Use in all positions on low, medium and high-carbon steels. 70,000 PSI tensile strength. Runs on AC or DCEP (reverse) polarity. Not recommended for low-voltage AC welders.
At least for me 7018 sticks need pure steel and a lot more juice to get started, they offer a nicer weld surface than 6013 probably, better for machine repairs.
Length varies up to about 3 inches They're only good if you want the sticks to stick to the material with each pass , or if you want to make welds that contain only slag.
These sticks have been advertised and labeled as suitable for use with AC or DC welders. However, the bars were NOT marked 7018AC. They will not work with an AC welder. My friend tried them on his DC welder and they worked well. Don't buy them expecting they will work with an AC welder. Make sure you only buy this type of rod if the rod number specifically includes "7018AC".