Final answer:
The electrode E-6011 is known as a fast freeze, deep penetrating, all purpose electrode, suitable for welding dirty or rusty materials and usable with AC and DC currents.
Step-by-step explanation:
The electrode referred to as a fast freeze, deep penetrating, all purpose electrode is E-6011. This electrode is known for its ability to penetrate deeply and is often used for welding on materials that are not perfectly clean, as it can handle a certain amount of dirt or rust. The fast freeze characteristic refers to its quick solidification which helps prevent weld defects in vertical or overhead welding positions. It has a very forceful arc and can be used with both AC and DC currents.