**1. Nqe Lus Nug: Dab tsi yog qhov txawv ntawm ERW (Electric Resistance Welded) thiab SAW (Submerged Arc Welded) cov kav dej, thiab lawv cov ntawv siv li cas? **
** Teb:** Cov tub ntxhais sib txawv yog nyob rau hauv cov txheej txheem vuam thiab cov yeeb nkab ua tau loj thiab lub zog.
* ** ERW Pipes: ** Tsim los ntawm dov steel sawb thiab siv cov hluav taws xob tam sim no los fuse cov npoo yam tsis muaj cov hlau muab tub lim. Weld seam feem ntau yog cua sov- kho kom normalize nws. Lawv feem ntau yog siv rau kev siv qis rau nruab nrab siab, xws li cov kav dej, laj kab, thiab cov laj thawj tsim. Qhov ntau thiab tsawg yog feem ntau me dua hauv txoj kab uas hla.
* ** SAW Pipes: ** Tsim los ntawm dov steel phaj thiab vuam cov seam nyob rau hauv ib daim pam ntawm fusible flux, uas tiv thaiv sparks thiab huab cua paug. Cov txheej txheem no siv cov hlau txuas txuas ntxiv. Cov kav dej SAW paub txog lawv lub zog siab thiab siv rau qhov loj - txoj kab uas hla, siab - cov ntawv thov siab, xws li cov kav dej xa hluav taws xob, thiab cov kav dej.
**2. Nqe Lus Nug: Vim li cas tom qab -weld heat treatment (PWHT) feem ntau ua rau cov kav dej welded?**
** Teb:** Post-weld kho cua sov, tshwj xeeb tshaj yog normalizing los yog kev ntxhov siab, yog ua rau ob lub ntsiab lus:
* ** Txhawm rau Txhim Kho Microstructure:** Cov txheej txheem vuam tsim kom muaj cua sov- thaj chaw cuam tshuam (HAZ) nrog qhov sib txawv, feem ntau nkig, cov qauv nplej ntau dua li cov hlau hauv paus. PWHT refines no grain qauv, txhim kho cov yeeb nkab lub toughness thiab mechanical zog.
* ** Txhawm rau txo qis kev ntxhov siab:** Vuam qhia cov kev ntxhov siab sab hauv thaum cov hlau ua kom sov thiab txias. PWHT maj mam ua kom sov thiab txias tag nrho cov yeeb nkab kom txo tau cov kev ntxhov siab no, uas txo qis kev pheej hmoo ntawm kev cuam tshuam thiab kev ntxhov siab corrosion tawg hauv kev pabcuam.
**3. Nqe Lus Nug: Tus qauv ASTM A53 qhia tau dab tsi, thiab Qib B yeeb nkab txawv ntawm qib A yeeb nkab li cas?**
** Teb:** ASTM A53 yog tus qauv specification rau dub thiab kub -dipped galvanized steel kav. Nws npog peb hom: F (lub qhov cub taub qab -welded), E (hluav taws xob-kuj welded), thiab S (seamless). Qhov sib txawv tseem ceeb ntawm cov qhab nia yog:
* ** Qib A: ** Muaj lub zog tensile yam tsawg kawg nkaus ntawm 48,000 psi (330 MPa) thiab lub zog qis kawg nkaus ntawm 30,000 psi (205 MPa).
* ** Qib B: ** Muaj lub zog tensile tsawg dua ntawm 60,000 psi (415 MPa) thiab siab dua qhov ua tau zoo ntawm 35,000 psi (240 MPa).
Qib B muaj zog dua thiab yog li siv ntau dua rau kev siab - muaj cov ntawv thov, thaum Qib A yog qhov tsim nyog rau cov qauv lossis qis - siv siab.
** 4. Nqe Lus Nug: Nyob rau hauv cov ntsiab lus ntawm cov roj thiab cov kav dej, txhais tau li cas los ntawm "Line Pipe" thiab dab tsi yog cov khoom tseem ceeb uas nws yuav tsum muaj?**
** Teb:** "Line Pipe" yog hais txog cov welded steel kav uas tsim tshwj xeeb rau kev thauj cov roj, roj, thiab lwm yam hydrocarbons mus ntev. Cov khoom tseem ceeb muaj xws li:
* **High Yield Strength:** Kom tiv taus siab sab hauv.
* **Zoo heev Toughness:** Los tiv thaiv kev tawg tawg, tshwj xeeb tshaj yog nyob rau hauv qis - qhov kub thiab txias.
* ** Zoo Weldability: ** Kom tso cai rau kev txhim khu kev qha teb girth vuam thaum lub sij hawm tsim kho kav.
* **Resistance to Hydrogen-Induced Cracking (HIC) and Sulfide Stress Cracking (SSC):** Tshwj xeeb tshaj yog tseem ceeb rau cov kav dej uas nqa "qaub" hydrocarbons uas muaj hydrogen sulfide.
**5. Lus Nug: Lub hom phiaj ntawm qhov kawg ntawm cov yeeb nkab welded yog dab tsi, thiab dab tsi yog cov kaum sab xis raws li cov qauv zoo li ASME B16.25?**
** Teb:** Qhov kawg beveled yog ib qho kev npaj ntug uas ua kom muaj kev sib haum xeeb thiab vuam, tshwj xeeb tshaj yog rau pob tw welds ntawm ob ntu yeeb nkab. Nws lub hom phiaj yog los tsim ib qho zawj uas tso cai rau tus welder kom ua tiav qhov kev nkag mus ntawm qhov vuam, ua kom muaj kev sib koom ua ke muaj zog, txuas ntxiv uas tuaj yeem tiv taus kev tsim qauv. Raws li cov qauv zoo li ASME B16.25, cov kaum sab xis sib xws yog:
* ** 37.5 degree:** Lub kaum sab xis zoo heev.
* ** 30℃:** Kuj dav siv.
Lub kaum ntse ntse tshwj xeeb, nrog rau lub hauv paus ntsej muag (av av) thiab hauv paus qhov sib txawv, yog txhais los ntawm Vuam txheej txheem Specification (WPS) rau qhov project.
