Thick-walled kauv steel yeeb nkab yog ib txoj kev ntawm arc vuam nyob rau hauv cov txheej txheem flux. Nws yog tsim los ntawm kev siv cov cua sov uas tsim los ntawm qhov hluav taws kub ntawm qhov hluav taws xob thiab cov vuam hlau nyob rau hauv cov txheej txheem flux, lub hauv paus hlau, thiab cov welded vuam hlau flux.

Thaum lub sij hawm siv, lub ntsiab kev nyuaj siab ntawm tuab-walled kauv steel kav, uas yog, qhov sib npaug ntawm qhov tsis xws luag nyob rau hauv lub axis kev taw qhia ntawm cov yeeb nkab steel, yog me dua li ntawm ncaj seam kav; Yog tias cov yeeb nkab ntev yog L, qhov ntev vuam yog L / cos (θ). Muaj kev sib cav ntev ntev ntawm cov kav hlau kav thiab cov kav dej ncaj nraim. Ua ntej, vim tias qhov tsis xws luag yog sib npaug rau cov welds, rau cov kav hlau kav hlau, qhov tsis xws ntawm cov welds yog "oblique defects". Thib ob, pipeline steels yog tag nrho cov dov steel phaj. , qhov cuam tshuam toughness muaj anisotropy loj, CVN tus nqi raws li qhov kev taw qhia dov tuaj yeem yog 3 npaug siab dua li CVN tus nqi perpendicular mus rau dov kev taw qhia, qhov vuam seam ntawm kauv steel yeeb nkab yog ntev dua li ntawm cov yeeb nkab ncaj seam, tshwj xeeb tshaj yog piv nrog UOE steel yeeb nkab Ib qho teeb meem zoo dua, nrog rau kev txhim kho ntawm kauv steel yeeb nkab tsim tshuab niaj hnub no, peb yuav tsum ntsuas thiab sib piv kom meej thiab raug, thiab rov nkag siab txog qhov teeb meem ntawm cov kav hlau ntev ntev welds.

Lub hauv paus tseem ceeb ntawm kev ntxhov siab ntawm cov kav dej tuab-walled kauv steel yog raws nraim perpendicular rau cov kev taw qhia ntawm cov yeeb nkab qhov cuam tshuam. Kauv seam submerged arc welded steel kav yog tsim los ntawm khoov kub-kuav los tiag sawb hlau nyob rau hauv ib tug kauv zoo, thiab sab hauv thiab sab seams yog welded los ntawm tsis siv neeg submerged arc vuam. Nws yog tsim los rau hauv ib tug kauv seam steel yeeb nkab, thiab cov kauv steel yeeb nkab staggers cov kev taw qhia ntawm cov yeeb nkab tej yam kuj, tig qhov tsis zoo ntawm ib tug ntev weld seam ntawm kauv steel yeeb nkab mus rau hauv ib tug kom zoo dua. Nws tuaj yeem siv dav hauv kev tsim cov kav hlau loj loj rau cov laj thawj hauv qab no:
1) Vim nws tsis tu ncua khoov thiab tsim, qhov ntev ntawm cov yeeb nkab steel tsis txwv;
2) Ntev npaum li lub kaum sab xis hloov pauv, cov kav hlau steel ntawm ntau txoj kab uas hla tuaj yeem tsim los ntawm cov hlua hlau ntawm tib qhov dav;
3) Yooj yim hloov qhov loj me, haum rau kev tsim cov khoom me me thiab ntau yam ntawm cov kav dej steel;
4) Cov welds yog spirally faib tusyees tshaj tag nrho cov ncig ntawm cov yeeb nkab steel, yog li cov yeeb nkab steel muaj qhov tseeb qhov tseeb thiab lub zog siab.