Which electrode can be used for both DC and AC applications?

The electrode identified for use in both DC and AC applications is characterized by its versatility in welding processes. Specifically, ER70S-6 is a solid wire electrode commonly used in gas metal arc welding (GMAW) and is classified as a general-purpose welding wire for a variety of applications, including carbon steel welding.

This electrode's design allows it to perform effectively with both direct current (DC) and alternating current (AC) welding machines. The ability to work well with AC makes it particularly valuable when welding thin materials or in conditions where the power supply may fluctuate, allowing for good arc stability and a smoother finish.

The other electrodes mentioned have specific properties or compositions that lend them to particular uses. For example, E70C-8 is predominantly used in flux-cored arc welding and may have restrictions with AC. E100T-1 is meant for specific applications that primarily favor DC. E7018 is a low-hydrogen electrode which is normally used with DC, thus limiting its application when AC is required. The functionality of ER70S-6 in both current types is what makes it a versatile choice for welders across various projects.