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Yuav ua li cas xaiv cov khoom siv vuam rau li qub?
2021-09-24 IB
Vuam yog tsuas yog siv rau surfacing welding ntawm valve sealing nto, kho vuam ntawm casting defects thiab vuam yuav tsum tau los ntawm cov khoom qauv. Kev xaiv cov khoom siv vuam yog cuam tshuam nrog nws cov txheej txheem txheej txheem. Cov khoom siv hauv electrode arc vuam, plasma arc vuam, submerged arc vuam thiab carbon dioxide gas shielded vuam yog txawv. Qhov feem ntau thiab feem ntau siv vuam txoj kev yog ntau yam khoom siv hauv electrode arc vuam. 01 Qhov yuav tsum tau muaj rau cov vuam siv lub valve Lub valve yog cov kav dej siab. Cov txheej txheem kev txawj ntse thiab cov txheej txheem vuam ntawm cov welder ncaj qha cuam tshuam rau cov khoom ua cim thiab kev ruaj ntseg ntau lawm, yog li nws yuav tsum nruj me ntsis kom cov welder. Vuam yog txheej txheem tshwj xeeb hauv kev tsim cov khoom lag luam valve, thiab yuav tsum muaj kev tshwj xeeb rau cov txheej txheem tshwj xeeb, suav nrog kev tswj thiab tswj cov neeg ua haujlwm, khoom siv, txheej txheem thiab cov khoom siv. Lub vuam yuav tsum dhau qhov kev paub txog kev paub thiab kev tswj xyuas qhov tseeb ntawm kev kuaj xyuas kom raug rau boiler thiab lub nkoj siab welders, tuav daim ntawv pov thawj (daim ntawv pov thawj), thiab tuaj yeem koom ua haujlwm vuam hauv lub sijhawm siv tau. 02 Kev khaws cia rau lub valve electrodes 1) Ua tib zoo saib xyuas cov av noo nyob ib puag ncig kom tiv thaiv cov pas nrig los ntawm kev ntub dej. Cov av noo nyob rau hauv cov huab cua yuav tsum tsawg dua 60% thiab ib qho kev ncua deb ntawm av los yog phab ntsa. 2) Paub qhov txawv ntawm tus qauv ntawm vuam pas nrig thiab qhov tshwj xeeb yuav tsum tsis txhob totaub. 3) Thaum lub sij hawm thauj mus los thiab stacking, xyuam xim tsis txhob ua puas lub txheej, tshwj xeeb tshaj yog stainless hlau electrode, surfacing electrode thiab cam khwb cia hlau electrode. 03 Vuam kho valve castings 1) Vuam kho yog tso cai rau valve castings nrog xuab zeb inclusion, tawg, cua qhov, xuab zeb qhov, looseness thiab lwm yam tsis xws luag, tab sis cov roj stain, xeb, noo noo thiab tsis xws luag yuav tsum tau muab tshem tawm ua ntej vuam. Tom qab tshem tawm qhov tsis xws luag, polish cov hlau luster nrog sandpaper. Nws cov duab yuav tsum du, nrog ib qho kev nqes hav thiab tsis muaj cov npoo ntse. Yog tias tsim nyog, kev tswj xyuas tsis muaj kev puas tsuaj yuav tsum tau ua los ntawm cov hmoov av lossis cov kua dej nkag, thiab kev kho cov vuam tuaj yeem ua tau tsuas yog thaum tsis muaj qhov tsis xws luag. 2) Kev kho vuam tsis raug tso cai yog tias muaj cov kab nrib pleb hnyav, qhov txias txias, qhov pores ntawm honeycomb, qhov loj ntawm qhov porosity ntawm lub siab bearing steel castings, thiab tsis muaj qhov tsis xws luag yuav raug tshem tawm lossis cov khoom tsis tuaj yeem kho thiab polished tom qab kho. vuam. 3) Tus naj npawb ntawm kev rov ua dua vuam tom qab kev ntsuas qhov siab ntawm cov kabmob steel casting plhaub yuav tsum tsis pub tshaj ob zaug. 4) Lub casting yuav tsum polished tiaj tus thiab du tom qab vuam kho, thiab tsis muaj qhov pom tseeb vuam kho kab yuav tsum tau sab laug. 5) NDT qhov yuav tsum tau ua ntawm castings tom qab vuam kho yuav tsum tau ua raws li cov qauv tsim nyog. 04 Kev kho kev ntxhov siab ntawm lub valve tom qab vuam 1) Rau qhov tseem ceeb weldments, xws li vuam ntawm thermal rwb thaiv tsev lub tsho, lub vuam ntawm lub rooj zaum ntawm lub rooj zaum hauv lub valve lub cev, lub ntsej muag sealing nto yuav tsum tau kho tom qab vuam, thiab kev kho vuam ntawm cov kabmob siab. castings ntau tshaj li qhov tau teev tseg, qhov kev ntxhov siab vuam yuav tsum raug tshem tawm tom qab vuam. Yog tias nws tsis tuaj yeem nkag mus rau hauv lub qhov cub, txoj kev tshem tawm kev ntxhov siab hauv zos tuaj yeem raug coj los siv. Cov txheej txheem ntawm kev tshem tawm cov kev ntxhov siab welding tuaj yeem xa mus rau phau ntawv welding qws. 2) Qhov kev ntxhov siab vuam yuav tsum raug tshem tawm tom qab vuam yog tias qhov vuam kho qhov tob tshaj 20% ntawm phab ntsa tuab lossis 25 hli lossis thaj tsam ntau dua 65C ㎡ thiab lub plhaub kuaj cov xau. 05 Valve welding txheej txheem tsim nyog Kev xaiv kom raug ntawm vuam pas nrig tsuas yog qhov txuas tseem ceeb hauv cov txheej txheem tshwj xeeb ntawm vuam. Nws tsuas yog xaiv qhov tseeb ntawm vuam pas nrig. Yog tsis muaj kev lav phib xaub ntawm cov khoom dhau los, nws yog tsis yooj yim sua kom tau txais kev vuam zoo. Txij li thaum vuam zoo ntawm electrode arc vuam yog txawv los ntawm qhov tseem ceeb tsis tau teev los ntawm qhov zoo ntawm electrode nws tus kheej, txoj kab uas hla ntawm electrode, lub hauv paus hlau, thickness ntawm lub hauv paus hlau, weld txoj hauj lwm, preheating kub thiab saws tam sim no, them sai sai rau cov kev hloov ntawm cov no. tsis tseem ceeb. Nyob rau hauv cov khoom valve, cov txheej txheem vuam tsim nyog suav nrog surfacing ntawm sealing nto, inlay vuam ntawm lub rooj zaum thiab lub valve lub cev thiab vuam kho ntawm qhov chaw siab. Rau cov txheej txheem tshwj xeeb tsim nyog, thov xa mus rau ASME ntu IX vuam thiab brazing kev tsim nyog tus qauv thiab Tuam Tshoj tus qauv kev lag luam tshuab JB / T 6963 fusion vuam txheej txheem tsim nyog ntawm cov hlau qhov chaw.