What does the "15" in the welding electrode "E7015" typically indicate?

The "15" in the welding electrode designation "E7015" specifically indicates the minimum tensile strength of the weld metal produced by the electrode, measured in thousands of pounds per square inch (ksi). In this case, the "70" signifies that the electrode can produce welds with a minimum tensile strength of 70 ksi. The "15" indicates that the electrode is suitable for welding in positions other than flat and horizontal, specifically for use in all positions, excluding overhead.

Understanding the designation system for welding electrodes is critical for selecting the right electrode for the job. The first part of the designation, "E," denotes that it is an electrode. The following digits represent the minimum tensile strength, while the last digit usually indicates the welding positions and certain other characteristics of the electrode, such as its coating type.

Thus, knowing that "E7015" represents an electrode with a minimum tensile strength of 70 ksi and its position suitability aids welders in making informed decisions about which electrode to use in various welding applications.