By 803056
Date 11-01-2018 19:45
Edited 11-01-2018 19:51
Top left, slope maybe? It appears to be voltage versus time.
The wire feed speed appears to be the lower left toggle with the knob adjusting the WFS up or down. The same toggle appears to control shielding gas preflow perhaps.
The top right appears to be arc voltage. Decreased voltage, shorter arc length, longer electrode extension. Higher voltage, longer arc length and shorter electrode extension.
Just a SWAG.
Al