This thesis presents an investigation into the laser cladding process using CO2 and Nd:YAG lasers. The work is divided into four papers: Paper one is a literature review of the subject of laser cladding. This presents a general overview of the subject from a practical and theoretical point of view. Paper two is an investigation about the energy redistribution during CO2- laser cladding. Experimental absorption measurements by calorimetry were carried out to separate and analyse how much of the energy is lost by reflection etc. It was found that approximately 60% of the original laser power is lost by reflection. Paper three extends the work of paper two and compares the process efficiency of Nd:YAG and CO2 laser cladding. The energy redistribution during cladding has been analysed for both processes. The Nd:YAG laser cladding process was found to be considerably more energy efficient than CO2- laser cladding process. Paper four presents preliminary experimental results from two new processes; Laser casting and Laser clad-casting. Laser casting is a process similar to blown powder laser cladding but without the final product joined to the substrate. The substrate acts as a mould and the casting retains topological features of the substrate. Laser clad-casting involves the production of a clad layer between machined copper blocks. Clad tracks can therefore be achieved with large depth to width ratios and pre determined cross sections. / Godkänd; 2002; 20070222 (ysko)
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:ltu-17388 |
| Date | January 2002 |
| Creators | Gedda, Hans |
| Publisher | Luleå tekniska universitet, Luleå |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Licentiate thesis, comprehensive summary, info:eu-repo/semantics/masterThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | Licentiate thesis / Luleå University of Technology, 1402-1757 ; 2002:13 |
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