Kev piav qhia ntxaws ntawm pawg-Tsav Ncaj Seam Steel Pipes

Tianjin Lefin Industrial Co., Ltd yog ib lub tuam txhab muaj kev paub ntau tshaj plaws thiab cov chaw muag khoom ntawm cov ncauj lus kom ntxaws txog pawg- tsav tsheb ncaj seam steel kav hauv Suav teb. Thov koj xav tias dawb mus yuav cov lus qhia ntxaws ntxaws ntawm pawg -tsav ncaj seam steel kav los ntawm peb lub hoobkas. Kev pabcuam zoo thiab tus nqi tsim nyog muaj.

Pile-tsav ncaj seam steel kav yog cov tseem ceeb ntawm vuam steel kav rau pawg. Lawv xa mus rau hollow seem steel yeeb nkab Cheebtsam nrog weld seams parallel mus rau lub longitudinal axis ntawm cov yeeb nkab steel, tshwj xeeb tshaj yog siv nyob rau hauv lub hauv paus pawg ntawm lub hauv paus tej yaam num. Lawv yog cov khoom siv tseem ceeb rau cov yeeb nkab steel thiab cov kav dej hauv cov khoom siv niaj hnub geotechnical engineering. Raws li cov txheej txheem tsim khoom, lawv tuaj yeem muab faib ua ob pawg loj: "Straight Seam Submerged Arc Welding Steel Pipes (LSAW, lub ntsiab lus tseem ceeb rau cov loj-}inch tuab- cov phab ntsa pawg, suav txog ntau dua 70% ntawm qhov siab- kawg pawg yeeb nkab ua lag luam)" thiab "Straight Pipes High Resimp Weld Seam (ERW/HFW, nruab nrab thiab me - txoj kab uas hla ntawm cov kav dej)". Ob qho tib si muaj kev sib faib meej ntawm kev ua tau zoo, kev qhia tshwj xeeb, thiab cov xwm txheej siv tau.

Lub luag haujlwm tseem ceeb ntawm pawg ncaj seam steel yeeb nkab yog txhawm rau nqa ntsug loads, hloov lub zog los ntawm cov qauv sab saud mus rau qhov sib sib zog nqus av txheej, thiab tseem dais cov av siab, dej siab thiab kab rov tav loads. Nws yog siv nyob rau hauv plaub engineering teb:

1. Super siab-nce thiab hnyav- lub luag haujlwm tsim lub hauv paus: Cov kab tseem ceeb ntawm super siab- nce chaw ua haujlwm cov tsev thiab cov chaw loj, hloov cov pob zeb ua ke, txo qhov ntev ntawm pawg thiab kev tsim kho.
2. Cov choj thiab kev thauj mus los pawg hauv paus: Choj piers ntawm hla- dej thiab hla- hiav txwv txuas hniav, siab - arched railway viaducts. tuab- cov kav dej LSAW phab ntsa tuaj yeem tiv taus cov khoom hnyav thiab khoov lub sijhawm, haum rau cov dej tob thiab cov av mos.
3. Marine thiab cua zog engineering:Ib pawg hauv paus rau sab ntug dej hiav txwv cua, piers rau docks, hla - hiav txwv cofferdams. Nws yuav tsum tau xav txog kev muaj peev xwm ntsug thiab dej hiav txwv corrosion, yoj cuam tshuam loads, thiab yog cov txheej txheem nyiam rau cov kav dej hauv hiav txwv.
4. Municipal thiab kev txhawb nqa engineering:Lub hauv paus pab txhawb nqa pawg, tiv thaiv- pawg ntab, steel casing rau cam khwb cia-hauv- qhov chaw pawg. ERW cov kav dej feem ntau yog siv rau qhov ntiav ntiav thiab kev txhawb nqa ib ntus, thaum LSAW cov kav dej yog siv rau cov qauv ruaj khov hauv qhov tob tob.

Muaj ob hom kev thov hauv qhov project:

1. Xaus -cov kabmob / sib txhuam steel pawg:Cov yeeb nkab steel yog ncaj qha mus rau hauv cov av txheej, cia siab rau qhov kawg tsis kam thiab sab kev sib txhuam ntawm cov pawg los nqa lub nra. Lawv tuaj yeem ua tiav nrog cov pob zeb sab hauv los txhim kho cov kabmob muaj peev xwm ntxiv;
2. Grouting pawg casing:Cov yeeb nkab steel ua haujlwm ua cov phab ntsa tiv thaiv ib ntus lossis ruaj khov. Internal drilling yog nqa tawm thiab pob zeb yog nchuav los tiv thaiv lub qhov tawg, thiab lawv tsim nyog rau xoob thiab dej - nplua nuj av txheej.

3.1 Kauv Seam Submerged Arc Welded Steel Yeeb Nkab (LSAW) - JCOE Txheej Txheem (Cov Txheej Txheem Tseem Ceeb rau Loj -Diameter Thick-Walled Piles)

Cov txheej txheem JCOE yog cov txheej txheem feem ntau siv los ua cov tuab- cov kav dej uas muaj cov kav dej uas siv los ua cov piling. Ib daim ntawv hlau yog nias- ua ib kauj ruam, haum rau txhua qhov tshwj xeeb ntawm cov kav dej nrog phab ntsa tuab ntawm 12 txog 80 hli thiab txoj kab uas hla ntawm 400 txog 3200 hli. Tag nrho cov txheej txheem muaj 16 cov txheej txheem tseem ceeb:

1. Raw khoom tshuaj xyuas ntawm lub Hoobkas:

Cov ntaub ntawv raw siv yog kub-kov tswj- dov thiab tswj- txias (TMCP) steel daim hlau, nrog rau cov ntaub ntawv tseem ceeb yog Q355B/C/D, Q390, S355JR, thiab lwm yam. low- alloy high- steels. Ua ntej nkag mus rau hauv lub Hoobkas, 100% kev kuaj ultrasonic yog ua los xyuas cov txheej txheem sab hauv thiab slag tsis xws luag hauv cov hlau phaj. Nyob rau tib lub sijhawm, cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, thiab qhov sib txawv ntawm qhov sib txawv tau txheeb xyuas.

2. Ntug milling ua:

Cov npoo ntawm cov hlau phaj yog precisely milled siv lub tshuab milling los kho qhov dav sib txawv. Nyob rau tib lub sijhawm, welding grooves (feem ntau X-zoo li tus lossis V-zoo li tus) tau ua tiav los xyuas kom meej qhov nkag thiab vuam seam tsim zoo rau kev vuam tom ntej.

3. Ntug ua ntej-bending:

Cov npoo ntawm cov hlau phaj yog ua ntej- khoov mus rau lub hom phiaj curvature siv cov menyuam los yog pwm ua ntej-bending tshuab kom tsis txhob "pear- zoo li lub taub hau" qhov tsis xws luag hauv cov yeeb nkab lub cev tom qab tsim thiab xyuas kom meej tias thaj chaw weld seam muaj qhov tsim nyog roundness, txo qhov kev sib sau rov qab.

4. JCO kauj ruam-los ntawm- kauj ruam forming:
(Cov hlau phaj nkag mus rau lub tshuab xovxwm gantry thiab maj mam tsim hauv peb kauj ruam)

- Thawj kauj ruam nias ib sab ntawm steel phaj rau hauv J hom;

- Cov kauj ruam thib ob nias rau sab nraud rau hauv C zoo sib xws;

- Thaum kawg, cov seams tau koom los ua ib qho qhib O- zoo li tus yeeb nkab billet.Cov txheej txheem no hloov tau yooj yim thiab tuaj yeem hloov cov kev qhia tshwj xeeb, hloov mus rau ntau -batch thiab me -batch customized txiav txim rau pawg hauv paus.

5. Ua ntej-welding positioning

Gas hlau arc vuam (GMAW) yog siv los ua qhov chaw txuas txuas ntxiv ntawm qhov sib txuas ntawm cov yeeb nkab qhib kom kho nws, kom ntseeg tau qhov sib txawv ntawm cov yeeb nkab steel thiab qhov sib txawv ntawm qhov sib txawv, thiab tiv thaiv qhov tsis zoo thiab kub hnyiab - los ntawm lub sij hawm lub ntsiab vuam.

6. Ob chav -sab submerged arc lub ntsiab vuam

Qhov no yog cov txheej txheem tseem ceeb uas txiav txim siab lub zog vuam. Nws txais kev vuam sab hauv + sab nraud vuam dual- txoj hauj lwm ntau- hlau submerged arc vuam txheej txheem:

- Internal welding feem ntau yog 4-xaim series submerged arc vuam, thiab sab nraud vuam yog 3-xaim tib yam. Qhov vuam ceev yog 1.2-1.8m / min, thiab cov cua sov tawm tswv yim yog tswj hwm ntawm 18-25kJ / cm;

- The welding agent covers the arc to isolate the air, ensuring uniform weld penetration depth and dense structure, and the final weld tensile strength is not lower than the base material itself.

7. Thawj puag ncig uas tsis yog - kev sim ua kom puas tsuaj

100% ultrasonic kuaj (UT) + X-ray industrial TV tshuaj xyuas yog ua tam sim ntawd tom qab vuam los xyuas cov kev puas tsuaj sab hauv xws li pores, slag inclusions, tsis tiav fusion, thiab incomplete penetration. Cov yeeb nkab tsis tsim nyog tau raug kho ncaj qha lossis muab pov tseg.

8. Mechanical expansion

Tag nrho cov yeeb nkab steel yog mechanically nthuav dav thoob plaws hauv nws qhov ntev, uas yog cov txheej txheem tseem ceeb uas paub qhov txawv ntawm LSAW pawg kav los ntawm lwm cov welded kav:

- Lub taub hau nthuav dav radially nthuav cov yeeb nkab lub cev, nrog rau qhov deformation feem ntau yog 0.8%-1.5%;

- Lub hom phiaj yog txhawm rau tshem tawm cov kev ntxhov siab uas nyob hauv vuam, sib npaug ntawm cov yeeb nkab lub cev kev ntxhov siab, thiab txhim kho qhov tseeb qhov tseeb. Lub ellipticity sib txawv tuaj yeem tswj tau nyob rau hauv ± 1.5mm, kom ntseeg tau tias coaxiality thaum pawg tsav tsheb sib txuas.

9. Hydraulic xeem

Kev ntsuas dej zoo li qub yog ua rau txhua lub kav dej, nrog rau kev ntsuas siab raws li cov qauv thiab cov qauv tsim. Lub sij hawm tuav lub sij hawm tsis pub tsawg tshaj 10 vib nas this los xyuas kom meej tag nrho cov sealing kev ua tau zoo thiab siab - bearing muaj peev xwm ntawm cov yeeb nkab lub cev. Cov cuab yeej cia li kaw qhov nkhaus nkhaus thiab khaws nws.

10. Cov yeeb nkab kawg ua tiav thiab kev soj ntsuam zaum kawg

Cov yeeb nkab kawg yog chamfered thiab flattened rau txheem vuam grooves ua. Tom qab ntawd, qhov thib ob ntawm ultrasonic + X-ray re- kev tshuaj xyuas tiav, ua ke nrog cov yeeb nkab kawg sib nqus particle kuaj, txhawm rau txheeb xyuas qhov tsis xws luag uas yuav tshwm sim hauv cov txheej txheem nthuav dav thiab dej siab.

11. Kev tiv thaiv corrosion thiab tiav cov khoom xa tuaj

Kev tiv thaiv corrosion yog ua raws li engineering xav tau (ib yam li epoxy, 3PE hnyav-lub luag haujlwm tiv thaiv corrosion, marine engineering corrosion txheej), thiab tom qab ntawd cov yeeb nkab raug cim, ntsuas, thiab daim ntawv pov thawj zoo yog muab ua ntej xa khoom.

3.2 Nruam txoj kev tsim rau Ncaj Seam Siab Zaus Resistance Welded Steel Pipes (ERW / HFW)

Cov txheej txheem no feem ntau yog siv rau me me thiab nruab nrab - qhov loj ntawm txoj kab uas hla ntawm cov yeeb nkab siv nrog aTxoj kab uas hla tsawg dua lossis sib npaug li 600mm thiab phab ntsa thickness tsawg dua lossis sib npaug li 16mm. Nws siv kub- dov steel strips raws li cov ntaub ntawv raw thiab yog tsim tas li, muaj kev ua haujlwm siab thiab tus nqi qis:

1. Tom qab cov hlau sawb tsis raug mob, ncaj, thiab ntug- txiav, nws txuas ntxiv dov mus rau hauv ib puag ncig yeeb nkab billet los ntawm ntau pawg ntawm cov menyuam;
2. Siv cov nyhuv ntawm daim tawv nqaij ntawm qhov siab - zaus induction tam sim no, ntug ntawm cov yeeb nkab billet yog tam sim ntawd rhuab mus rau lub xeev molten, thiab cov khoom-theem vuam yog ua tiav los ntawm lub siab ntawm extrusion rollers yam tsis muaj cov hlau muab tub lim;
3. Cov burrs nyob rau sab hauv thiab sab nrauv weld seams yog scraped tawm hauv internet, thiab cov weld seams undergo nruab nrab - zaus kub tempering rau nruab nrab- zaus cua sov kho kom zoo cov nplej thiab tshem tawm cov nkig vuam qauv;
4. Cov yeeb nkab tau ncaj thiab kho raws li txoj kab uas hla, txiav mus rau qhov ntev ntev los ntawm kev ya dav hlau, dhau los ntawm kev ntsuas dej siab thiab kev tshuaj xyuas tam sim no, thiab tom qab ntawd muab khaws cia rau hauv lub warehouse.

Piv nrog rau kauv seam welded kav thiab seamless steel yeeb nkab pawg, cov tsav ncaj seam steel yeeb nkab (tshwj xeeb tshaj yogLSAW txheej txheem) muaj irreplaceable technical zoo:

1. High weld kev ntseeg tau
Qhov ntev ntawm qhov ncaj seam weld yog luv dua li ntawm tib lub ntsiab lus kauv seam kav, thiab tag nrho qhov tshwm sim ntawm vuam tsis xws luag yog qis dua; lub weld yog faib longitudinally raws cov yeeb nkab lub cev, uas muab lub xeev kev ntxhov siab zoo dua thaum lub hauv paus pawg yog raug rau axial compression thiab dabtsi yog khoov, tsis muaj shear stress superposition nyhuv ntawm kauv welds, thiab muaj kev tiv thaiv zoo rau hammering.

2. Zoo heev qhov tseeb thiab roundness
Tom qab kev nthuav dav ntawm LSAW cov kav dej, qhov sib txawv ntawm sab nraud, ellipticity, thiab qhov ncaj yog qhov zoo dua li cov kav dej kauv welded. Qhov sib koom ua ke misalignment ntawm cov yeeb nkab kawg yog me me, thiab ntawm -site pawg kev sib txuas kev tsim kho efficiency siab. Thaum lub sij hawm cov txheej txheem tsav tsheb, pawg lub cev tsis tshua yuav khoov vim tsis zoo coaxiality.

3. Cov tuab -cov qauv phab ntsa yog sib xws nrog siab -lub zog steel.
Nws tuaj yeem tsim tau siab -lub zog tuab- cov kav dej uas muaj phab ntsa tuab tshaj 80mm thiab qib steel ntawm S460ML / X80. Cov kav dej no tsim nyog rau cov xwm txheej uas hnyav hnyav xws li ultra- cov hauv paus sib sib zog nqus pawg thiab marine engineering. Qhov no yog ib yam dab tsi uas ERW kav, kauv kav, thiab feem ntau seamless kav tsis tuaj yeem ua tiav.

4. Tsawg residual kev nyuaj siab, zoo heev qaug zogresikev taw qhia
Cov txheej txheem nthuav dav tuaj yeem tshem tawm ntau dua 80% ntawm cov welding residual stress. Qhov kev ntxhov siab ntawm cov yeeb nkab lub cev tsis sib xws, thiab nws muaj zog tiv thaiv - qaug zog tawg muaj peev xwm nyob rau hauv ntev - lub sij hawm dynamic loading thiab reciprocating loads. Nws yog tsim rau dynamic load pawg hauv paus xws li txuas hniav thiab cua zog.

5. Tus nqi tag nrho -effectiveness
Nyob rau hauv tib lub load-cov kabmob muaj peev xwm, tus nqi yog 30% mus rau 50% qis dua li ntawm seamless steel kav; nyob rau hauv tib lub specifications, nws cov kev ua tau zoo yog superior rau kauv seam kav, tsuas yog ib tug me ntsis dua nqi tsev. Hauv cov phiaj xwm siab - kawg pawg, nws cov txiaj ntsig tag nrho yog qhov zoo tshaj plaws.

Cov pawg-tsav ncaj seam steel yeeb nkab muaj kev lag luam meej thiab cov qauv hauv tebchaws. Qhov tseem ceeb tswj qhov ntev yog raws li nram no:

4.1 Mainstream Execution Standards

• Domestic General Standard: SY/T 5040-2012 "Welded Steel Pipes for Piles", npog kev tsim kho, kev tsim vaj tsev hauv nroog, thiab cov kav dej zoo tib yam;
• Tshwj xeeb rau Marine Engineering: GB/T 37636-2019 "Welded Steel Pipes for Marine Engineering Piles", nrog rau kev xav tau ntau dua rau kev sib tw, qis- kub toughness, thiab tiv thaiv corrosion;
• International General Standard:ASTM A252 / A252M "Specification rau Welded thiab Seamless Steel Pipes", dav siv hauv cov haujlwm xa tawm.

4.2 Cov Ntsiab Lus Yuav Tsum Tau Ua

1. Raw Materials thiab Chemical Composition
Cov ntaub ntawv raw yog kub- dov steel phaj/steel strips. Cov hom hlau feem ntau yog carbon steel qauv (Q235B), qis- alloy siab- lub zog steel qauv (Q355, Q390, S355 series). Cov tshuaj muaj pes tsawg leeg yuav tsum ua raws li cov qauv ntawm cov khoom siv hauv paus. Cov ntsiab lus ntawm cov khoom tsis zoo xws li phosphorus thiab sulfur yuav tsum tau tswj xyuas nruj kom ntseeg tau tias qis{10}}kub toughness thiab weldability.

2. Dimension thiab cov duab raug

• Sab nraud txoj kab sib txawv: Feem ntau Tsawg dua los yog sib npaug rau ± 0.5% ntawm nominal txheej kab. Rau cov pawg sab nrauv, qhov yuav tsum tau muaj tsawg dua lossis sib npaug rau ± 0.3%.
• Phab ntsa thickness sib txawv: Rau cov pawg zoo tib yam, Tsawg dua los yog sib npaug rau ± 12.5% ​​ntawm nominal phab ntsa thickness. Rau cov tuab- cov phab ntsa, qhov sib txawv tuaj yeem nruj raws li qhov kev pom zoo.
• Ellipticity: Rau cov pawg zoo tib yam, Tsawg dua lossis sib npaug li 1% ntawm txoj kab uas hla. Rau offshore engineering pawg, kev tswj qhov tseeb yog 20% ​​siab dua li cov qauv siv.
• Kev Ncaj Ncees: Tsawg dua lossis sib npaug li 0.1% ntawm cov yeeb nkab ntev, ua kom ntseeg tau qhov ntsug ntawm pawg tsav tsheb.

3. Mechanical Performance Requirements

• Lub transverse tensile zog ntawm cov yeeb nkab lub cev (yield zog, tensile zog, elongation tom qab tawg) yuav tsum ua raws li cov qauv ntawm cov khoom siv hauv paus;
• Lub zog tensile ntawm lub welded sib koom yuav tsum siab tshaj los yog sib npaug rau qhov tsawg kawg nkaus tus nqi teev nyob rau hauv lub hauv paus cov ntaub ntawv tus qauv thiab yuav tsum tsis txhob yuav tsawg tshaj li lub hauv paus khoom;
• Rau qis- qhov kub thiab txias ib puag ncig thiab marine engineering, Charpy impact test yuav tsum tau ua los xyuas kom meej qhov cuam tshuam toughness ntawm -20℃/-40℃;
• ERW steel kav yuav tsum tau ua ib qho kev sim flattening los xyuas qhov kev sib txuas ntawm cov yas thiab lub zog sib txuas.

4. Tsis yog -Kev Ntsuas Kev Ntsuas thiab Kev Tswj Xyuas Zoo

• 100% ultrasonic kuaj thiab X-ray tshuaj xyuas yog ua rau weld seams; Qib txais tsis raug yog ua raws li cov qauv;
• Kev ntsuam xyuas cov khoom sib nqus yuav tsum tau ua ntawm cov yeeb nkab kawg kom pom qhov chaw qhib qhov tsis xws luag thiab tiv thaiv kev tawg ntawm cov yeeb nkab kawg thaum piling;
• Cov kev ntsuas dej sib txuas yog qhov yuav tsum tau soj ntsuam cov khoom thaum lub Hoobkas xa khoom; tsis muaj dej thiab tsis muaj yas deformation yog suav tias yog tsim nyog.

5. Kev Tsim Kho Tshwj Xeeb Ntxiv Kev Xav Tau

• Oceanic Pile Foundations: Cov kev xav tau ntxiv muaj xws li kev txhim kho kev tiv thaiv- kev ua haujlwm corrosion, tiv thaiv txheej tearing (Z- kev taw qhia kev ua haujlwm), thiab kev tiv thaiv dej hiav txwv cuam tshuam corrosion;
• Hammering Pile Tsav: Lub hardness ntawm pawg taub thiab cuam tshuam toughness yuav tsum tau txhim kho. Qee zaum, pawg khau khiab thiab pawg kaus mom yuav tsum tau ntxiv rau kev txhawb nqa;
• Cov Pleev Cov Txheej Txheem Txuas Ntxiv: Cov kev xav tau ntxiv suav nrog kev ua kom qaug zog ntxiv thiab weld seam toughness margin. Rau qee qhov haujlwm, kev ntsuas txheej txheem vuam (WPS) yuav tsum tau ua.