In electrode coding, what does the digits '70' typically represent?

• A. It indicates the welding current type
• B. It indicates the base metal thickness
• C. It indicates the minimum tensile strength of 70 ksi
• D. It indicates the electrode diameter

Answer: (C)

Digits in electrode coding indicate the minimum tensile strength of the deposited weld metal, expressed in ksi. The 70 in codes like E7018 means the weld metal should have at least 70 ksi of tensile strength. This guides you to select an electrode that will meet the strength requirements of the joint. It isn’t about welding current type, base metal thickness, or electrode diameter—the other parts of the code describe those aspects, while the 70 specifically targets the weld metal’s strength.