Barkhausen noise method (MBN) was applied to obtain the residual stress distribution in an spirally welded pipes for gas pipeline. The paper describes residual stress development during several production steps welded pipes. Residual stress evolutions were observed in the steel plate, after welding pipe, after short production pressure test and after long-term stresstest too. Result of stress level assessment calculated from Barkhausen noise was successfully verified using hole-drilling method. Derived from the performed measurements and their results can be the following conclusions: The application of magneto-elastic method for measurement of residual stresses in any step of the manufacturing process of spirally welded pipes proved to be very effective and enables for the manufacturer to monitor their development and level in far deeper details than when applying 'classical measurement methods' - like, e.g. routing method, eventually X-ray diffraction technique. The measurement process is fully stable and can monitor all changes having occurred in the monitored place along the pipe surface, during both static and dynamic measurements of pressurising, free of other interfering effects. The applied equipment can be used in relatively severe plant conditions. MP patterns (or stress pattern) in the monitored zone prove the anticipated stress patterns for the stress individual components. The obtained results demonstrate that with the pipes of higher strength the levels the shortterm pressure tests fail to cause and apparent relieving residual stresses; the result could be assumed when considering the short time of the pressure action. Short-term pressure testing succeeded in favourable influencing the pipes ovality. A more pronounced decrease of residual stresses occurring in the weld joint vicinity can be attained only as the result of a long-term stress-test. The stress reduction in vicinity of a weld joint for steel grades X60 and X65 is around 1/3 of the initial values found after welding.


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    Title :

    Residual stress evaluation in spirally welded pipes for gas pipeline


    Contributors:


    Publication date :

    2007


    Size :

    12 Seiten, 10 Bilder, 2 Tabellen, 7 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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