WHY THE Requirement FOR POST WELD HEAT TREATMENT? #4
Post weld heat treatment in the specific situation depicted here alludes to the procedure of warming a weld to beneath the lower change temperature at a controlled rate, holding for a particular time and cooling at a controlled rate. No thought has been given to normalizing of welds in carbon-manganese and low composite steels, to arrangement tempering of hardened steels or to any precipitation solidifying medications to other compound materials. In this way, nearly by prohibition, the materials included will be CManganese steels, C-Mo, 1¼Cr½Mo, 2¼Cr1Mo, 5Cr1Mo, 9Cr1Mo and 12Cr1MoV steels.
WHY THE Requirement FOR POST WELD Warmth TREATMENT?
Lingering Pressure The advancement of lingering stresses drawing nearer or in any event, surpassing the yield stress is conceivable when welding thick areas. For certain industry divisions, eg. Petrochemical, Compound, Oil and Gas, and so forth. the presence of lingering worry of this greatness is totally unsuitable. With pressure hardware working at 2000 C and beneath an assortment of stress erosion breaking instruments under the general term “ecological breaking” become predominant. There is likewise the issue of weariness to be considered and the impact that leftover ctable anxieties have in such manner.
Different enterprises, for example, Force Age have various contemplations, and the pressure created because of warm extension of pipework can take on a far more noteworthy criticalness than lingering worry due to welding. It is fascinating to take note of that it can be appeared (1) by the utilization of the Larson-Mill operator parameter that lingering worries in non-post weld heat treated welds are completely loose after around 20,000 hours at a help temperature of 5400 C.
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