LASER WELDING
LASER HARDENING SYSTEMS
I
nitially providing a ‘Total Laser Maintenance’ service, TLM Laser now offers a complete range of laser
products from some of the leading globally renowned names in laser technology. The company prides itself on being a ‘solutions’ provider with long term experience and cutting edge expertise. Here, the company’s experts focus on laser hardening. In laser heat treating, energy is
transmitted to the materials' surface in order to heat it in a closely controlled way to between 900°C and 1,300 °C to create a hardened layer by metallurgical transformation. The laser is used as a heat source, and rapidly raises the surface temperature of a small part of the material. Heat sinking of the surrounding volumetric mass provides rapid self- quenching, thus producing a hardened
transformation layer. Therefore, no oil or water is required for quenching. This makes laser hardening cleaner and
more readily mobilised than traditional heat treatments. Any ferrous metal (steel or cast iron) that would normally be hardened by more traditional methods like flame or induction hardening, can be hardened with a laser. The process of laser hardening is more versatile than flame hardening or induction hardening. It provides reliable, repeatable,
non-contact and energy-efficient heat in a minimal amount of time. For hardening, the laser beam provides the necessary control and accuracy to focus the heat to a specific area of the part. The laser is suitable for integration within already existing manufacturing equipment and production lines. Apart from the traditional hardening
36 / WELDING WORLD MAGAZINE - ISSUE 05 - SEPTEMBER 2024
process, laser hardening offers a range of applications for tasks that could not be solved hitherto, such as components with special forms and special functional surfaces. This includes selective hardening of single workpiece surfaces. Here a selective hard surface arises with a tough centre and uninfluenced areas in the surrounding material: Hardening tracks at cutting edges, guide tracks, grooves and free mould surfaces with continuous crossing geometry: Good hardenability of surfaces which are difficult to reach such as craned grooves, flutes and interior surfaces. Dot hardening at naps and in blind holes, as well as hardenability of thin, warp-prone parts by a selective, quick heat input at extremely short and well- timed intervals can also be achieved.
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