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Metal Casting Technologies : March 2011
METAL Casting Technologies March 2011 37 ELEMENTAL ANALYSIS Innovation with Integrity www.bruker.com Optical Emission Spectrometers CS/ONH-Analyzers Handheld XRF Analyzers Solutions for Metal Analysis Out of One Hand: Asean Countries MSITECH (ASIA PACIFIC) PTE LTD Phone: +65 65096938 Email: info @msitech.net Australia Bruker Biosciences Pty Ltd Phone: +61 394747000 Email: firstname.lastname@example.org India (OES & Handheld) Sohm Hi-Tech Sytems (I) Pvt Ltd Phone : +91 2232914749 Email: email@example.com India (CS/ONH-Analyzers) Technosys Phone: +91 8022126402 Email: firstname.lastname@example.org cold rolled ESR plate. The coefficients of thermal expansions (CTEs) of rolled aluminium were measured using a dilatometer. The linear thermal expansion tests were performed over the temperature range of 300C to 3000C. Scanning Electron Micrograph images were taken for the tensile fractured samples. Results and discussions The ingots were examined visually for surface finish. Figure 2 shows the aluminium ingot prepared by ESR process using arcing method. It can be seen that the surface is totally non uniform and rough. The process has failed as the slag didn't melt at all. There was no refining action. Unmelted slag can be seen on the ingot and there is absence of metallic shiny aluminium colour. Figure 3 shows the ingot using liquid start method. The surface is far better than the earlier ingot. There is absence of shrinkage pipe at the top. The surface is bit irregular and is due to the varying power for Figure 3. An ingot using liquid start method