| Laser Marking: Changing Metal Without Weakening |
Laser marking creates contrasting patterns on metal objects, making them permanent but without affecting the integrity or shape of the metal. Laser marking generally creates a mark by removing the carbon or oxides and is often used on tools, medical instruments, and bearings. Laser marking is often used to imprint specific safety, regulation, and brand information on metal parts. For example, different widths of scalpel can be marked directly on the scalpel with laser marking, creating safer surgery. Laser marking can also be used to embed sizes on bolts so that contractors use the correct type of bolt for safety.
There are actually several methods of laser marking. One of the most used methods is called surface etching. This type of laser marking works by changing the surface finish of a metal at a depth of 0.0001 of an inch. Ablating is another form of laser marking. This form of marking works well with painted steel and with aluminum. It works by removing part of the coating or paint from a metal to mark the metal with no loss of integrity. Thermal laser marking subjects metals to pulses of laser which have been set to a specific speed, pulse, and power in order to create different colors. It is often used with alloys and creates color variations on metals.
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