FOCUS POSITION SETTING:
This’s one of the key parameters in laser cutting and directly affects the laser
being able to cut through with good quality or not
As you can see here, the
more offset it’s from the
focus position, the wider
the cutting gap and
reduced cutting power.
POSITIVE FOCUS POSITION:
- Used for cutting carbon
steel with oxygen.
- Here the focus position is set
on top of the material so that the
heat can work hand in hand with
oxidation to cut through the
material.
NEGATIVE FOCUS POSITION:
- Used for cutting stainless
steel, brass, aluminium… with
compressed air or nitrogen as
auxiliary gas.
- The focus position is set
inside the material.
- Normally all the Pierce
values for focus position on any
material should be negative so that
the pierced hole can be as small as
possible.
BY NGONI CHIBVONGODZE
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