Welding thick steel presents unique challenges, including ensuring sufficient penetration, avoiding cold lap, and preventing hydrogen-induced cracking. Tsis zoo li nyias cov hlau, uas tuaj yeem muab welded nrog cov khoom siv tuab, feem ntau yog cov khoom sib sib zog nqus, cov nqi sib sib zog nqus, muaj kev cuam tshuam loj, thiab tiv taus kom tsis xws luag nyob hauv cov nra hnyav. Xaiv txoj cai vuam pas nrig yog qhov tseem ceeb rau kev ua tiav muaj zog, ruaj ruaj rau hauv cov ntawv thov xws li kev siv hluav taws xob zoo li cov khoom siv, thiab cov nkoj tsim siab thiab siab siab. Cov xov xwm no tso tawm cov vuam vuam rod xaiv rau tuab hlau thiab lawv cov ntsiab lus tseem ceeb.
Qhov tseem ceeb kom cov tseev kom muaj rau vuam tuab hlau
Ua ntej dhia rau kev nce ntau ntau hom, nws yog qhov tseem ceeb kom nkag siab txog qhov xav tau ntawm tuab vuam:
Kev sib sib zog nqus: tuab hlau yuav tsum muaj cov electrodes uas muaj peev xwm yaj los ntawm ntau txheej, kom muaj kev sib sau ua ke ntawm cov hlau hauv weld. Kev nkag mus rau qhov chaw nres tsheb kom tsis muaj zog sib koom tes ua haujlwm tsis muaj kev ntxhov siab.
High Depupition efficiency: Vuam tuab hlau feem ntau cuam tshuam nrog ntau qhov kev hla. Cov hluav taws xob nrog tus nqi tso nyiaj siab txo cov tswv yim sib tw thiab txo cov lus tawm thaum tshav kub ua kom sov, uas tuaj yeem ntaus cov khoom.
Cov ntsiab lus hydrogen ntau: tuab hlau khaws cov cua sov ntev dua, tab sis txias txias tuaj yeem txua cov hydrogen nyob rau hauv weld, ua rau muaj kev tawg txias. Tsawg - hydrogen captelles mitister qhov kev pheej hmoo no.
Tag nrho - Txoj Haujlwm Muaj Peev Xwm: Ntau cov kab teeb tuab, xav tau vants, yog li cov electseads, yog li cov electseads, yog li cov electseades yuav tsum ua kom muaj kev ntseeg tau.
Pom zoo Vuam rods rau tuab hlau
1. E7018 thiab E7018 - 1 (cov hydrogen hlau hmoov elecodes)
E7018 thiab nws txoj kev txhim kho variant e7018 - 1 yog cov dav tshaj plaws cov hluav taws xob rau cov hlau tuab. Hais raws li cov roj tsawg-hydrogen hlau hmoov cov pas nrig, lawv tau txais txiaj ntsig zoo hauv cov ntawv thov txheej txheem uas muaj zog thiab tawg kuj yog qhov tseem ceeb.
Nkag mus thiab fusion: cov hlau hmoov hauv lawv cov txheej sib zog ua arc Zog, xa cov kev nkag mus rau hauv cov kab tuab. Qhov no kom ntseeg tau tias txhua weld pass bonds sib haum nrog cov kav hlau hauv paus thiab txheej yav dhau los.
Lub zog thiab tawv: nrog qhov tsawg kawg tensile lub zog ntawm 70,000 psi, e7018 pas dej ua kom muaj zog lossis tshaj lub zog ntawm cov hlau cov roj carbon hauv tuab. E7018 {- 1 muaj txhim kho qis qis - kub huv, ua rau nws zoo tagnrho rau sab nraum zoov lossis khaub thuas-ib puag ncig application.
Tsawg Hydrogen Advantage: lawv qhov qis - hydrogen txheej (tsawg dua 8 ml
Daim ntaub ntawv: Cov qauv hlau sib txuas (piv txwv li, Choj Girders, Cov Khaub Ncaws Tsev), cov tshuab hluav taws xob hnyav), cov tshuab siab hnyav, thiab siab lub nkoj zoo nkauj. E7018-1 yog nyiam rau cov phiaj xwm hauv huab cua txias lossis qhov cuam tshuam tsis kam, xws li crane booms.
2. E9018 {- b3 (siab {{{}} lub zog qes-alloy electrode)
Rau tuab siab - muaj zog tsawg -}}}}}} E9018-B3 yog ib qho kev xaiv zoo. Qhov no electrode kom phim cov khoom siv tshuab ntawm HSLA nrog lub zog tensile li 90,000 psi.
Alloy Compatibility: E9018-B3 muaj chromium, thiab vanadium, uas ntxiv dag zog rau cov hlau weld kom phim HSLA Steel lub zog siab. Qhov no zam "undermatching," qhov chaw weld yog qhov tsis muaj zog dua li cov hlau hauv paus.
COCK KHWV TAU: Cov ntsiab lus alloy kuj tseem ua kom tau siv Weld tsis kam lees cov hlau (ua rau cov tuab tuab
Vuam efficiency: zoo li E7018, E9018-B3 siv cov hmoov hlau depordion, txo tus naj npawb ntawm cov uas xav tau rau cov ntu tuab.
Cov kev txiav txim siab: nws yuav tsum tau nruj noo noo tswj - cov roj ntsha yuav tsum tau muab tso rau hauv hydroger f) los tiv thaiv kom ntau dua rau hydrogen tawg dua li cov hlau.
3. E6010 thiab E6011 (Cellulose electrodes)
Thaum lub sijhawm uas feem ntau paub rau kev siv vuam vuam, E6010 (DC- (AC / DC) yog qhov tseem ceeb rau cov hauv paus dhau hauv cov hlau tuab. Lawv siab - cellulose txheej ntawm arc uas txiav los ntawm xeb, nplai}} {{{{}} dawb hauv paus weld.
Cag pass Performance: Lub arc khaus heev ntawm E608 tsim kev nkag siab tob, zoo heev rau tsim kom muaj lub hauv paus muaj zog hauv Weld Past ntawm cov hlau tuab. Qhov no yog qhov tshwj xeeb tshaj yog rau beveled pob qij txha, uas cov hauv paus yuav tsum fuse kom tiv thaiv cov khoob khoob.
Slag removal: Their fast-freezing slag is easy to remove between passes, speeding up multi-pass welding.
Txwv: Cov pas nrig no muaj cov ntsiab lus hydrogen ntau dua li tsawg - hydrogen electrodes, yog li lawv feem ntau siv rau hauv paus passes. Tom qab sau thiab cap kis tau ua tiav nrog qis- hydrogen nas zoo li E7018 txhawm rau txo cov kev pheej hmoo.
Cov Kev Siv: Pipeline kev tsim kho (qhov twg cov kav dej tuab (qhov twg yog cov hauv paus hniav txhim khu kev ua haujlwm), ua haujlwm ntawm cov hlau xeb, thiab cov txheej txheem sib txuas nrog zeb nplai.
Hlau vuam rau cov hlau tuab nrog cov pas nrig
Txawm hais tias nrog tus pas nrig yog, vuam tuab steel yuav tsum muaj cov txheej txheem tsim nyog:
Beveling: Cov tuab hlau thaiv feem ntau yog beveled (v {{{} Groove, lossis ob npaug rau weld cheeb tsam thiab xyuas kom meej. E7018 thiab E9018-B3 ua tau zoo nyob rau hauv cov grooves, txhaws lawv tusyees nrog minimal porosity.
Ntau -}} dhau vuam: cov ntu tuab yuav tsum muaj ntau qhov kev hla. E7018 tus nqi xa nyiaj siab txo tus lej ntawm cov kab mob dhau, thaum E6010 / E6011 lub hauv paus ntawm lub hauv paus rau txheej txuas ntxiv rau txheej txuas ntxiv.
Preheating thiab post - Weld Kev Kho Mob Kub (PWHT): preheating tuab hlau mus rau 250-400℃Flue. Txog siab - kev siv ntxhov siab, duab (cua sov kom maj mam)
Vim li cas cov pas nrig outperform lwm tus rau tuab hlau
Lwm cov khoom siv hluav taws xob, xws li E6013 (hlau me) lossis E308 (stainless hlau), yog qhov tsawg dua rau cov tuab hlau:
E6013 tsis muaj qhov nkag mus thiab lub zog xav tau rau cov ntu tuab, thiab nws cov ntsiab lus hydrogen ntau ntxiv ua rau tawg kev pheej hmoo.
E308 yog tsim rau cov hlau tsis muaj roj hlau, tsis yog carbon lossis hsla steel, thiab nws qis tensile lub zog (65,000 psi) ua rau nws tsis zoo rau hnyav {lead tuab hlau daim ntawv thov.
Hauv kev sib piv, E7018, E9018-B3, thiab E6010 / E6011 (rau hauv paus kev cov nyom ntawm tuab hlau, los ntawm kev nkag mus ua kom tawg.
Tag
Rau tuab vuam, kev xaiv ntawm tus pas nrig nyob ntawm tus pas hlau hlau, lub zog yuav tsum muaj, thiab ib puag ncig cov xwm txheej:
Carbon Steel tuab seem: E7018 lossis E7018-1 yog qhov zoo tagnrho rau lawv qhov tob tob, thiab 70,000 psi zog.
Siab - muaj zog tsawg -}} Share HSLA lub zog thiab tiv taus nws haum rau cov khoom hnyav thiab cov kub.
Cag hla hauv tuab hlau: E6010 (DC) lossis E6011 (AC / DC) Xa cov hauv qab, nrog sau / Cap pib ua tiav nrog qis {} hydrogen pas nrig.
Tag nrho cov hluav taws xob ua ntej cov nqi sib sib zog nqus, tus nqi sib tw siab, thiab tawg tsis kam rau {{tus yuam sij tiv thaiv} tus yuam sij rau kev vam meej steel vuam. Thaum paired nrog kom tsim nyog preheating, multi-}}}}}}} Cov qauv siv hluav taws xob, lawv siv cov tshuab ua tiav, tshuab, thiab cov khoom siv vessel.
Rau welders ua haujlwm nrog tuab hlau, xaiv tus pas nrig yog tsis yog qhov tseem ceeb rau kev nyab xeeb thiab ntev}}}- stakes indakes txoj haujlwm.
