In the wire designation ER70S-6, what does the number 70 signify?

In the wire designation ER70S-6, what does the number 70 signify?

• A. The wire size code
• B. The gas type used
• C. The tensile strength expressed in psi (70 represents 70,000 psi)
• D. The current setting

Answer: (C)

The number shown is the weld metal’s strength rating. In ER70S-6, 70 means the wire is rated for a minimum tensile strength of 70 ksi, which is 70,000 psi. This tells you how strong the deposited weld will be. It isn’t about wire diameter, shielding gas, or the welding current setting. The rest of the designation—ER for electrode wire, S for solid wire, and the -6 for the deoxidizer/alloying level—gives other characteristics, but the 70 specifically communicates the strength requirement.

The number shown is the weld metal’s strength rating. In ER70S-6, 70 means the wire is rated for a minimum tensile strength of 70 ksi, which is 70,000 psi. This tells you how strong the deposited weld will be. It isn’t about wire diameter, shielding gas, or the welding current setting. The rest of the designation—ER for electrode wire, S for solid wire, and the -6 for the deoxidizer/alloying level—gives other characteristics, but the 70 specifically communicates the strength requirement.