Which electrode designation is generally used for general purpose applications?

The designation ER70S-6 is commonly used for general-purpose applications in welding due to its excellent mechanical properties and versatility. This electrode type is known for its high levels of deoxidizers, which allow it to perform well in various welding positions and on surfaces with light rust or mill scale. The "S" indicates that it is a solid wire, which is suitable for a wide range of materials, particularly carbon and low-alloy steels.

Additionally, ER70S-6 is favored because it provides good impact properties, making it a reliable choice for structures that may be subjected to dynamic loads. It also has the ability to produce welds that meet the requirements of numerous specification codes, thus enhancing its applicability across different industries.

The other electrode designations also serve specific purposes, but ER70S-6 stands out for its balance of usability and performance in a broad spectrum of applications, which is why it is often associated with general-purpose welding tasks.