70S' classifies the electrode type in the AWS specification. In the designation 'ER70S,' the 'E' stands for 'electrode,' which indicates that this material is meant to be used in welding processes involving filler materials. The 'R' indicates that it is a rod that can be used for various welding processes, including MIG welding.

The number '70' signifies the minimum tensile strength of the weld metal in thousands of psi, which highlights that it is capable of withstanding significant stress. The letter 'S' denotes that the filler metal is suitable for use in all-position welding. Therefore, the classification provides essential information about the electrode's properties and intended applications in welding, making it crucial for welders to select the appropriate filler material for their projects. Understanding this classification is vital for achieving sound welds with the desired mechanical properties.