ALOtec Dresden GmbH

Ihr Technologiepartner für die Lasermaterialbearbeitung

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Home Technology Laser Hardening

Technology - Laser Hardening

The surface hardening with high power diode laser (short laser hardening and laser-beam hardening) is increasingly used in industrial manufacturing and toolmaking.

The laser hardening is a process in which the energy input takes place by means of radiation directly to the component surface. The laser beam heats short term and localized the top portion of the workpiece up to the austenitizing temperature of the material used. This leads to a homogenization of the carbon distribution and thus to a spread of a front of austenitization in the material.

Depending on the material used, the austenitizing temperature is about 900 ° C to 1400 ° C and time to temperature at about 3 s to 10 s.

Laserstrahlhärten einer Kurvenbahn aus GGG60
  Example laser hardening of a curved track of cast iron GGG60

Due to the small amount of heat input and rapid heat dissipation over the component a self-quenching is achieved, which causes a "freezing" of the hardness structure. The use of additional media for quenching, such as water, oil or compressed air is not required.

The laser hardening is suitable for all hardenable materials, which can be harded by flame hardening and induction hardening.

Please request our free CD including further information and process videos.

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Service:

As a contract manufacturer we offer you laser hardening on our own hardening systems. We are glad to assist you in use of this technology and submit you a custom quote.

For your sample parts you will receive a detailed report containing the following:
  • achieved hardness
  • achieved hardening track width
On request we prepare cross sections of these parts, determine the case depth and create micrographs.

Advantages of Laser Hardening

  • suitable for all hardenable steels with sufficient carbon
  • hardening track width 1-50 mm in dependence of optics and maximum laser output power
  • Case depth up to 1.5 mm, depending on material
  • low distortion through selective, high energy input at extremely short residence time, results in a reduction of rework
  • hardening temperature on the workpiece surface is adjustable to + / - 10 ° K
  • stress-related selective hardening of single workpiece surfaces. The result is a hard surface with tough core and unaffected areas in the immediate vicinity
  • additional media for quenching as water or gas are not required

technical limitations

  • no overlapping tracks possible, the overlapping subsequent  hardening track causes a tempering of the previous hardening track, minimal required distance of hardening zones is about 1.0 - 1.5 mm
  • larger areas are covered by parallel and or meander tracks
  • Working distance laser head - workpiece surface is about 100-350 mm, depending on optics
  • a clear working space for laser head and beam caustic for direct radiation on the to be hardened component surface must be taken into account
  • necessary protection device due to laser radiation scattering
   
 Video and Simulation with Explanation Report (German)
 icon Video und Simulation einer Härterei (113.63 MB)
Laser Hardening of a Mould
icon Video Laserhärten im Formenbau (11.57 MB)
Article about Laser Hardening icon Laser Hardening of Tools and Machine Components (127.96 kB)

 
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laserhardening - tool making

laserhardening - mold making

laserhardening - machine buildiung