What does the "70" stand for in ER70S-3?

What does the "70" stand for in ER70S-3?

• A. Tensile strength
• B. Carbon content
• C. Weld position
• D. Heat input

Answer: (A)

In ER70S-3, the number you see is the minimum tensile strength of the weld metal, expressed in ksi. Tensile strength is how much stress the welded joint can withstand when pulled before it breaks. So 70 ksi means the weld metal is designed to reach at least about 70,000 pounds per square inch of tensile strength (roughly 480 MPa). The other parts of the designation describe other properties of the wire, such as its form and intended welding conditions, but the 70 specifically denotes the strength. It isn’t about carbon content, heat input, or weld position.

In ER70S-3, the number you see is the minimum tensile strength of the weld metal, expressed in ksi. Tensile strength is how much stress the welded joint can withstand when pulled before it breaks. So 70 ksi means the weld metal is designed to reach at least about 70,000 pounds per square inch of tensile strength (roughly 480 MPa). The other parts of the designation describe other properties of the wire, such as its form and intended welding conditions, but the 70 specifically denotes the strength. It isn’t about carbon content, heat input, or weld position.