Hydrogen yog kev hem thawj ntawm Vuam: txawm tias cov teeb meem me me tuaj yeem ua rau muaj kev puas tsuaj, txias, thiab txo qis zog. Cov teeb meem no tshwm sim thaum hydrogen atoms, qhia thaum lub ntsej muag vuam, tau daig hauv weld hlau lossis cua sov} kev kub ntxhov ntawm cov hlau txias. Kev tswj cov hydrogen yuav tsum tau ua kom mus ze rau txo nws cov kev taw qhia thiab txhawb nws txoj kev khiav dim ua ntej nws ua rau muaj kev puas tsuaj. Ntawm no yog ib kauj ruam - {{5} {}}} kauj ruam qhia rau cov hau kev zoo tshaj plaws.
1. Txo cov khoom nruab nrab hydrogen: Pib nrog cov khoom huv
Hydrogen hauv Welds feem ntau yog los ntawm cov dej noo, hydrocarbons, lossis paug rau ntawm cov hlau hauv paus, muab cov khoom siv vuam. Thawj kab ntawm kev tiv thaiv yog tshem tawm cov peev txheej no:
Ntxuav lub hauv paus hlau ua kom huv: tshem cov xeb, roj, roj, thiab thaj chaw noo noo (tsawg kawg 1-2 ntiv tes ntawm ob sab ntawm pob qij txha). Siv cov hlau txhuam, grinder, lossis cov kuab tshuaj (zoo li acetone) kom tshem tawm hydrocarbons (roj / roj), uas tawg rau hauv hydrogen thaum lub sij hawm vuam. Rau xeb (uas muaj dej), tu tshuab tu (sib tsoo) muaj txiaj ntsig zoo dua li cov kev siv tshuaj lom neeg, raws li nws tshem tawm cov dej noo {}} laden txheej tag nrho.
Tsis txhob txhob siv vuam hauv cov huab cua noo: Cov av noo siab taw qhia dej vapor rau hauv arc, uas cuam tshuam rau hauv hydrogen. Yog tias sib ntoo tawm sab nraud, siv lub tsev ntaub lossis vaj tse lossis chaw nkaum los ntawm thaj chaw los ntawm cov nag, huab, lossis lwg. Hauv kev cob qhia, tswj cov av noo nrog dehumidifirers (tsom rau<60% relative humidity). For critical work (e.g., pressure vessels), consider preheating the base metal to 200–300°F to evaporate surface moisture.
Xaiv cov qes - hydrogen muab chaw ua khoom: cov xaim hluav taws xob lossis hluav taws xob yog hydrogen yog qhov chaw hydrogen yog qhov tsis muaj paug. Siv qis - hydrogen (LH) Electrodes (piv txwv li, 7018) hloov chaw cellulosic (piv txwv li 6011), uas nqus tau ntau noo noo. Rau mig vuam, xaiv cov xov hlau cov khoom siv phom sij (piv txwv li, er70s {14} {{14} {{14} {{14} {{14} {
2. Lub khw muag khoom thiab kov cov hluav taws xob / muab tub lim cov ntaub ntawv
Tsawg - hydrogen electrodes thiab flux - hy6 1}} Hy1 Txoj kev txiav nruj thiab tuav tsis yog - sib ceg:
Khaws qis - hydrogen electrodes nyob rau hauv ib qhov cub kom qhuav: tom qab kev sib tw tso tawm hauv ib qhov cub kom sov: tom qab kev kawm tiav f (rau 7018) kom tiv thaiv kev nqus dej noo. Tsis txhob tso lawv raug rau cov pa loj rau ntau dua 1-2 teev; Txawm hais tias luv luv tuaj yeem qhia tau cov dej noo kev phom sij.
RE - Cov hluav taws xob qhuav yog tias muaj cov paib hluav taws xob (piv txwv li cov cim hluav taws xob tsis sib xws). Qhov no drives tawm ntawm kev ya raws ua ntej siv.
Siv cov yas tuav hluav taws xob Portable rau kev ua haujlwm: thaum vuam tawm ntawm qhov cub, nqa cov hluav taws xob hauv lub qhov cub "lub qhov cub portable" lossis lub qhov cub portable "lossis lub cub portable" lossis lub qhov cub portable rau kom siv.
3. Txhim kho cov vuam vuam kom txhawb hydrogen khiav dim
Vuam qhov tsis ncaj qha cuam tshuam ntau npaum li cas hydrogen yog daig hauv Weld. Lub hom phiaj yog khaws cov pas weld kub txaus rau hydrogen kom khiav raws li roj (es tsis txhob yaj mus rau hauv cov hlau) thaum tsis muaj cua sov ntau heev uas tsis muaj zog ntawm cov cua sov.
Kev tswj kev mus ncig ua si thiab tshav kub tshav kub: nrawm nrawm nrawm (hauv lub laj thawj qeeb) tso cai rau lub sijhawm Weld kom diffuse. Txawm li cas los xij, tshav kub ntau dhau tuaj yeem ua rau cov cua sov ntau dhau yuav ua rau muaj kev sib daj sib deev hauv cov haz, yog li kev sib npaug yog qhov tseem ceeb. Rau cov ntaub ntawv tuab, siv ntau cov kev hla nrog kev siv hluav taws kub nruab nrab dua li ib qho siab- kub dhau.
Zam kev vuam txias: vuam nrog kev ua kom tsawg dhau los yog nrawm nrawm nrawm nrawm tsim "Tus Kab Mob Weld RHOUNDIES sai sai, ntaiv helrogen. Xyuas kom meej thiab voltage yog ntsuas rau cov khoom tuab (piv txwv li, 1/4-nti hlau yuav tsum ~ 140-180 amps rau 7018 elecodes).
Siv txoj cai polarity: rau tsawg - hydrogen coldores zoo li 7018, uas txo cov cua sov- tus mob uas tuaj yeem ntxiab hydrogen npuas.
4. Post {{{{{}} Weld Kev Kho Tshav Kub: "Ci tawm" cuab rawg Hydrogen
Txawm hais tias ua tib zoo npaj, qee hydrogen yuav nyob hauv Weld. Tshaj tawm - Weld Kev Kho Mob Kub (Pwht) tuaj yeem "tsav tawm" cov hydrogen zoo ua ntej nws ua rau tawg.
Thov ib qho "hydrogen ci - tawm" Kev Kho Mob F Welded Filling rau 300-400 Welded sib koom tes rau 2-4 teev (nyob ntawm cov ntaub ntawv tuab). Qhov kub no yog qhov siab txaus kom tso cai rau hydrogen kom diffuse ntawm cov hlau tab sis qis txaus kom tsis txhob hloov weld cov khoom siv neeg kho tshuab.
Use post-weld stress relief for thick or high-strength steels: For materials prone to cold cracking (e.g., high-strength low-alloy (HSLA) steel or thick sections >1/2 nti), kev nyuaj siab nyem annealing (cua sov rau 1100-1200℃f) tsis tsuas yog txo cov kev ntxhov siab ntau tab sis kuj tseem yuav ua rau hydrogen khiav tawm. Qhov no yog qhov tseem ceeb rau cov qauv tshuaj hauv cov choj, cov hlab ntsha siab, lossis tshuab hnyav.
5. Xaiv txoj cai vuam cov txheej txheem thiab muab tub lim
Qee qhov vuam cov txheej txheem thiab ua kom tiav Inherently qhia ntau dua hydrogen ntau dua li lwm tus:
Ua ntej muaj tsawg - hydrogen cov txheej txheem: roj av hlau vuam (gtawb) nrog cov roj av vuam Rau pas vuam, siv qis - hydrogen electrodes (E7018, E8018) hloov cellulose ({8}.
Txhob txhob flux - Cov xaim xaim hauv cov xaim hluav taws xob: Thaum flux {1} {{1} {1} Cov pa tawm sab nraum zoov yooj yim, nws cov flux nqus dej noo yooj yim. Yog tias siv flux - Cored xov hlau, xaiv "Tsawg {4 4} hydrogen" Ntau yam thiab khaws cia rau hauv cov thawv ntim nrog Desiccants.
6. Tshawb xyuas thiab sim rau hydrogen -} Cov tsis xws luag
Txawm hais tias muaj kev ceev faj, cov teeb meem hydrogen yuav tshwm sim. Ntxov tau txais kom tsis txhob ua tiav:
Visual inspection: Look for surface porosity (small holes) or underbead cracking (visible in cross-sections). Porosity feem ntau qhia hydrogen enrapment thaum sorolification.
Tsis - Kev sim tshuaj (ndt): Siv cov kev kuaj ultrasonic (UT) lossis ntsuas hluav taws xob kev sib tsoo lossis pority nyob rau hauv cov khoom cuav. Rau siab - pipelines (hydrogen)
Tseem ceeb takaways: ib qho tagnrho
Tswj tswj hwm hydrogen hauv Welds tsis yog ib kauj ruam tab sis kev sib txuas ntawm kev tiv thaiv, txheej txheem tswj, thiab tshaj tawm {} Weld Saib Xyuas:
Pib los ntawm kev tshem tawm noo noo thiab paug los ntawm cov ntaub ntawv thiab hluav taws xob.
Siv tsawg - hydrogen fillers thiab cov txheej txheem, thiab lis lawv kom tsis txhob nqus dej noo.
Ua kom zoo rau kev siv cov khoom siv welameters cia hydrogen khiav tawm thaum cua txias.
Thov tshaj tawm - Weld Kev Kho Tshav Kub Rau Siab-}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} kev sib koom ua ke siab.
Los ntawm kev daws cov theem hydrogen ntawm txhua theem - los ntawm pre-}}}}} Cov khoom siv dawb uas tiv thaiv kev tawg thiab ua rau muaj kev tawg.
