25. Txhim kho thiab ua teb Fabrication kev coj ua
Q1: Dab tsi yog qhov kev coj ua zoo tshaj plaws rau kev tuav thiab khaws q355b kav?
A1: Tsim kom zoo tuav preserves q355b yeeb nkab zoo thaum lub teeb. Siv cov nylon slings lossis padded hooks los tiv thaiv cov txheej txheem kev puas tsuaj. Tsis txhob rub cov kav dej hla cov nplaim hluav taws uas tuaj yeem khawb cov txheej txheem tiv thaiv. Cov khw kav dej ntawm cov ntoo txhawb nqa spaced txhua 2-3 meters kom tiv thaiv sagging. Tshooj Qhov Siab yuav tsum tsis txhob tshaj cov lus pom zoo tsim khoom lag luam (feem ntau 10-15 kav). Tiv thaiv cov yeeb nkab xaus los ntawm kev puas tsuaj siv lub kaus mom yas lossis cov ntoo ntoo. Sab nraum zoov cia yuav tsum tau npog kom tsis txhob muaj dej sib txuam hauv cov kav dej. Tsim nyog ua kom tsim nyog tswj kev tswj hwm qhov tseeb thiab cov mob nto txwv tseem ceeb rau kev ua haujlwm tom ntej.
Q2: Yuav ua li cas yuav tsum tau ua thiab npaj ua haujlwm?
A2: kev txiav txim teb yuav tsum tau ua kom tau cov txheej txheem ceev faj kom ntseeg tau cov txiaj ntsig zoo. Txias lub ntsej muag yog nyiam kom tiv thaiv tshav kub kub ntxhov- cuam tshuam cov thaj {}} abrasive txiav tej zaum yuav siv nrog cua txias. Txiav xaus yuav tsum yog square hauv 1 Qib ntawm perpendicularity rau kom zoo haum- Up. Bevel Kev npaj ua raws cov ces kaum (feem ntau 30 {{{{{{}} 37.5 degree) nrog cov av me me. Sib tsoo tshem tawm tag nrho cov kev txiav burrs thiab tsim cov chaw yooj yim hloov chaw. Kev ntxuav tu tag nrho cov kev paug (roj, xeb, nplai) los ntawm cov chaw weld. Cov kev npaj kom zoo ua kom muaj kev ua haujlwm zoo hauv daim teb zoo nkauj thiab tiv thaiv qhov tsis xws luag uas tuaj yeem ua rau muaj kev ncaj ncees.
Q3: Dab tsi yog qhov tseem ceeb rau kev teb vuam q355b kav?
A3: Field welding demands strict adherence to qualified procedures. Preheat requirements (typically 100-150°C for thicknesses >20mm) yuav tsum tau ua raws li siv qhov kub -}} qhia cov xaum xim lossis tiv tauj pyrometers lossis hu rau Pyrometers. Tsawg - hydrogen mround electrodes (E7015, E7016) khaws cia hauv cov dej sov kom tiv thaiv nqus dej noo. Vuam seedence minimizes distortion {{}}}} ib txwm hloov sib txawv ntawm ob tog rau welds. Kev Kub Kub Tswj Kub (Max 250 Qib) tiv thaiv kev tawm ntau dhau. Rov qab ua kom huv tej zaum yuav tau rau hauv paus hla dhau cov ntawv thov tseem ceeb. Post - Weld Scharpection suav nrog kev pom tseeb, zas penetrant, thiab ultrasonic kev kuaj mob raws li tau teev tseg. Kev tsim nyog ua teb vuam ua kom tau cov pob qij txha sib koom ua ke tau raws cov qauv tsim nyog muaj cai txawm tias muaj mob hnyav.
Q4: Yuav ua li cas yuav tsum tau sib txuas Flange yuav ntsia hauv daim teb?
A4: Flange installation ua raws cov kauj ruam tshwj xeeb rau xau-} dawb ua tau. Xyuas cov ntsej muag flange huv, tsis muaj kev tsis muaj kev tsis muaj kev tsis muaj kev sib luag, tsawg dua lossis sib npaug rau 0.2 hli sib txawv). Nruab cov gaskets nruab thiab undamaged - Kauv qhov taub hom rau feem ntau muaj cov ntawv thov. Bolt Zawm ua raws cov qauv bisscross hauv ntau kis (30%, 70%, 100% ntawm qhov kawg torque). Siv calibrated torque wrenches thiab tsim nyog lubrication ntawm xov. Qeb kawg yuav tsum tau raws li lub txiaj ntsig ntawm kev tsim kho (feem ntau tsawg dua lossis sib npaug rau 1mm offset). Siab sim tshawb xyuas cov kev sib koom ua ke ncaj ncees ua ntej kev ua haujlwm. Qhov tsim hluav taws xob flange tiv thaiv tiv thaiv thiab ua kom ntev- sij hawm reliability ntawm cov tshuab raj.
Q5: Dab tsi yog cov txheej txheem kho kom zoo li cas rau Q355B kav?
A5: Kev kho teb cov lus teb nyob rau ntau yam xwm txheej kev puas tsuaj. Rau txheej kev puas tsuaj, ntxuav rau liab qab hlau thiab siv cov txheej txheej yooj yim nrog 50 hli sib tshooj. Me me ntsaum (<10% diameter) may be acceptable if no cracking exists. Weld repairs of defects require complete removal of damaged material and proper rewelding. Full-encirclement split sleeves provide structural reinforcement for more extensive damage. Temporary composite wraps can seal leaks until permanent repairs are made. All repairs should follow qualified procedures and be inspected to ensure they restore original design integrity. Documentation of repairs aids future maintenance planning.
