Ncaj seam steel yeeb nkab yog cov yeeb nkab steel nrog lub welded seam uas yog sib npaug mus rau qhov ntev ntawm cov yeeb nkab steel. Feem ntau muab faib ua metric hluav taws xob welded steel kav, hluav taws xob welded nyias-walled kav, transformer txias roj kav, thiab lwm yam. Cov txheej txheem ntau lawm Ncaj seam high-frequency welded steel kav muaj cov yam ntxwv ntawm cov txheej txheem yooj yim thiab ceev nruam ntau lawm. Lawv tau siv dav hauv kev tsim kho pej xeem, petrochemical, lub teeb kev lag luam, thiab lwm yam haujlwm. Nws feem ntau yog siv los thauj cov kua dej uas tsis tshua muaj siab lossis ua rau ntau yam engineering thiab cov khoom lag luam teeb.cov

1. Cov txheej txheem ntau lawm ntws ncaj seam siab zaus welded steel yeeb nkab

Ncaj seam welded steel yeeb nkab yog tsim los ntawm dov ib tug ntev sawb ntawm ib tug tej yam specification rau hauv ib puag ncig raj zoo los ntawm ib tug high-frequency welding tsev thiab ces welding ncaj seam los tsim ib tug steel yeeb nkab. Cov duab ntawm cov yeeb nkab steel tuaj yeem yog puag ncig, square, lossis tshwj xeeb-puab, uas nyob ntawm qhov loj thiab dov tom qab vuam. Cov ntaub ntawv tseem ceeb ntawm welded steel kav yog cov pa roj carbon tsawg thiab cov hlau tsis tshua muaj hlau lossis lwm cov ntaub ntawv hlau nrogσs≤300 N / mm2, thiabσs≤500N / hli 2.cov

2. High-frequency vuam

High-frequency welding yog raws li lub hauv paus ntsiab lus ntawm electromagnetic induction thiab cov nyhuv ntawm daim tawv nqaij, cov nyhuv sib thooj, thiab eddy tam sim no thermal nyhuv ntawm AC nqi nyob rau hauv tus neeg xyuas pib kom cov hlau ntawm ntug ntawm lub weld nyob rau hauv lub zos rhuab mus rau lub molten lub xeev. Tom qab extruded los ntawm cov menyuam, lub pob tw weld yog inter-crystalline. Ua ke kom ua tiav lub hom phiaj ntawm vuam. High-frequency welding yog ib hom induction welding (los yog siab tiv thaiv vuam). Nws tsis xav tau cov khoom siv welding, tsis muaj vuam spatter, muaj qhov nqaim vuam tshav kub-tshem cov cheeb tsam, zoo nkauj vuam duab, thiab zoo welding mechanical zog. Yog li ntawd, nws yog nyiam nyob rau hauv zus tau tej cov steel kav. Kev siv dav dav.cov

High-frequency welding ntawm steel kav siv cov nyhuv ntawm daim tawv nqaij thiab cov nyhuv sib thooj ntawm alternating tam sim no. Tom qab cov hlau (strips) yog dov thiab tsim, ib lub voj voos kheej kheej nrog ib qho tawg yog tsim, uas yog rotated nyob rau hauv lub raj nyob ze ntawm qhov chaw ntawm induction kauj. Los yog ib txheej ntawm resistors (magnetic rods). Lub resistor thiab qhib lub raj dawb paug tsim ib lub voj voog electromagnetic induction. Nyob rau hauv qhov kev txiav txim ntawm cov nyhuv ntawm daim tawv nqaij thiab cov nyhuv sib thooj, lub ntug ntawm lub raj dawb paug qhib ua ib tug muaj zog thiab concentrated thermal nyhuv, ua rau lub ntug ntawm lub weld Tom qab tau kub sai heev rau qhov kub thiab txias yuav tsum tau rau vuam thiab extruded los ntawm ib tug siab roller, molten hlau ua tiav inter-granular bonding thiab tsim cov pob tw muaj zog tom qab txias.

3. High-frequency welded yeeb nkab chav tsev

Cov txheej txheem vuam ntau zaus ntawm cov kav hlau ncaj seam yog ua tiav nyob rau hauv high-frequency welded yeeb nkab units. High-frequency welded yeeb nkab units feem ntau muaj yob txoj kev, high-frequency vuam, extrusion, txias, sizing, ya saw txiav, thiab lwm yam khoom. Sab pem hauv ntej kawg ntawm chav tsev yog nruab nrog lub voj voog cia, thiab tom qab kawg ntawm chav tsev yog nruab nrog steel yeeb nkab tig ncej; Cov hluav taws xob feem ntau yog muaj lub tshuab hluav taws xob siab, DC excitation generator, thiab cov cuab yeej tswj tsis siv neeg.

4. High-frequency excitation Circuit Court

Lub high-frequency excitation Circuit Court (tseem hu ua high-frequency oscillation circuit) yog tsim los ntawm ib tug loj electron raj thiab ib tug oscillation tank ntsia nyob rau hauv lub high-frequency generator. Nws siv cov nyhuv amplification ntawm lub raj electron. Thaum lub raj hluav taws xob txuas nrog lub filament thiab anode, lub anode yog cov teeb liab tso tawm tau zoo rov qab mus rau lub rooj vag, ua rau nws tus kheej zoo siab oscillation voj. Qhov loj ntawm qhov excitation zaus nyob ntawm qhov ntsuas hluav taws xob (voltage, tam sim no, capacitance, thiab inductance) ntawm oscillation tank.cov

5. Ncaj seam steel yeeb nkab high-frequency vuam txheej txheem

5.1 Tswj qhov sib txawv ntawm qhov sib txawv

Lub sawb hlau yog pub rau hauv cov yeeb nkab welded. Tom qab tau dov los ntawm ntau lub chais, cov sawb hlau yog maj mam dov los ua ib lub voj voos kheej kheej nrog qhov qhib qhov sib txawv. Kho qhov txo qis ntawm cov menyuam extrusion los tswj qhov sib txawv ntawm qhov sib txawv ntawm 1 thiab 3 hli. Thiab ua ob qhov kawg ntawm qhov chaw nres nkoj vuam. Yog tias qhov sib txawv loj dhau lawm, qhov sib thooj ntawm qhov sib thooj yuav raug txo, qhov eddy tam sim no kub yuav tsis txaus, thiab inter-crystal bonding ntawm weld yuav tsis zoo, ua rau tsis muaj fusion lossis tawg. Yog tias qhov sib txawv me me dhau lawm, qhov sib thooj ntawm qhov sib thooj yuav nce thiab qhov vuam kub yuav siab dhau, ua rau cov vuam kub hnyiab; los yog cov weld yuav tsim ib lub qhov tob tom qab extruded thiab dov, cuam tshuam rau qhov zoo ntawm cov weld.cov

5.2 Welding kub tswj

Lub vuam kub yog feem ntau cuam tshuam los ntawm high-frequency eddy tam sim no thermal zog. Raws li cov qauv (2), nws tuaj yeem pom tau tias qhov hluav taws xob muaj zog eddy tam sim no thermal zog feem ntau cuam tshuam los ntawm qhov zaus tam sim no. Lub eddy tam sim no thermal hwj chim yog proportional rau lub square ntawm lub tam sim no excitation zaus, thiab tam sim no excitation zaus yog nyob rau hauv lem cuam tshuam los ntawm excitation zaus. Qhov cuam tshuam ntawm voltage, tam sim no, capacitance, thiab inductance. Tus qauv excitation zaus yog f = 1 / [2π(CL)1/2]…(1) Qhov twg: f-excitation zaus (Hz); C-capacitance (F) nyob rau hauv lub voj excitation, capacitance = hwj chim / Voltage; L-inductance nyob rau hauv lub voj excitation, inductance = magnetic flux / tam sim no. Nws tuaj yeem pom los ntawm cov qauv saum toj no tias qhov excitation zaus yog inversely proportional rau lub hauv paus square ntawm capacitance thiab inductance nyob rau hauv lub voj excitation, los yog ncaj qha proportional rau lub square root ntawm voltage thiab tam sim no. Tsuav qhov capacitance thiab inductance nyob rau hauv lub voj raug hloov, qhov inductive voltage lossis tam sim no tuaj yeem hloov qhov excitation zaus, yog li ua tiav lub hom phiaj ntawm kev tswj cov vuam kub. Rau cov pa roj carbon tsawg, qhov vuam kub yog tswj ntawm 1250 ~ 1460℃, uas tuaj yeem ua tau raws li qhov xav tau ntawm vuam nkag ntawm 3 ~ 5mm yeeb nkab phab ntsa tuab. Tsis tas li ntawd, qhov vuam kub kuj tuaj yeem ua tiav los ntawm kev kho qhov vuam ceev. Thaum lub tshav kub input tsis txaus, lub rhuab weld ntug tsis tuaj yeem ncav cuag qhov kub thiab txias, thiab cov qauv hlau tseem ruaj khov, ua rau tsis tiav fusion lossis vuam tsis tiav; Thaum cov khoom siv hluav taws xob tsis txaus, qhov welded ntug rhuab tshaj qhov vuam kub, uas ua rau kub kub los yog molten droplets yuav ua rau lub weld tsim ib lub qhov molten.cov

5.3 Tswj lub zog extrusion

Tom qab ob lub npoo ntawm lub raj tsis muaj rhuab mus rau qhov kub thiab txias, lawv tau nyem los ntawm cov hlua khi los ua cov hlau nplej uas nkag mus thiab crystallize nrog ib leeg, nws thiaj li tsim tau ib qho chaw muaj zog. Yog hais tias lub extrusion quab yuam me me dhau lawm, tus naj npawb ntawm cov khoom siv lead ua yuav me me, lub zog ntawm cov hlau vuam yuav txo qis, thiab tawg yuav tshwm sim tom qab kev ntxhov siab; Yog hais tias lub extrusion quab yuam loj dhau lawm, cov hlau molten yuav raug nyem tawm ntawm lub vuam, uas yuav tsis tsuas yog txo lub zog ntawm cov weld, thiab ib tug loj tus naj npawb ntawm sab hauv thiab sab nrauv burrs yuav raug tsim, txawm yuav ua rau tsis xws luag xws li welding lap seams.cov

5.4 Tswj ntawm high-frequency induction coil txoj hauj lwm

Lub high-frequency induction coil yuav tsum nyob ze li sai tau rau txoj hauj lwm ntawm lub tshuab nyem. Yog hais tias lub induction coil nyob deb ntawm lub extrusion roller, lub sij hawm ua kom sov zoo yuav ntev dua, qhov chaw uas muaj cua sov yuav dav dua, thiab lub zog ntawm cov vuam yuav txo qis; ntawm qhov tsis sib xws, ntug ntawm qhov vuam yuav tsis raug cua sov txaus thiab cov duab yuav tsis zoo tom qab extrusion.cov

5.5 Lub resistor yog ib los yog ib pab pawg neeg tshwj xeeb sib nqus rods rau welded kav. Qhov chaw hla ntu ntawm cov resistor feem ntau yuav tsum tsis pub tsawg tshaj 70% ntawm qhov chaw hla ntawm lub puab kab ntawm cov yeeb nkab steel. Nws txoj haujlwm yog tsim lub voj voog electromagnetic induction nrog lub induction kauj, ntug ntawm cov yeeb nkab tsis muaj vuam seam, thiab cov pas nrig sib nqus. , ua kom muaj kev sib thooj, cov eddy tam sim no kub yog concentrated nyob ze ntawm ntug ntawm lub raj dawb paug weld, ua rau lub ntug ntawm lub raj dawb paug yuav tsum rhuab mus rau lub vuam kub. Lub resistor yog rub rau hauv lub raj tsis muaj steel hlau, thiab nws txoj hauj lwm hauv nruab nrab yuav tsum tau kho nyob ze rau qhov chaw ntawm cov menyuam extrusion. Thaum lub tshuab qhib, vim qhov ceev ceev ntawm lub raj tsis muaj zog, lub resistor raug kev puas tsuaj loj los ntawm kev sib txhuam ntawm sab hauv phab ntsa ntawm lub raj khoob thiab yuav tsum tau hloov ntau zaus.cov

5.6 Tom qab vuam thiab extrusion, vuam caws pliav yuav raug tsim thiab yuav tsum tau muab tshem tawm. Txoj kev ntxuav yog kho cov cuab yeej ntawm tus ncej thiab tso siab rau kev txav ceev ntawm cov yeeb nkab welded kom du lub vuam caws pliav. Burrs hauv welded kav feem ntau tsis raug tshem tawm.cov

6. Kev xav tau thiab kev tshuaj xyuas zoo ntawm cov kav dej ntau zaus

Raws li GB3092 "Welded Steel Pipe rau Tsawg-Pressure Fluid Transport" tus qauv, lub nominal txoj kab uas hla ntawm welded yeeb nkab yog 6 ~ 150mm, lub nominal phab ntsa thickness yog 2.0 ~ 6.0 hli, qhov ntev ntawm cov yeeb nkab welded feem ntau yog 4 ~ 10. meters thiab tuaj yeem teev nyob rau hauv qhov ntev ntev lossis ntau qhov ntev Hoobkas. Qhov zoo ntawm cov yeeb nkab steel yuav tsum du, thiab qhov tsis xws luag xws li folding, tawg, delamination, thiab lap welding tsis raug tso cai. Qhov saum npoo ntawm cov yeeb nkab steel tau tso cai kom muaj qhov tsis xws luag xws li khawb, khawb, vuam dislocations, kub hnyiab, thiab nti uas tsis pub dhau qhov tsis zoo sib txawv ntawm phab ntsa tuab. Thickening ntawm phab ntsa thickness ntawm lub weld thiab muaj nyob rau hauv lub weld tuav yog tso cai. Welded steel kav yuav tsum tau ua raws li kev ntsuas kev ua tau zoo, kev ntsuas kev sib tw, thiab kev nthuav dav, thiab yuav tsum ua kom tau raws li qhov yuav tsum tau teev tseg hauv tus qauv. Cov yeeb nkab steel yuav tsum muaj peev xwm tiv taus qee qhov siab sab hauv. Yog tias tsim nyog, kev ntsuas siab 2.5Mpa yuav tsum tau ua kom tsis txhob xau rau ib feeb. Nws raug tso cai siv eddy tam sim no flaw nrhiav kom tau txoj kev es tsis txhob ntawm cov hydrostatic test. Eddy tam sim no tsis pom kev yog ua los ntawm tus qauv GB7735 "Eddy Tam sim no Flaw Detection Inspection Method for Steel Pipes". Txoj kev tshawb nrhiav qhov tsis txaus ntseeg tam sim no yog txhawm rau txhim kho qhov kev sojntsuam ntawm tus ncej, khaws qhov deb ntawm 3 ~ 5 hli ntawm qhov kev kuaj pom qhov tsis zoo thiab qhov vuam, thiab tso siab rau kev txav ceev ntawm cov yeeb nkab steel los ua qhov kev soj ntsuam ntawm cov vuam. Lub teeb pom kev tsis txaus ntseeg tau ua tiav thiab txiav txim siab los ntawm eddy tam sim no flaw detector. Yuav kom ua tiav lub hom phiaj ntawm qhov tsis pom kev. Nws yog cov yeeb nkab steel uas ua los ntawm cov hlau phaj lossis cov hlua hlau uas yog curled thiab ces welded. Cov txheej txheem ntau lawm ntawm welded steel kav yog yooj yim, ntau lawm efficiency yog siab, muaj ntau ntau yam thiab specifications, thiab cov cuab yeej siv peev me me, tab sis lub zog dav dav yog qis dua li seamless steel kav. Txij li thaum xyoo 1930s, nrog rau kev txhim kho sai ntawm kev sib txuas ua ke ntawm cov hlau zoo thiab kev nce qib ntawm vuam thiab tshuaj xyuas tshuab, qhov zoo ntawm welds tau txuas ntxiv txhim kho, thiab ntau yam thiab cov ntsiab lus ntawm cov kav hlau welded tau nce ib hnub. , hloov cov kav hlau tsis tiav hauv ntau qhov chaw. Sewing steel yeeb nkab. Welded steel kav yog muab faib ua ncaj seam welded kav thiab kauv welded kav raws li daim ntawv ntawm weld. Cov txheej txheem ntau lawm ntawm txoj kab ncaj nraim welded yeeb nkab yog qhov yooj yim, qhov kev ua tau zoo yog siab, tus nqi qis, thiab kev loj hlob sai. Lub zog ntawm kauv welded kav feem ntau yog siab tshaj qhov ncaj seam welded kav. Welded kav nrog loj diameters yuav ua tau los ntawm cov nqaim billets, thiab welded kav nrog txawv diameters kuj yuav ua tau los ntawm billets ntawm tib lub dav. Txawm li cas los xij, piv nrog cov kav dej ncaj nraim ntawm tib qhov ntev, qhov ntev ntawm qhov vuam yog nce los ntawm 30 ~ 100%, thiab qhov ceev ntau lawm yog qis dua. Tom qab kuaj pom qhov tsis zoo, cov yeeb nkab welded raug txiav mus rau qhov ntev ntev nrog lub dav hlau pom thiab tau dov tawm ntawm cov kab ntau lawm ntawm lub flip ncej. Ob qhov kawg ntawm cov yeeb nkab steel yuav tsum yog tiaj-chamfered thiab cim, thiab cov kav dej tiav yuav tsum tau ntim rau hauv hexagonal bundles ua ntej tawm hauv lub Hoobkas.