**1. Nqe Lus Nug: Dab tsi yog qhov sib txawv ntawm ERW (Electric Resistance Welded) thiab SAW (Submerged Arc Welded) cov kav dej, thiab cov ntawv thov twg feem ntau siv?**
** Teb:** Qhov sib txawv tseem ceeb nyob hauv cov txheej txheem vuam. ** ERW kav ** yog tsim los ntawm ib txoj hlua ntawm cov hlau dov rau hauv lub tog raj kheej, thiab cov seam yog welded los ntawm kev siv lub siab - zaus hluav taws xob tam sim no rau cov npoo, fusing lawv yam tsis muaj cov hlau muab tub lim. Lawv feem ntau yog siv rau qis mus rau nruab nrab- cov ntawv siv siab xws li cov kav dej, laj kab, thiab cov laj thawj tsim qauv. ** SAW kav **, ntawm qhov tod tes, koom nrog kev tsim cov phaj thiab vuam seam (los yog seams) nyob rau hauv ib daim pam ntawm granular flux. Ib qho arc yog submerged hauv qab no flux, siv cov xaim txuas txuas ntxiv. Qhov no tsim qhov sib sib zog nqus, muaj zog weld, ua rau SAW cov kav dej haum rau siab - siab, cov ntawv thov tseem ceeb xws li ntev - cov roj thiab roj xa mus rau cov kav dej thiab cov qauv sab nrauv.
**2. Lo lus nug: Vim li cas tom qab -weld heat treatment (PWHT) feem ntau ua rau cov kav dej welded, thiab nws cov txiaj ntsig tseem ceeb yog dab tsi?**
** Teb:** Post-weld heat treatment yog ib txoj kev tswj cov cua sov thiab txias cov yeeb nkab welded. Nws yog ua tiav rau ob qho laj thawj:
* ** Kev Nyuaj Siab: ** Nws txo cov kev ntxhov siab uas nyob hauv qhov chaw vuam thaum lub sij hawm cua kub ceev thiab txias ntawm cov txheej txheem vuam. Qhov no txhim kho cov yeeb nkab qhov seem stability thiab tsis kam rau kev ntxhov siab corrosion cracking.
* ** Txhim kho cov cuab yeej cuab yeej cuab tam:** Nws tuaj yeem kho cov qauv nplej hauv tshav kub -Tebchaws cuam tshuam (HAZ), ua rau nws tawv dua thiab muaj zog dua, uas yog qhov tseem ceeb rau cov kav dej uas yuav ua haujlwm hnyav lossis qis - qhov kub thiab txias.
**3. Nqe Lus Nug: Dab tsi yog qhov tseem ceeb ntawm "Heat-Afected Zone (HAZ)" nyob rau hauv cov yeeb nkab welded, thiab vim li cas nws yog ib qho tseem ceeb rau kev soj ntsuam?**
** Teb:** Thaum tshav kub kub-Teb chaws cuam tshuam (HAZ) yog thaj tsam ntawm cov hlau puag uas tsis tau yaj thaum lub sij hawm vuam tab sis muaj nws cov microstructure thiab cov khoom hloov pauv los ntawm cov cua kub hnyav. Nws yog ib qho chaw soj ntsuam tseem ceeb heev vim nws feem ntau yog qhov tsis muaj zog tshaj plaws ntawm cov welding. Kev kub ceev ceev tuaj yeem ua rau HAZ nyuaj thiab nkig ntau dua li cov hlau welded lossis cov hlau qub, ua rau nws muaj kev cuam tshuam rau kev tawg, txo corrosion kuj, thiab tsis ua hauj lwm hauv kev ntxhov siab.
** 4. Nqe Lus Nug: Cov khoom tseem ceeb dab tsi txawv cov kav dej tsim raws li API 5L thiab ASTM A53 tus qauv?**
** Teb: ** Thaum ob qho tib si yog cov lus qhia tshwj xeeb rau cov yeeb nkab steel, lawv tsom rau kev lag luam sib txawv:
* ** API 5L (American Petroleum Institute):** Cov spec no yog tshwj xeeb rau cov kav dej thauj mus los hauv kev lag luam roj av thiab roj av. Nws muab qhov tseem ceeb rau kev ua kom tawv nqaij, tshuaj lom neeg muaj pes tsawg leeg (xws li, txwv tsis pub cov pa roj carbon sib npaug rau kev sib txuas), thiab nruj tsis yog -kev ntsuas kev puas tsuaj (NDT) yuav tsum ua kom muaj kev ncaj ncees nyob rau hauv siab.
* ** ASTM A53 (American Society for Testing and Materials):** Qhov no yog qhov dav dav dua -lub hom phiaj specification rau dub thiab kub-dip galvanized steel yeeb nkab. Nws yog feem ntau siv rau kev siv tshuab thiab siab (xws li cov kav dej, chav dej, thiab cua) nrog rau kev siv cov qauv. Nws cov kev xeem yuav tsum muaj feem ntau tsis nruj dua li API 5L, tshwj xeeb tshaj yog rau Qib A.
**5. Lus Nug: Nyob rau hauv cov ntsiab lus ntawm welded yeeb nkab manufacturing, qhov txawv ntawm ib tug "longitudinal" seam thiab "kauv" (los yog helical) seam yog dab tsi?
** Teb: ** Qhov no yog hais txog kev taw qhia ntawm lub vuam seam.
* **Longitudinal Seam:** Weld seam khiav hauv txoj kab ncaj nraim mus rau lub yeeb nkab ntev. Qhov no yog hom ntau tshaj plaws rau ERW thiab ib leeg -seam SAW kav. Kev tsim khoom yog feem ntau yooj yim dua thiab sai dua rau cov qauv loj.
* ** Kauv (Helical) Seam: ** Lub vuam seam spirals nyob ib ncig ntawm cov yeeb nkab zoo li lub helix. Txoj kev no tso cai rau kev tsim cov kav dej loj - txoj kab uas hla los ntawm txoj kab nqaim hlau lossis phaj. Kauv cov kav dej feem ntau tuaj yeem tiv taus qhov nyuaj, ntau- cov kev taw qhia kev ntxhov siab thiab feem ntau siv rau hauv pawg, loj - txoj kab uas hla dej loj, thiab qee qhov kev siv hauv paus.
