lsaw-Longitudinally Submerged Arc Vuam (longitudinally Submerged Arc Vuam, luv luv li LSAW). Longitudinal submerged arc welded yeeb nkab (LSAW) yog tsim los ntawm kev siv ib qho nruab nrab thiab tuab phaj raws li cov khoom siv raw, nias (rolling) steel phaj hauv pwm los yog ua tshuab rau hauv lub raj tsis muaj, siv ob sab submerged arc vuam thiab nthuav dav. txoj kab uas hla. Cov khoom tiav lawm muaj ntau yam specifications, thiab cov weld muaj zoo toughness, plasticity, uniformity thiab compactness. Nws muaj qhov zoo ntawm txoj kab uas hla loj, yeeb nkab phab ntsa thickness, siab siab tsis kam, tsis kub tsis kam thiab muaj zog corrosion kuj.
Thaum tsim cov kav dej muaj zog, siab tawv, thiab cov kav dej ntev ntev thiab cov pa roj, feem ntau ntawm cov kav hlau uas xav tau yog cov kav dej loj-txheej-phab ntsa LSAW. Raws li API cov qauv, nyob rau hauv cov kav dej loj thiab cov roj tsheb thauj mus los, thaum dhau los ntawm Chav Kawm 1 thiab Chav Kawm 2 xws li thaj chaw alpine, seabeds, thiab cov nroog uas muaj neeg coob, LSAW kav yog tib hom yeeb nkab uas siv tau. Raws li kev sib txawv molding, nws tuaj yeem muab faib ua:
UOE welded yeeb nkab: Tom qab ib leeg steel phaj yog pre-khoov ntawm ntug, nws undergoes U forming, O forming, internal welding, sab nraud vuam, mechanical txias expansion thiab lwm yam txheej txheem;
JCOE welded yeeb nkab: Pre-welding, sib sau, thiab txias expanding tom qab vuam raws li "JCOE";
HME welded yeeb nkab: Nws yog tsim los ntawm mandrel dov txoj kev raws li "CCO", thiab tom qab vuam, nws yog txias-expanded.
