This video shows why Excalibar is the best 7018 to use. You get much better penetration. The 7018 AC has low penetration and porosity at the start thanks to the fillers. The flux of the 7018 AC is made so it CAN run on AC, all rods run on DC. ESAB zealots and people with AC buzzboxes keep voting this video dow, but you know it's true. LOL.