Heat up fatigue invalidation and measure of gush bolus aggrandizement

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  • source:EDON CNC Machining
Heating up what fatigue hot exhaustion points to is a metal in the loop hot load operating mode falls, as a result of inhomogenous the fatigue invalidation that heats to be caused with refrigeration. The metal heats quickly and cool, be in cross section place to be able to cause bigger hot gradient, bring about expand inhomogenously and contract. When the metal some area tries dilate leaves, get however material is colder, thicker of area when holding back, with respect to meeting herein generation enough stress makes the metal succumbs. Hot exhaustion differs to lift with the temperature that by machinery of the loop below high temperature stress causes fatigue. But these two kinds of fatigue forms are normally coinstantaneous, because at the same time experience temperature raises a lot of parts suddenly,pelter is mixed hand in change load action. Applied case is analysed - the hot exhaustion crackle with the very big discovery on the feed water heater of 8 high pressure that feed water heater uses in some power plant. These high-pressured heater are below high temperature and hot fatigue environment the job. Open and shutting is to cause hot exhaustion, the working temperature below normal is C) of ° of F (250-350 of 480-660 ° . In store suffer between water room and tube plate solder the area of hot influence forms annular crack. These fatigue crackle are the following to heater use danger sex is very big. Undertake throwing ball to crackle craze place so / gush bolus aggrandizement. Track result discovery, after classics aggrandizement, after feed water heater of 8 high pressure is continueing to work 5 years, arise without new crackle, original crackle was prevented by effective ground patulous. (End) CNC Milling CNC Machining