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Glossary of laser cutting terms - H
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Hard Limit
A hard limit is a stop on the machine that prevents the machine
from moving further in a given direction. Typically these
are used to prevent the machine from moving beyond its physical
limits. See Soft
Limit.
Heat Affected Zone
(HAZ)
During laser cutting of steels a huge amount of energy is
conducted into the work piece resulting in changes in the
material properties and the microstructure of the steel. This
activity results in a narrow zone exactly adjacent to the
laser cut that experiences changes in material properties.
Typically, the changes occur either as grain refinement, or
as precipitation of carbides (which are harmful for corrosion
resistance properties of steel) and other impurities such
as sulfides and phosphides. The entire region which differs
from the base material in properties can be defined as the
heat affected zone or HAZ.
Heat influenced zone
See Heat Affected Zone.
Helium-Neon (He-Ne) Laser
A laser that produces a visible (red; 632.8 nanometers) beam
of light and in which the active medium is a mixture of helium
and neon. He-Ne lasers are often used for alignment of laser
optics and as an aid for set-up and alignment of workpiece
and fixturing plus recording, printing, and measuring.
Hold Tolerance
Term used to describe the variation of a laser cut +/- to
a predetermined target, usually measured in thousandths of
an inch.
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A spot on the machine that is defined either in software
or hardware as a reference point.
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