Laser Annealing / Heat Marks
What is Annealing?
Annealing, also known as heat marking, is a thermo-chemical reaction that occurs when a laser beam applies a low amount of heat to the surface of a part. The heat causes an oxidation process that alters the color of the material, resulting in a visible and permanent mark. However, there is no depth in the mark as annealing does not displace any material.
Most heat marks on metal will result in a dark or black mark, which is why this process is also referred to as black annealing or dark marking. Other colors are possible though, depending on the composition of the metal being marked.
This process of heat marking can color the surface of various metals, including steel, titanium, and stainless steel. In fact, this process is best performed on stainless steel due to oxygen and oxidation due to the chemical reaction causing the heat mark.
WHAT TYPES OF MATERIAL CAN BE ANNEALED?
Metals that contain carbon can be annealed. Typically, the best heat marks are produced on titanium, steel, stainless steel, iron, and carbide.
WHAT TYPE OF LASER SOURCES ARE USED FOR ANNEALING?
Fiber and YVO4 CO2 laser sources can provide excellent heat marks. The material composition of the part you are marking will determine which laser source is best for your application.
WHAT INDUSTRIES OR APPLICATION USE THE ANNEALING PROCESS?
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At GT SCHMIDT, we design, build, and implement marking solutions that help manufacturers leave a lasting mark on their products, their companies, and their industries.Learn More About Us