Anneal Marking

Anneal marks are created on stainless steel by heating the work piece with a laser beam to form an oxide at the surface, which creates a colour change to the surface of the work piece. Generally, the colour of the mark is black, but other colours including red, green and yellow can be achieved depending on the temperature the material is subjected to.

In the anneal marking process the material surface is not melted so no material is removed and the mark is achieved through the solid state growth of an oxidised layer.

The challenge is to produce a permanent mark which can be easily read. Our G4 70W HS-H fibre laser was tested on stainless steel and is able to achieve a high quality, dark mark which can be read from most viewing angles with a process time of 11 seconds to produce 26 characters, 10mm in height.

The HS-H type laser is mainly used for applications which require fast processing of large areas. This is because the higher M² value of the HS-H type laser produces a broader energy distribution and therefore does not have a hot-spot like most single mode lasers.

This type of mark can be made on some other types of steels and cast iron but the result is very dependent on the grade.

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Application Parameters

Type G4 70W HS-H
Power Demand 70W
M2 2.5-3.5
Beam Ø >7mm
Scanner/Lens 15mm/254mm FL
Energy WF1 86kHz @ 80mm/s

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