Tips for Setting Parameters of Laser Marking Machines for Use with Surgical Stainless Steel

Medical-grade stainless steel requires very precise laser parameters, from the basic settings of power and frequency to the fine details of nitrogen protection. Each step directly affects the quality of the marking on the medical device.Only by adjusting the focus to accommodate different material thicknesses, paying attention to the impact of temperature and humidity on the marking effect, and combining reasonable scan speeds and fill parameters, can one guarantee the functionality of medical instruments while achieving a clear, durable mark.

Why does stainless steel used in medical instruments require special markings?

The accuracy required of markings on medical equipment is much greater than that required for ordinary industrial products. If the parameters of the laser marking machine in our hands are not properly adjusted, the marks may come out blurred, or even destroy the corrosion-resistant surface of the instrument.This is especially the case with surgical tools, which come into direct contact with the human body. If the laser marking is not uniform, it may be a breeding ground for bacteria.

The three core parameters.

Power and frequency are in tune.

For 316L stainless steel, it's recommended to start with 30 watts and a frequency of around 20 kHz.If you encounter a tray that is especially reflective, you can raise the power to 35W, but don't go over 40W, or you'll get burnt edges.

Finding the right balance between speed and density.

At 0.8 meters / second, the scanning speed is matched to a 0.06 mm pitch, which guarantees a clear image without excessive heat.You have to make small adjustments for different brands of machine, for example, with Trumpf machines you can increase the density of the filler by 5 %.

The correct way to open an oxygen tank.

Don't underestimate the nitrogen. Under the protection of 99.95 % pure nitrogen, the extent of oxidation can be reduced by more than 70 %.The air pressure should be kept between 0.3 and 0.5 MPa. If the needle on the pressure gauge is shaking violently, check the air line.

A practical guide to avoiding pitfalls.

The domino effect of material thickness.

Have you ever had a 1.2 mm-thick medical instrument marked with yellow? Try adjusting the focal length to + 0.5 mm. This trick can prevent deformation of thin-walled objects.If the depth of the mark exceeds 0.03 mm, remember to do a second passivation treatment.

The invisible influence of temperature and humidity.

During the rainy season, when the relative humidity exceeds 60 %, it is recommended that the machine be turned on half an hour in advance to warm up.There's a little trick: put a glass of warm water next to the equipment. When the glass no longer fogs up, it's time to get to work. This is more direct than checking a humidity meter.