Influence of pipe parameters in-service welding and heat input on thermal cycle of onto active gas pipeline

(整期优先)网络出版时间:2007-04-14
/ 1
ThesoftwareofSYSWELDwasusedtobuildmodelandsimulatethermalcycleofin-serviceweldingontoactivegaspipeline.Influenceofpipediameter,wallthicknessandheatinputonthermalcyclewasstudied.Theresultsshowthatt8/5,t8/3andpeaktemperatureofinnersurfacedecreasewhenwallthicknessincreasesfrom5mmto12mm.Butt8/1willincreaseswiththeincreaseofwallthicknessandwilldecreaseafterthewallthicknessislargerthan7mm.Pipediameterhaslittleinfluenceonthermalcycleandthatinfluencecanbeignoredwhenpipediameterisgreaterthan273mm.t8/5,t8/3,t8/1andpeaktemperatureofinnersurfacewillincreasewiththeincreaseofheatinput.