Nyob rau hauv kev tsim cov hlab ntsha siab, thaum submerged arc welding yog siv los welding longitudinal weld ntawm lub tog raj kheej, cov kab nrib pleb feem ntau tshwm sim ntawm los yog ze rau qhov kawg ntawm cov longitudinal weld (tom qab no hu ua cov kab nrib pleb).
Ntau tus neeg tau kawm txog qhov no, thiab lawv xav tias lub ntsiab yog vim li cas rau qhov tawg ntawm lub davhlau ya nyob twg yog thaum lub vuam arc nyob ze rau qhov kawg ntawm qhov ntev ntawm qhov vuam, qhov vuam nthuav dav thiab deforms nyob rau hauv axial kev taw qhia, thiab yog nrog los ntawm transverse nro hauv. ntsug axial kev taw qhia. qhib deformation;
Nyob rau hauv cov txheej txheem ntawm dov, manufacturing thiab assembling, lub tog raj kheej kuj muaj txias ua hauj lwm hardening kev nyuaj siab thiab los ua ke kev nyuaj siab; Thaum lub sij hawm welding txheej txheem, vim qhov kev txwv ntawm qhov chaw nres tsheb vuam thiab lub arc ntaus phaj, ib tug loj stretch yog generated thaum kawg ntawm lub weld. kev ntxhov siab;
Thaum lub arc txav mus rau lub davhlau ya nyob twg qhov chaw vuam thiab lub arc ntaus phaj, vim yog thermal expansion thiab deformation ntawm qhov no, lub transverse tensile kev nyuaj siab nyob rau hauv qhov kawg ntawm lub weld yog so, thiab lub restraint quab yuam yog txo, thiaj li hais tias lub welding. hlau uas nyuam qhuav solidified ntawm qhov kawg ntawm lub vuam yog txo. Terminal tawg yog tsim vim muaj zog tensile loj.
Raws li kev txheeb xyuas saum toj no ntawm cov laj thawj, ob txoj kev daws teeb meem tau npaj tseg:
Ib qho yog nce qhov dav ntawm arc ntaus phaj kom nws txoj hlua khi;
Qhov thib ob yog siv lub slotted elastic restraint arc-pib phaj.
Txawm li cas los xij, tom qab siv cov kev ntsuas saum toj no hauv kev xyaum, qhov teeb meem tsis tau daws tau zoo:
Piv txwv li, txawm hais tias lub elastic retention arc ignition phaj yog siv, lub davhlau ya nyob twg tawg ntawm lub longitudinal weld yuav tseem generated, thiab lub davhlau ya nyob twg tawg feem ntau tshwm sim thaum lub vuam thickness me me, lub rigidity yog me me thiab lub tog raj kheej lub cev yog forcibly assembled;
Txawm li cas los xij, thaum muaj cov khoom kuaj phaj nyob rau hauv qhov txuas txuas ntawm qhov ntev ntawm lub tog raj kheej, txawm hais tias qhov xwm txheej ntawm tack welding yog tib yam li qhov tsis muaj cov khoom kuaj phaj, qhov ntev seam tsis tshua muaj tsim los tsim cov kab nrib pleb.
Tom qab rov kuaj thiab tshuaj xyuas, nws pom tau hais tias tiam ntawm longitudinal seam davhlau ya nyob twg tawg tsis yog tsuas yog cuam tshuam rau lub inevitable loj tensile kev nyuaj siab ntawm lub davhlau ya nyob twg weld, tab sis kuj muaj feem xyuam rau ob peb lwm yam tseem ceeb heev vim li cas.
Ib. Kev soj ntsuam ntawm qhov ua rau ntawm qhov tawg ntawm lub davhlau ya nyob twg
1. Kev hloov pauv ntawm qhov kub thiab txias ntawm lub davhlau ya nyob twg weld
Thaum lub sij hawm arc vuam, thaum lub vuam kub qhov chaw nyob ze rau qhov kawg ntawm qhov ntev ntawm qhov vuam, qhov kub ib txwm nyob rau qhov kawg ntawm qhov vuam yuav hloov, thiab qhov ze rau qhov kawg, qhov kev hloov pauv ntau dua.
Txij li qhov loj ntawm arc pilot phaj yog me dua li ntawm lub tog raj kheej, nws lub peev xwm kub kuj tseem me dua, thiab cov arc tsav phaj thiab lub tog raj kheej tsuas yog txuas nrog tack welding, yog li feem ntau ntawm lawv tuaj yeem suav tias yog tsis tu ncua.
Yog li ntawd, lub tshav kub hloov pauv ntawm lub davhlau ya nyob twg weld yog qhov tsis zoo, uas ua rau muaj qhov nce hauv qhov kub thiab txias ntawm qhov chaw, cov duab ntawm lub pas dej molten yuav hloov, qhov nkag mus tob yuav nce ntxiv, thiab lub sijhawm ntawm lub pas dej molten nyob. thaum kub kub kuj yuav ntev dua. Qhov ceev ntawm lub pas dej molten solidification qeeb, tshwj xeeb tshaj yog thaum qhov loj ntawm arc ignition phaj me dhau, thiab cov tack weld ntawm arc ignition phaj thiab lub tog raj kheej yog luv dhau los yog nyias.
2. Kev cuam tshuam ntawm vuam cua sov input
Txij li thaum vuam cov khoom siv hluav taws xob siv nyob rau hauv submerged arc vuam feem ntau loj dua li lwm txoj kev vuam, qhov nkag mus tob yog loj, cov nyiaj tso rau hlau yog loj, thiab nws yog them los ntawm ib txheej flux, yog li lub pas dej molten loj thiab ceev ntawm lub pas dej molten solidification. Thiab qhov txias txias ntawm cov vuam yog qeeb dua li lwm txoj kev vuam, ua rau cov nplej coarser thiab sib cais hnyav dua, uas tau tsim cov xwm txheej zoo heev rau cov txheej txheem kub kub.
Tsis tas li ntawd, lub lateral shrinkage ntawm vuam seam yog ntau me dua qhov qhib qhov sib txawv, yog li ntawd lub lateral tensile quab yuam ntawm lub davhlau ya nyob twg yog loj dua li ntawm lwm txoj kev vuam. Qhov no yog tshwj xeeb tshaj yog muaj tseeb rau beveled nruab nrab daim hlau thiab unbevelled thinner daim hlau.
3. Lwm yam xwm txheej
Yog tias muaj kev sib dhos yuam kev, kev sib dhos zoo tsis ua raws li qhov yuav tsum tau ua, thiab cov ntsiab lus ntawm impurities xws li S thiab P hauv lub hauv paus hlau yog siab dhau thiab kev sib cais, uas tseem yuav ua rau tawg.
Thib ob: Qhov xwm txheej ntawm cov kab nrib pleb
Terminal tawg yog cov tawg kub raws li lawv qhov xwm txheej, thiab cov kab nrib pleb kub tuaj yeem muab faib ua cov kab nrib pleb thiab cov kab nrib pleb raws li lawv cov theem tsim. Txawm hais tias qhov chaw ntawm lub davhlau ya nyob twg tawg yog qee zaum lub davhlau ya nyob twg, qee zaum nyob rau hauv 150mm los ntawm thaj chaw nyob ib ncig ntawm lub davhlau ya nyob twg, qee zaum nws yog qhov tawg, qee zaum nws yog qhov tawg sab hauv, thiab feem ntau yog cov kab nrib pleb nyob ib ncig ntawm lub davhlau ya nyob twg.
Nws tuaj yeem pom tau tias qhov xwm txheej ntawm lub davhlau ya nyob twg tawg yog qhov tseem ceeb ntawm cov khoom tawg, uas yog, thaum lub davhlau ya nyob twg tseem nyob hauv cov kua dej, txawm hais tias lub pas dej molten nyob ze ntawm lub davhlau ya nyob twg, nws tseem nyob ntawm qhov kub thiab txias. me ntsis hauv qab lub solidus. Nyob rau hauv lub xeev xoom-lub zog, cov kab nrib pleb yog tsim nyob rau hauv qhov kev txiav txim ntawm txoj kev vuam kev nyuaj siab (feem ntau tensile stress) ntawm lub davhlau ya nyob twg,
Cov txheej txheej saum npoo ntawm cov weld nyob ze ntawm qhov chaw yog yooj yim rau dissipate tshav kub, qhov kub thiab txias yog tsawg, thiab nws muaj ib tug tej yam lub zog thiab zoo heev plasticity, yog li ntawd lub davhlau ya nyob twg tawg feem ntau tshwm sim nyob rau hauv lub weld thiab tsis tuaj yeem kuaj pom ntawm qhov muag liab qab.
Peb. Kev ntsuas los tiv thaiv qhov tawg ntawm lub davhlau ya nyob twg
Los ntawm cov kev soj ntsuam saum toj no ntawm qhov ua rau ntawm qhov tawg ntawm lub davhlau ya nyob twg, nws tuaj yeem pom tau tias qhov tseem ceeb tshaj plaws kev ntsuas kom kov yeej cov kab nrib pleb ntawm submerged arc vuam longitudinal seams yog:
1. Ua kom qhov loj ntawm arc tsav phaj
Cov neeg feem ntau tsis paub txaus txog qhov tseem ceeb ntawm arc ntaus phaj, xav tias qhov kev ua haujlwm ntawm arc ntaus phaj tsuas yog coj cov arc crater thaum lub sij hawm arc kaw rau sab nraud ntawm qhov vuam. Yuav kom txuag tau hlau, qee qhov ua rau arc tsav phaj me me thiab dhau los ua "arc pilot phaj". Cov kev coj ua no yuam kev heev. Lub arc ignition phaj muaj plaub txoj haujlwm:
(1) Ua rau qhov tawg ntawm qhov vuam thaum lub sij hawm arc tawm tsam thiab lub arc crater thaum arc kaw rau sab nraud ntawm qhov vuam.
(2) Txhim kho qhov kev txwv ntawm lub davhlau ya nyob twg ntawm qhov ntev seam, thiab dais lub zog tensile loj tsim los ntawm lub davhlau ya nyob twg.
(3) Txhim kho qhov kub thiab txias ntawm lub davhlau ya nyob twg, uas yog qhov tsim nyog rau kev siv hluav taws xob thiab tsis ua rau qhov kub ntawm lub davhlau ya nyob twg siab dhau.
(4) Txhim kho qhov sib nqus sib nqus ntawm lub davhlau ya nyob twg thiab txo qhov degree ntawm magnetic deflection.
Yuav kom ua tiav plaub lub hom phiaj saum toj no, lub arc ntaus phaj yuav tsum muaj qhov loj txaus, thiab lub thickness yuav tsum zoo ib yam li cov vuam vuam. Qhov luaj li cas yuav tsum tau txiav txim los ntawm qhov loj ntawm lub vuam thiab lub thickness ntawm cov hlau phaj. Rau cov hlab ntsha dav dav, nws raug pom zoo tias qhov ntev thiab qhov dav yuav tsum tsis pub tsawg dua 140mm.
2. Ua tib zoo saib xyuas qhov sib dhos thiab tack vuam ntawm arc ignition phaj
Lub tack vuam ntawm lub arc tsav phaj thiab lub tog raj kheej yuav tsum muaj qhov ntev thiab tuab txaus. Feem ntau hais lus, qhov ntev thiab tuab ntawm tack weld yuav tsum tsis pub tsawg tshaj 80% ntawm qhov dav thiab tuab ntawm lub arc tsav phaj, thiab yuav tsum tau txuas txuas ntxiv. Nws tsis tuaj yeem yooj yim "spot" vuam. Nyob rau ntawm ob sab ntawm txoj hlua ntev, qhov tuab txaus weld yuav tsum tau ua kom zoo rau cov phaj nruab nrab thiab hnyav, thiab qee qhov zawj yuav tsum qhib yog tias tsim nyog.
3. Ua tib zoo saib xyuas qhov tack vuam ntawm lub davhlau ya nyob twg ntawm lub tog raj kheej
Txhawm rau kom nce ntxiv kev txwv ntawm qhov kawg ntawm kev sib tw ntev ntev thaum lub tog raj kheej yuav tsum tsis pub tsawg tshaj 100 hli, thiab cov weld thickness muaj txaus , thiab yuav tsum tsis muaj kab nrib pleb, Tsis zoo xws li tsis muaj fusion.
4. nruj me ntsis tswj cov vuam cua sov input
Thaum lub sij hawm welding txheej txheem ntawm cov hlab ntsha siab, cov welding cua sov input yuav tsum nruj me ntsis tswj, uas tsis yog tsuas yog los xyuas kom meej lub mechanical zog ntawm cov welded pob qij txha, tab sis kuj plays ib tug tseem ceeb luag hauj lwm nyob rau hauv kev tiv thaiv qhov tshwm sim ntawm cov kab nrib pleb. Qhov loj ntawm qhov vuam tam sim no ntawm submerged arc vuam muaj qhov cuam tshuam zoo rau qhov rhiab heev ntawm lub davhlau ya nyob twg tawg, vim tias qhov loj ntawm qhov vuam tam sim no ncaj qha cuam tshuam rau qhov kub thiab txias thiab qhov nyiaj ntawm vuam cua sov input.
5. nruj me ntsis tswj cov duab ntawm lub pas dej molten thiab vuam seam ua coefficient
Lub weld pas dej ua ke thiab kev sib sau coefficient ntawm submerged arc vuam yog ze ze rau qhov cuam tshuam ntawm vuam tawg. Yog li ntawd, qhov luaj li cas, zoo li cas thiab kev sib sau coefficient ntawm lub vuam pas dej ua ke yuav tsum tau nruj me ntsis tswj.
Plaub. Xaus
Nws yog qhov tsis tshua muaj tshwm sim los tsim cov kab nrib pleb ntev ntev ntawm cov kab nrib pleb hauv cov kab nrib pleb thaum cov khoom siv arc vuam yog siv los vuam cov kav ntev ntawm lub tog raj kheej, thiab nws tsis tau daws tau zoo rau ntau xyoo. Los ntawm kev ntsuam xyuas thiab kev tsom xam, lub ntsiab yog vim li cas rau lub davhlau ya nyob twg tawg ntawm submerged arc vuam longitudinal seam yog vim lub tensile kev nyuaj siab loj thiab tshwj xeeb kub qhov chaw nyob rau hauv no qhov chaw, uas yog tshwm sim los ntawm kev sib xyaw ua ke ntawm ob.
Kev xyaum tau ua pov thawj tias kev ntsuas xws li tsim nyog nce qhov loj ntawm arc ignition phaj, ntxiv dag zog rau kev tswj xyuas qhov zoo ntawm tack welding, thiab nruj me ntsis tswj tus nqi ntawm vuam cua sov input thiab cov duab ntawm cov weld tuaj yeem tiv thaiv qhov tshwm sim ntawm cov kab nrib pleb hauv submerged. arc vuam.
