Taw qhia
Kev tsim khoom ntawmLongitudinal Submerged Arc Welded (LSAW) kavyog cov txheej txheem kev lag luam tswj tau zoo tsim los tsim cov kav loj loj - txoj kab uas hla, tuab- phab ntsa, thiab siab - cov kav dej muaj zog rau kev lag luam xav tau. Thaum lub ntsiab lusLSAW Pipes thiab Lawv Daim Ntawv Thovmuab cov ntsiab lus ntawm LSAW yeeb nkab yam ntxwv thiab kev siv, qhov no sub- tsab xov xwm dhia tob rau hauv kev ua haujlwm tiav.
Kev nkag siab txog cov txheej txheem no yog qhov tseem ceeb rau cov kws ua haujlwm hauv raj xa dej, pab pawg muag khoom, cov neeg cog lus, thiab txhua tus neeg koom nrog hauv cov roj thiab roj, kev thauj mus los hauv dej, kev tsim kho sab nrauv, lossis kev tsim kho. Txhua theem -los ntawm kev xaiv raw khoom mus rau qhov kawg hydrostatic test- pab txhawb rau kev ua tau zoo ntawm LSAW kav yog paub rau.
1. Raw Material Xaiv: Lub hauv paus ntawm Kev Ua Zoo
Kev tsim cov kav dej LSAW pib nrog siab- cov ntawv hlau zoo, feem ntau yog tsim los ntawm kev tswj dov lossis thermo-txheej txheem tswj kev ua haujlwm (TMCP). Cov paib yuav tsum muaj cov khoom siv zoo tagnrho: lub zog tensile siab, zoo ductility, thiab tiv thaiv corrosion thiab tawg propagation.
Steel Qib thiab Standards
Common specifications muaj xws li:
- API 5L (Qib B rau X80)
- ASTM A672 / A671 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / A671 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672 / ASTM A672) thiab ASTM A672
- EN 10219 / EN 10210
Cov qib siab- cov phaj siab kom ntseeg tau tias cov yeeb nkab tuaj yeem tiv taus qhov siab sab hauv, qhov chaw tsis zoo, thiab ntev - lub sij hawm ua haujlwm kev ntxhov siab.
Kev tshuaj xyuas phaj
Ua ntej tsim, txhua lub phaj steel undergoes:
- Kev kuaj pom
- Dimensional checks
- Ultrasonic scanning rau sab hauv tsis xws luag
Tsuas yog cov phaj tsis muaj qab hau tau nkag mus rau hauv theem tsim.
2. Ntug Milling: Npaj rau Vuam
Ntug milling tshuab txiav cov hlau phaj npoo kom cov kaum ntse ntse. Qhov no ua kom:
- Zoo meej haum- thaum lub sij hawm vuam seam
- Ua tiav weld nkag
- Txo txoj kev pheej hmoo ntawm vuam tsis xws li porosity lossis tsis tiav fusion
Smooth, cov npoo tsis sib xws yog qhov tseem ceeb kom ua tiav qhov muaj zog thiab txhim khu kev qha weld seam.
3. Kev tsim cov yeeb nkab: UOE thiab JCOE txheej txheem
Kev tsim tshuab txhais tau qhov tseeb qhov tseeb thiab kev ua haujlwm ntawm cov yeeb nkab.
Txheej txheem UOE
Txoj kev UOE yog qhov zoo dua rau qhov loj - txoj kab uas hla, tuab - cov kav xa dej.
- U-puab nias
- O-puab nias
- Expansion (E theem)ua kom cov kab loj me me kom ua tiav zoo meej roundness
Cov txheej txheem nthuav dav txhim kho qhov tseeb qhov tseeb thiab txo qhov kev ntxhov siab seem.
JCOE Process
JCOE txoj kev sib sau ua rau lub phaj txuas ntxiv mus:
- J-nias
- C-nias
- O- ua
- Txias expansion
Nws yog qhov hloov tau yooj yim, haum rau qhov nruab nrab thiab loj diameters, thiab zoo tagnrho rau me me -batch ntau lawm.
Ob leeg UOE thiab JCOE tsim cov kav dej uas muaj qhov zoo sib xws thiab kev ua haujlwm zoo.
4. Tack Welding thiab Internal Vuam
Thaum cov hlau phaj yog tsim rau hauv ib lub cylindrical zoo, nws yog tack welded los tuav daim ntawv nyob rau hauv qhov chaw rau qhov loj welding hauj lwm.
Internal SAW Vuam
SivSubmerged Arc Welding (SAW), sab hauv ntawm cov yeeb nkab yog welded ua ntej.
Qhov zoo:
- Sib sib zog nqus weld nkag
- High deposition tus nqi
- Tsawg kawg vuam tsis xws luag
Internal weld muab lub hauv paus rau cov yeeb nkab lub cev muaj zog.
5. Sab nraud Submerged Arc Vuam
Tom qab kev vuam sab hauv tiav, cov yeeb nkab txav mus rau sab nraud SAW vuam chaw nres tsheb. Qhov thib ob weld:
- Ua tiav kev nkag mus rau sab nraud
- Xyuas kom ib tug du, uniform weld hlaws
- Ua qhov siab tshaj plaws seam zog
Sab hauv thiab sab nraud SAW welding ua ke lav cov yeeb nkab ua tau raws li lossis dhau txoj kab nruj heev - cov qauv yeeb nkab.
6. Kev kho cua sov: Kev ntxhov siab thiab kev ua kom zoo dua qub
LSAW cov kav dej, tshwj xeeb tshaj yog tuab- cov phab ntsa, yuav tsum tau kho cua sov kom tshem tawm cov vuam -kev ntxhov siab.
Cov kev kho cua sov uas muaj xws li:
- normalizing
- Quenching + Tempering
- Tom qab-weld heat treatment (PWHT)
Cov txiaj ntsig muaj xws li:
- Txhim kho toughness
- Txhim khu kev tiv thaiv rau brittle puas
- Zoo dua qhov seem stability
Cov kauj ruam no yog ib qho tseem ceeb rau cov kav dej ua haujlwm nyob rau hauv kev kub siab lossis kub hloov pauv.
7. Mechanical Expansion: Ua kom zoo meej Roundness
Mechanical expansion yog siv los txo qhov seem seem thiab txhim kho kev ncig (ovality).
Cov txiaj ntsig muaj xws li:
- Qhov zoo tshaj plaws kev ua haujlwm vuam
- Siab dua geometric raug
- Ua kom muaj kev nyab xeeb ntxiv
Cov txheej txheem no ua kom cov yeeb nkab haum seamlessly nrog cov kav dej uas nyob ib sab.
8. Tsis yog-Kev Ntsuam Xyuas Kev Puas Tsuaj (NDT): Cov Tub Ntxhais Kev Ncaj Ncees
LSAW cov kav dej tau txais kev tshuaj xyuas tag nrho NDT, deb tshaj ntau lwm yam yeeb nkab.
Kev kuaj ultrasonic (UT)
Siv los txheeb xyuas:
- Lamination defects
- Weld fusion teeb meem
- Internal suav nrog
Kev ntsuas hluav taws xob (RT)
X-ray lossis gamma{1}}ray imaging ua kom ntseeg tau qhov kev sib raug zoo ntawm cov vuam thiab kuaj pom qhov tsis zoo.
Sib Nqus Particle Test (MT)
Siv rau:
- Nto tawg
- Weld ntiv taw defects
Kev Ntsuas Hydrostatic
Txhua lub yeeb nkab tau ntim nrog dej thiab nias kom paub meej tias nws tuaj yeem tiv taus kev ua haujlwm siab yam tsis muaj qhov xau.
9. Beveling thiab tiav
Cov yeeb nkab kawg yog beveled los npaj lawv rau qhov chaw vuam.
Kev ua tiav kuj suav nrog:
- Kev tu qhov chaw
- Dimensional rov-check
- Kos npe thiab traceability coding
Txoj kev beveling kom muaj zog weld pob qij txha hauv thaj teb.
10. Txheej thiab ntim
Raws li cov neeg siv khoom xav tau, cov kav dej yuav tau txais:
- 3LPE lossis 3LPP txheej
- FBE txheej
- Internal epoxy txheej
- Coal tar los yog bitumen txheej
Cov coatings no txhim kho corrosion kuj thiab txo cov dej sib txhuam hauv cov yeeb nkab.
Cov txheej txheem ntim khoom muaj xws li:
- Bundling
- Ntoo txhawb
- Hlau strapping
- Kev tiv thaiv kawg caps
Xaus
Kev tsim cov kav dej LSAW yog cov ncauj lus kom ntxaws, cov txheej txheem tsim kho uas xav tau qhov tseeb, cov cuab yeej siv siab heev, thiab kev tswj xyuas kom zoo. Txhua theem-los ntawm kev tshuaj xyuas cov phaj nyoos mus rau kev sim hydrostatic- kom ntseeg tau tias cov khoom tiav tuaj yeem ua tau zoo hauv kev lag luam tseem ceeb thoob ntiaj teb.
Rau kev saib xyuas ntawm LSAW yeeb nkab cov khoom, cov yam ntxwv, thiab cov ntawv thov, koj tuaj yeem nyeem peb cov lus qhia tseem ceeb:LSAW Pipes thiab Lawv Daim Ntawv Thov.
