Alstom Technology Limited

Edward Obbard

Matthias Hoebel

Alexander Schnell

Matthias Höbel

Walter Brehm

It is disclosed a method of applying a coating () with a controlled laser metal forming process. A light source with a specific power and a signal capturing apparatus is moved over an article () to form locally a melt pool () on the surface () of the article () to which a coating powder () is injected. An optical signal () is captured from the melt pool (), and the monitored optical signal () is used for the determination of the temperature and temperature fluctuations of the melt pool (). Furthermore, a control system () is used to adjust at least one process parameter such as the power of the light source to obtain desired melt pool properties. Subsequently the melt pool () solidifies. The high degree of control over the microstructure provides an efficient tool for generating laser metal formed hard coatings () with optimised wear properties.

Method for controlling the microstructure of a laser metal formed hard layer

It is disclosed a method for fabricating, modifying or repairing of single crystal or directionally solidified articles. Two single crystal or directionally solidified prefabricated parts are joint by isothermally brazing using a brazing material. After that an epitaxial or non-epitaxial layer on the surface of the created article and of the braze joint is applied using a laser metal forming process.

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Jersey, United Kingdom

Edward Obbard