This plate is placed on a 45 degree to simulate that 4-5 o'clock area of a 5G pipe where things start to sag. Its not true overhead and not vertical either. But is a great practice plate leading to pipe
Overhead welding with a 7018 can be done at the same amperage used for flat or horizontal, or close to it. Set the machine hot enough so that it won't stick when you hold a tight arc, and then... hold a tight arc.