Laser technology

Laser hardening and cladding processes at TechnicGroup are carried out in a fully automated manner, using industrial robots. High process parameters repeatability and their control at every stage guarantee top-level quality of the processed surfaces. The mentioned technologies can be used not only for regeneration of worn out or damaged parts of machines and devices, but also for improving the functional properties and extending the working time of new components.

Hartowanie laserowe

Laser hardening

Laser hardening is a process used for machine and device parts surface refining. Its goal is to increase the hardness of the processed surface and, thus, obtain higher abrasion resistance. Carrying out this process on critical components exposed to accelerated wear contributes measurably to significant extension of their working time, which in turn leads to operating costs reduction. 

Contrary to conventional hardening methods (induction or furnace), the working beam in laser hardening process is focused only on the surface of the area undergoing refinement, which means that the entire element is not subject to overheating. This technology significantly lowers the risk of post-treatment change in the geometry of the component, which could occur as a result of introducing a large amount of heat into the entire element. At the same time, it allows for obtaining the desired structure of the surface.

 

Moreover, in comparison to other hardening methods, laser hardening makes it possible to precisely select the surface fragments to be hardened. One of the advantages of this technology is the fact that it does not require post-treatment tempering and usage of cooling media, which practically means that the processed element can be delivered to the customer immediately after hardening.

Laser hardening is a fully robotic process, which ensures accurate mapping of the planned hardening path, as well as its repeatability for larger batches of elements. The temperature of the element during the process is monitored on an ongoing basis using a pyrometer / thermal imaging camera, which ensures repeatability of the process parameters, and thus maintaining fixed hardening conditions. This is especially important in terms of maintaining high-quality of the processed surfaces for large-scale orders and geometrically complex elements.

Process:

As a result of emitting a concentrated high-power laser beam, austenite transformation occurs in the area of the treated surface of the base material. Once the laser beam is no longer focused on the surface, the surface cools down immediately, which results in the formation of a hard, fine-grained martensitic structure. Depending on the processed material, the depth of the hardened layer may reach up to 2.5 mm. The obtained hardness value depends on the processed material and corresponds to the upper limit of the martensitic transformation.

The following materials can be laser-hardened:

  • — steels for thermal improvement (25HM/25CrMo4, 35HM/34CrMo4, 40H/41Cr4, 40HM/42CrMo4, 34HNM/34CrNiMo6, 36HNM/36CrNiMo4, 38HNM/39NiCrMo4, 30HGSA, 30HGS, 30H2N2M/30CrNiMo8);
  • — carbon steels (C15E, C22E, C35E, C45E, C50E, C55E, C60E);
  • — steels for carburizing (15H/17Cr3, 20H/20Cr3,16HG/16MnCr5, 20HG/20MnCr5, 17HNM/17CrNiMo6-4, 20HNM/22NiCrMo2-2);
  • — cold and hot work tool steels (NC6, NC7VL, NC10, NC11, NCLV, NC11LV, WCL, WCLV, WNLV, WLV);
  • — martensitic stainless steels (1H13/X10Cr13, 2H13/X20Cr13, 3H13X30Cr13, 4H13/X40Cr13);

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