Vuam S235J2W Corten steel nyob rau hauv qhov kub tsis tshua muaj kev sib tw tshwj xeeb. Thaum qib "J2" lav qhov cuam tshuam zoo ntawm cov hlau hauv paus mus rau -20 degree, cov txheej txheem vuam nws tus kheej tuaj yeem tsim qhov tsis zoo. Qhov kev pheej hmoo tseem ceeb yoghydrogen-induced txias cracking, nkig tsis ua hauj lwm uas tuaj yeem tshwm sim hauv tshav kub - thaj chaw cuam tshuam (HAZ) lossis vuam hlau teev tom qab vuam. Kev tiv thaiv nws yuav tsum muaj lub tswv yim zoo tsom rau kev tswj hwm hydrogen, tswj kev ntxhov siab thermal, thiab ua kom cov hlau tsis muaj zog.
Lub hauv paus ntsiab lus tseem ceeb: "Peb Pillars" ntawm Kev Tiv Thaiv Kev Txhaum Cai
Kev tawg tshwm sim thaum muaj peb yam tshwm sim ib txhij: anyuaj, susceptible microstructure, tensile kev nyuaj siab, thiabhydrogen. Koj lub hom phiaj yog tshem tawm tsawg kawg ib qho, qhov zoo tshaj plaws, ntawm cov xwm txheej no.
Plaub -Txoj Kev Taw Qhia rau Kev Nyab Xeeb Tsawg-Vuam Kub
1. Tswj cov khoom siv vuam siv hluav taws xob (Attack Hydrogen ntawm qhov chaw)
Cov electrode los yog hlau yog qhov feem ntau ntawm hydrogen.
Siv Low-Hydrogen (AWS/EN "H5" or lower) Consumables: Siv cov electrodes nruj me ntsis raws li qis -hydrogen. Cov no tau ntim rau hauv cov thawv ntim hermetically kom tiv thaiv kom txhob ya raws.
Ua raws li Strict Storage & Re-Txoj Cai Qhuav: Khaws cov khoom siv rau hauv lub txee rhuab ntawm 100-150℃. Yog tias raug huab cua, ua raws li cov chaw tsim khoom cov lus qhia kom rov ua kom qhuav.Tsis txhob siv damp electrodes.
2. Ua hauj lwm cov txheej txheem vuam tsim nyog (Tswj kub thiab kev ntxhov siab)
Cov txheej txheem vuam tsim nyog (WPS) tsis yog -xav tau.
Nce Preheats thiab Interpass Temperatures: Preheating lub hauv paus hlau (feem ntau mus rau 50-100 degree, nyob ntawm thickness thiab ambient kub) slows tus nqi txias. Qhov no tiv thaiv kev tsim ntawm ib qho nyuaj, tawg-rhiab martensitic microstructure nyob rau hauv HAZ thiab tso cai rau hydrogen diffuse tam sim ntawd.Interpass kub yuav tsum tau khaws cia siab tshaj qhov tsawg kawg nkaus no.
Optimize Thaum tshav kub kub input: Siv cov khoom siv hluav taws xob nruab nrab-tsis qis dhau (ua rau txias txias thiab tawv) lossis siab dhau (tuaj yeem ua rau cov khoom siv hlau tsis zoo). WPS yuav txhais qhov no.
3. Tswj Vuam ib puag ncig (Mitigate External Risks)
Qhov xwm txheej ambient yog qhov hloov pauv tseem ceeb uas koj yuav tsum tswj hwm.
Tsim ib qho chaw ua haujlwm Sheltered: Erect windbreaks thiab tsev pheebsuab los tiv thaiv thaj tsam weld los ntawm cua, uas ceev ceev cov weld, thiab los nag / daus, uas qhia hydrogen thiab ua rau thermal shock.
Ua kom sov lub Base Hlau: Yog tias cov hlau nws tus kheej qis dua 0 degree, siv cov pam cua sov kom nce nws qhov kub siab tshaj qhov teev preheatua ntej tawm tsam arc.
4. Ua Kev Tshaj Tawm -Kev Ua Zoo Tshaj Plaws
Txoj haujlwm tsis ua tiav thaum lub arc nres.
Siv Post-Weld Heat Treatment (PWHT) yog tias muaj: Rau cov ntu tuab lossis cov pob qij txha nruj heev, tswj taukev nyuaj siab nyem ci(piv txwv li, 550-600 degree) yog txoj hauv kev zoo tshaj plaws los tua cov hydrogen thiab so cov kev ntxhov siab uas seem.
Siv rwb thaiv tsev rau qeeb txias: Es tsis txhob quenching nyob rau hauv cov huab cua txias, qhwv lub tiav weld nyob rau hauv ib daim pam insulating kom cia ib tug maj mam, tswj txias- cia.
Daim ntawv txheeb xyuas qhov ua tau zoo rau ntawm -Qhov Chaw Vuam
| Kauj ruam | Action nyob rau hauv ib txwm huab cua | Kev hloov kho tseem ceeb rau qis-Temp Vuam |
|---|---|---|
| 1. Kev npaj | Ntxuav qhov sib koom ua ke ntawm xeb, noo noo, xim. | Ua kom huv si thiab xyuas kom cov chaw qhuav thiab sov kom kov. |
| 2. Cov khoom siv | Siv cov -hydrogen rods qis los ntawm kev cia qhuav. | Xyuas kom cov pas nrig yog los ntawm qhov cub, siv sijhawm luv luv. |
| 3. Ib puag ncig | General cua / huab cua tiv thaiv. | Yuav tsum tau enclosed, rhuab vaj tse. Saib xyuas ambient temp tas li. |
| 4. Preheat | Thov raws li WPS (tej zaum yuav tsawg). | Nce preheat los ntawm 25-50℃siab tshaj WPS yam tsawg kawg nkaus. Siv temp sticks lossis IR phom. |
| 5. Vuam | Khaws qhov kub ntawm qhov sib txawv. | Saib xyuas interpass temp ntau zaus; siv cua sov los tswj nws. |
| 6. Ua tiav | Cia kom txias. | Insulate weld rau qeeb txias. Ua PWHT yog tias xav tau. |
Los ntawm cov txheej txheem hais txog cov peev txheej ntawm hydrogen, tswj cov txheej txheem thermal, thiab tiv thaiv kev ua haujlwm ntawm ib puag ncig, koj tuaj yeem ua tiav vuam S235J2W Corten steel hauv qhov kub thiab txias yam tsis muaj kev cuam tshuam rau kev ncaj ncees ntawm koj cov qauv. Ib txwm sab laj thiab tsim nyog cov txheej txheem nrog tus kws ua haujlwm vuam, tshwj xeeb tshaj yog rau cov ntawv thov tseem ceeb.
