* Q1:Vim li cas cov khoom siv tawv tsis muaj zog rau h - Beams siv hauv LNG cia tso tsheb hlau luam?
* A1:Liquefied nkev (lng) cia ua haujlwm nyob rau ntawm ib puag ncig {}} 162℃({}} Siab nyuaj ua kom lub h {{8} Cov khoom siv nqaj tuaj yeem nqus lub zog tseem ceeb ua ntej tawg, txawm tias huab cua sov. Qhov no yog qhov tseem ceeb rau nrog nrog kev ua haujlwm hnyav, thermal contaction kev ntxhov siab, thiab muaj peev xwm cuam tshuam kev thauj khoom thaum kev tsim kho lossis kev pabcuam. Brittle Bacture Qhov pib ntawm qhov tsis txaus ntseeg (Weld, Notch) tuaj yeem tawm tsam sai ntawm cov tswv cuab tseem ceeb. Yog li ntawd, H-Beams rau lng tso tsheb hlau luam yuav tsum muaj cov hlau nrog tshwj xeeb cov charpy v-motch cuam tshuam lub zog ntawm kev tsim hluav taws xob.
* Q2:Yuav ua li cas "Nil - Ductility Hloov" (NDT) Kub Kub "}} tsov ci steel xaiv?
* A2:Nil {- Ductility Kev Hloov (NDT) qhov chaw nyob hauv qab no uas cov kev hloov pauv ntawm cov hlau (tearing) rau hom (cleavage) bacture hom. Rau cryogenic h- ci ci, cov hlau lub ndt kub yuav tsum muaj qis dua qhov tsawg kawg nkaus kev ua haujlwm kub. Qhov no muab cov npoo kev nyab xeeb tiv thaiv brittle lov. Cov hlau yog xaiv thiab ua tiav (piv txwv li, kev coj ua zoo, li qub, quench & Temperically rau kev tawm tsam lub ndt kub. Piv txwv li kev sim ntau (piv txwv li, poob ceeb thawj lub kua muag sim- dwtt) tus xeeb ntxwv ntawm NDT. Cov lus qhia tshwj xeeb tsim nyog rau cov hlau uas muaj tsawg kawg yog 10-15℃hauv qab no cov kev coj ua hluav taws xob tsawg (MDMT) kom ntseeg tau tias muaj kev thauj khoom hauv txhua qhov chaw thau khoom cryogenic.
* Q3:Yuav ua li cas ib cov txheej txheem vuam yog tsim rau h- Beams hauv cryogenic kev pabcuam?
* A3:Cryogenic vuam xav tau stroor rigor: tsuas yog low {{} hydrogen welret cov txheej txheem, pom, gmaw, gmaw nrog nruj roj tswj) raug tso cai. Cov hlau ua tub rog yuav tsum sib phim lub hauv paus hlau lub cryogenic nyuaj thiab muaj tsawg diffusion hydrogen qib (<5ml/100g). Stringent preheating (often 100-150°C+) and controlled interpass temperatures prevent hydrogen-induced cracking and reduce cooling rates. Post-Weld Heat Treatment (PWHT) is frequently mandatory for stress relief and tempering the Heat-Affected Zone (HAZ). Welding Procedure Specifications (WPS) undergo rigorous qualification testing, including Charpy V-notch tests on weld metal and HAZ samples at the design temperature. Non-Destructive Testing (NDT) coverage is extensive (e.g., 100% RT or UT).
* Q4:Yuav ua li cas ua thermal feem cuam tshuam cuam tshuam rau tus qauv ntawm h - nqaj txhawb nqa hauv cov nroj tsuag cryogenic?
* Q4:Tseem ceeb thermal thermal feem tshwm li h - ci ci txias los ntawm ambient kom cryogenic kub. Txhawb cov tshuab yuav tsum tau haum qhov kev txav no tsis muaj kev ntxhov siab dhau kev ntxhov siab. Zawv zawg bearings, lauj kaub bearings, los yog tshwj xeeb tsawg {{}} kev sib txhuam kom muaj kev txav mus ntev. Cov lus qhia tiv thaiv kev hloov chaw tom qab thaum tso cai. Cov ntsiab lus tas ruaj ruaj yog cov tswv yim nyob rau kev tswj cov kev coj ua thiab hloov cov khoom siv txuas ntxiv. Txhawb cov kab teeb yuav xav tau thermal cabration los ntawm cov nkoj txias heev. Cov qauv kev ntsuas yuav tsum muaj cov qauv ntsuas qhov ntsuas kub thiab ua kom muaj zog rau cov neeg uas muaj zog thiab cov neeg sib txuas tau zoo. Yog tsis muaj kev sib txuas lus tuaj yeem ua rau nqaj nqaj nqaj buckling, kev sib txuas tsis ua haujlwm, lossis kev puas tsuaj rau cov khoom sib txuas.
* Q5:Dab tsi yog qhov zoo ntawm kev siv nickel -}}} alloy alloy alloy aliecks {4 4} Beams?
* A5:Nickel -} Cov hlau aliroed nyuaj siab: Nicke} {2} {{{} - 196 degree. Lawv muaj lub zog siab ntawm cov huab cua txias heev, tso cai rau cov ntu sib zog muaj ntau dua piv rau cov phiaj hlau tuab cov hlau. Lawv muaj weldability zoo thaum siv tau tshaj xickel {}}} aliece} Cov txheej txheem tsim qauv thiab cov ntawv sau ua pov thawj zoo li cov tso tsheb hlau luam lng. Thaum ntau tus nqi pib, nws kev ntseeg tau thiab ua tau zoo hauv huab cua kom qhia tau tias nws siv rau cov tswv cuab thawj.
