ERW yeeb nkab thiab LSAW yeeb nkab yog ob qho tib si ncaj seam welded kav, uas yog siv rau kev thauj mus los, tshwj xeeb tshaj yog cov kav dej ntev rau cov roj thiab roj. Qhov sib txawv tseem ceeb ntawm ob yog cov txheej txheem vuam. Cov txheej txheem sib txawv ua rau cov yeeb nkab muaj cov yam ntxwv sib txawv thiab tsim nyog rau cov xwm txheej sib txawv.

Lub ERW raj siv cov vuam siv hluav taws xob ntau zaus thiab siv cov kub dov broadband steel coils ua raw khoom. Raws li ib qho ntawm cov kav dej ntau tshaj plaws niaj hnub no, vim yog kev siv cov dov steel strips / coils nrog cov qauv thiab meej tag nrho qhov ntev raws li cov ntaub ntawv raw, nws muaj qhov zoo ntawm qhov siab qhov tseeb, cov phab ntsa tuab, thiab cov khoom zoo. Cov yeeb nkab muaj qhov zoo ntawm luv weld seam thiab siab siab, tab sis cov txheej txheem no tsuas tuaj yeem tsim cov kav dej me me thiab nruab nrab-ntev nyias-walled (nyob ntawm seb qhov loj ntawm cov hlau sawb lossis steel phaj siv los ua cov khoom siv raw). Lub weld seam yog feem ntau grey me ntsis, unfused, grooves Corrosion defects. Tam sim no cov cheeb tsam uas siv dav yog hauv nroog cov pa roj thiab cov khoom siv roj av.

LSAW yeeb nkab siv cov txheej txheem submerged arc vuam, uas siv ib qho nruab nrab-tuab phaj ua cov khoom siv raw, thiab ua cov vuam sab hauv thiab sab nraud ntawm qhov chaw vuam thiab nthuav tawm txoj kab uas hla. Vim muaj ntau yam khoom tiav siv steel daim hlau ua raw cov ntaub ntawv, cov welds muaj zoo toughness, plasticity, uniformity thiab compactness, thiab muaj qhov zoo ntawm cov yeeb nkab loj txoj kab uas hla, yeeb nkab phab ntsa thickness, siab tsis kam, kub tsis kam thiab corrosion kuj. . Thaum tsim cov high-strength, high-toughness, high-zoo nyob deb cov roj thiab roj pipelines, feem ntau ntawm cov steel kav yuav tsum tau loj-inch tuab-walled ncaj seam submerged arc welded kav. Raws li API tus qauv, nyob rau hauv cov roj thiab cov kav dej loj, thaum dhau ntawm Chav Kawm 1 thiab Chav Kawm 2 thaj chaw xws li thaj chaw alpine, seabeds, thiab cov neeg nyob hauv nroog loj, ncaj seam submerged arc welded kav yog tib hom yeeb nkab.