Laser Cladding By Powder Injection

Optimization of the processing conditions article pdf available in journal de physique iv proceedings 01 c7 december 1991 with 65 reads.

Laser cladding by powder injection.

The capability to mix two or more types of powders and to control the feed rate of each powder flow makes laser cladding a flexible process for. In the proposed method the interaction between powder and melt pool. Laser cladding has the potential for very high deposition rates with dilution as low as 1 2. Many of the process parameters must be manually set such as laser power laser focal point substrate velocity powder injection rate etc and thus require the attention of a specialized technician to ensure proper results.

Using coaxial powder injection in combination with a lateral feed wire system improvements to the laser cladding process have been made. A two dimensional 2 d finite element model is presented for laser cladding by powder injection. Laser cladding by a powder injection technique has been widely used in industrial applications such as rapid manufacturing parts repair surface coating and innovative alloy development. In this article a mathematical model is developed to simulate the coaxial laser cladding process with powder injection which includes laser substrate laser.

In this process a laser beam melts powder particles and a thin layer of the substrate to create a bulk layer on the substrate. Filler material can be added via powder injection or hot wire offering a wide range of off the shelf and custom solutions. It takes into account the melting of the powder in the liquid pool and the liquid gas free surface shape and position which must conform to the thermal field in order to obtain a self consistent. To obtain a high quality resulting part a deep understanding of the underlying mechanisms is required.

Laser cladding by a powder injection technique has been widely used in industrial applications such as rapid manufacturing parts repair surface coating and innovative alloy development 2 14 18. Laser cladding is a fully automated additive process that uses a high power laser to create a weld pool. When the sole mechanism of the feed system was coaxial powder injection the deposition ranged from 27 for an 1100 kw laser to 33 for a 1500 kw laser. The proposed model can predict clad geometry as a function of time and process parameters including beam velocity laser power powder jet geometry laser pulse shaping and material properties.

The model simulates the quasi steady temperature field for the longitudinal section of a clad track. Laser cladding by powder injection. A great deal of research is now being concentrated on developing automatic laser cladding machines.