LOKERMANN GRAND CUT 40 PFC MV, Руководство пользователя, Страница: 11 / 18

3.3.2
Operating
Techniques
1. Piercing - Materials (up to 3.2mm/1/8in. thick) work. When piercing thicker materials (up to4.8mm
stainless or carbon steel) at an angle, position the torch 0.5mm (.02”) above the work piece.
It is advisable when piercing thicker materials to drill a small pilot/starting hole in the work piece
which makes it a lot easier and gives increased tip life. Start the cutting arc, then immediately raise
the torch to 1.6mm (1/16”) stand-off and move the torch along the cut path. This will reduce the
chance of spatter from entering the torch and prevent the possibility of welding the tip to the plate.
The torch should be angled at about 30° when starting to pierce, and then straightened after
accomplishing the pierce.
2. Grate Cutting - For rapid restarts, such as grate or heavy mesh cutting, do not release the torch
switch. This avoids the 2 second pref-ow portion of the cutting cycle.
3. Edge Starting – For edge starts, hold the torch perpendicular to the work piece with the front of
the tip near (not touching) the edge of the work piece at the point where the cut is to start. When
starting at the edge of the plate, do not pause at the edge and force the arc to ‘reach’ for the
edge of the metal.
Note: The speeds given here are typical for best quality cuts. Your actual speeds may vary depending
on material composition, surface condition, operator technique, etc. If cutting speed is too fast, you
may lose the cut. With slower speeds excessive dross may accumulate. If speed is too slow, the arc may
extinguish. Air cutting typically produces a rough face on stainless steel and aluminium.
Establish the Cutting Arc as Quickly as Possible.
4. Drag Cutting - Position torch tip slightly above work piece, press torch switch and lower torch tip
forward work piece until contact is made and cutting arc is established. After cutting arc is established,
move the torch in the desired direction keeping the torch tip slightly angled, maintaining contact with
the work piece. Avoid moving too fast as would be indicated by sparks radiating from the topside of the
work piece. Move the torch just fast enough to maintain sparks concentration at the underside of the
work piece and making sure the material is completely cut through before moving on.
Adjust drag speed as desired/ required.