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Issue 051 - Summer 2008

Micro-cladding with a fibre laser

Author: Torsten Jambor and Konrad Wissenbach

The current state of the art in commercially available systems for micro- laser-cladding use pulsed Nd:YAG lasers and deliver  additive material in wire form. Typical laser spot diameters exceed 100 μm [1]. The additive material is fed manually, so the quality and the reproducibility of the cladding process are strongly influenced by the personal skills of the person undertaking the task. Alternatively, a two stage process can be used. In the first step the additive material is deposited/printed on the substrate with a binder and in the second step melted by laser radiation [2].

Some investigations have been made to develop the single step laser cladding process [3], but a systematic investigations to realize structure sizes smaller than 100 μm with iron, cobalt and nickel alloys are still to be reported.

Approach
The investigations at the Fraunhofer ILT aim at a structure size (width) between 20 and 100 μm by laser cladding with powder injection. Figure 1 illustrates the process scheme.

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