Originally Posted by
bytor
As for the bevel angle, first blush is the Arc Voltage it too low, but I have a few questions.What is the direction of the torch when cutting - clockwise or counterclockwise? Scrap is always to the left of the direction of travel.
Is the plate level and square with respect to the torch? Was this cut performed with brand new fresh consumables? If not, what is the condition of the nozzle? Perfectly round?
As for the dross/slag at the bottom of the part, does it chip off easily or is it a grinder only removal?
Rule of thumb is 10 amps per mm of cut thickness. Try 100 or 120 amps for cutting this and mind your feed rate.
The lag lines in the beveled part seem very pronounced. These are usually motion related and may be inherent to the design of the table (Motors, rails, controller) or may be an indication that you need to perform maintenance to the motion systems (pinions, rack, bearings).
Coming back to the bevel and direction of travel, Outer dimensions are cut clockwise, inner dimensions are cut counter-clockwise
Edited for clarity