In electrode classifications, what does the E7018 designation indicate?

• A. E indicates electrode, 70 = minimum tensile strength of 70 ksi, 18 = low-hydrogen, cellulose-arc type.
• B. It is a brand name for a welding machine.
• C. It indicates the welding process.
• D. It refers to the welding groove type.

Answer: (A)

In electrode classifications, the designation encodes three things: that this is an electrode, its strength, and the coating/hydrogen characteristics. The E tells you it’s an electrode. The 70 in the middle means the weld metal must have a minimum tensile strength of 70 ksi. The final digits, 18, specify the coating type and hydrogen content that produce a low-hydrogen weld, typically described as a low-hydrogen, flux-based (cellulose-arc style) electrode. So E7018 represents an electrode with at least 70 ksi strength and a low-hydrogen flux coating suitable for strong, crack-resistant welds. It’s not a brand, not a welding process, and not a groove type—the designation conveys material and coating properties, not machine brand or joint geometry.