Selective laser material processing

The requirement:

Cleaning or de-coating and changes of materials.

The objective:

Prepare and configure surfaces for ongoing treatments and processing.

The advantages:

  • Individual configurability of the lasers due to specific requirements in surface treatment
  • Removal of wafer-thin layers Surface changings like roughening / structuring
  • Low operating costs
  • High environmental compatibility, no auxiliaries; consistent product quality of your products

Basically we distinguish between two kinds of treatments

Treatment of metallic material

Treatment of composite material

Structuring or material removal on metals

Depending on the application, the character of a surface has to be different. In many cases it only has to be cleaned or de-coated. Sometimes oxide layers have to be removed, surfaces have to be roughened or structured, sometimes even smoothed. In each of these cases, the SLCR laser treatment can be used efficiently. Hereby we use the interaction of the laser with the material to be treated in different ways, to

  • selectively remove thin surface layers, e.g. oxides or corrosions
  • roughen surfaces
  • smooth surfaces

Removal of corrosion or oxide layers:

With a controlled appliance of laser radiation with high pulse levels, corrosions (rust) or oxide layers can be removed. The laser beam enters little micrometres into the structure and blasts off the upper layers of the material. With the appliance of several pulses, the surface can be freed of oxides or other disturbances in the material.

Roughening and structuring

The surface roughening is mostly used for bonding or painting preparations. Even here, the surface is changed to achieve a defined roughness of metals, typically up to 20µm Ra.
In other fields, functional surfaces will be roughened to create defined characteristics for ongoing utilisations.

Removal of composite material

LMP – Laser Material Processing:

Background:

There is an increasing use of composites in aviation industry. Already in production, but especially during maintenance and repair works on the plane, this use creates big challenges.

Based on years of experience in the treatment of composite materials with laser, SLCR has developed, especially for the repair of CFRP and GFRP materials, a new process for the selective removal of composite structures.

Process description:

Through a controlled application of laser radiation, the matrix of the material can be removed selectively, without damaging the underlying fibres. Exposed and overlaying fibres can be deleted in a controlled way. Thus, a selective removal in depth (µm) as well as laminary can be controlled exactly. Thereby, the required concave deepening (mounting) is generated. It is either created as a cascaded mounting in a defined relation or as a continuous mounting.

Due to the selective and controlled laser treatment, the mounting of the component does not cause any loss of strength at all in the remaining structure. The SLCR-process is quick, clean, automated and cost-saving!

Preparation of a repair by gentle removal of material, layer by layer, without damaging the remaining structure

Referring to quality and safety, this SLCR-process clearly demonstrates the advantages of an automated laser treatment of composite materials in comparison to manual processes.

The following pictures show a laser repair preparation compared to a manual sanded repair preparation: