smeltparel
English translation: melt bead
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| 10:30 Oct 22, 2015 |
| Dutch to English translations [PRO] Tech/Engineering - Engineering (general) / fire investigation | |||||||
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|  Selected response from: Michael Beijer United Kingdom Local time: 00:21 | ||||||
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| 4 +2 | melt bead |
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Answers
44 mins confidence: 
peer agreement (net): +2
peer agreement (net): +2melt bead Explanation: Sounds about right. -------------------------------------------------- Note added at 45 mins (2015-10-22 11:15:59 GMT) -------------------------------------------------- see e.g.: "Short circuiting of an energized electrical conductor can result in high temperature electrical arcing that creates a **melt bead**. Fire investigators often question if a short circuit or arc was the cause or result of fire. A short circuit can obviously cause of fire; a fire can also melt wiring insulation and cause a short circuit. One investigator (Robert Anderson) has proposed a controversial method by which the **melt bead** may be analyzed to answer this question. His methodology is to examine a copper **melt bead** using an Auger Electron Spectroscope (AES). Auger can provide detailed elemental analysis from a very shallow surface layer. The instrument is also set up with ion milling, where charged ions are used to erode away successive layers of metal surface, which are then subject to Auger analysis. Anderson proposes that the trends of elemental concentration within the **melt bead** can be related to whether the bead was formed during a normal atmosphere, or an atmosphere already engulfed in combustion products. He mainly examines carbon content trends. There are numerous qualified materials experts who have cast doubts on Anderson’s methodology, based on metallurgical theory of materials solubility and diffusion, and on the ability to reproducibly perform the intricate analysis required. At this writing there has been no blind testing conducted of a statistically meaningful number of samples to prove that the method is viable." (http://depts.washington.edu/vehfire/ignition/electrical/auge... ) -------------------------------------------------- Note added at 47 mins (2015-10-22 11:17:29 GMT) -------------------------------------------------- "Testing included macro and microphotgraphy, scanning electron microscopy (SEM), x-ray mapping, and energy dispersive spectroscopy (EDS). It was determined that the suspected arc beads were actually **melt beads**, and that they were the result of, rather than the cause of, the fire." (http://www.metallurgist.com/crock-pot-fire.html ) -------------------------------------------------- Note added at 1 day10 hrs (2015-10-23 21:16:13 GMT) -------------------------------------------------- :) |
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