Puas yog 70 xyoo vuam pas yuav tsum tau ua kom sov?

In the world of welding, the 7018 welding rod is highly regarded for its ability to produce strong, high - quality welds. Nws yog dav siv nyob rau hauv cov txheej txheem vuam, kev lag luam zoo, thiab lwm cov ntawv thov uas weld lub zog thiab kav ntev tshaj plaws. Ib lo lus nug uas nquag tshwm sim thaum siv tus pas nrig no yog: "Puas yog 7018 Vuam Qws yuav tsum tau rhuab?" Cov lus teb yog muaj, thiab kev nkag siab vim li cas thiab yuav ua li cas kub nws yog qhov tseem ceeb rau kev ua tiav cov txiaj ntsig vuam zoo tshaj plaws.
Qhov laj thawj yog vim li cas 7018 vuam qws yuav tsum tau rhuab
7018 vuam pas nrig yog qhov qis- hydrogen electrode. Nws cov txheej muaj cov nyiaj tsawg ntawm hydrogen, uas yog qhov tseem ceeb rau kev tiv thaiv hydrogen {}} qhov ua rau muaj kev tawg hauv Weld. Hydrogen -} Qhov kev tawg yog qhov tsis xws luag uas tuaj yeem tshwm sim thaum hydrogen atoms yog cuab hauv weld hlau raws li nws txias. Cov atoms no tuaj yeem sib sau ua ke ntawm cov ntsiab lus ntxhov siab, ua rau cov kab nrib pleb uas txo qis lub zog ntawm Weld.
Txawm li cas los xij, 7018 vuam pas nrig muaj lub zog muaj zog los nqus dej noo los ntawm ib puag ncig ib puag ncig. Txawm nyob hauv cov xwm txheej qhuav, txheej ntawm tus pas nrig tuaj yeem khaws cov dej noo dhau sijhawm. Thaum noo noo yog tam sim no nyob rau hauv tus pas nrig, thaum lub sij hawm ua vuam, thaum tshav kub ntawm ARC yuav ua rau lub noo noo kom tawg, tso dej kom sov. This additional hydrogen increases the risk of hydrogen - induced cracking, especially in high - strength steels and thick - section welds.​
Cua sov lub 7018 vuam pas nrig yog tus txheej txheem hu ua "ci" lossis "ziab". Nws lub hom phiaj tseem ceeb yog tshem tawm cov dej noo uas tus pas nrig tau nqus. Los ntawm cua sov lub pas dej rau ib qho kev kub tshwj xeeb, noo noo nyob rau hauv txheej yog evaporated, kom ntseeg tau tias cov hydrogen tso tawm thaum lub sij hawm vuam tau khaws cia tsawg kawg nkaus. Qhov no pab kom muaj kev tswj hwm qis- hydrogen cov yam ntxwv ntawm tus pas nrig thiab txo qhov kev pheej hmoo ntawm kev tawg, kom muaj kev sib kis tau ntawm Weld.
Qhov tseeb tiag tiag txoj kev ua rau 7018 vuam qws
Txhawm rau kom tau tshem tawm noo noo los ntawm 7018 vuam pas nrig, cov txheej txheem cua sov tshwj xeeb yuav tsum tau ua raws. Cov neeg Asmeskas cov neeg siv hluav taws xob (AWS) tau tsim cov lus qhia rau lub ci ntawm qis- hydrogen electrodes zoo li 7018.
Tus qauv ci kub rau 7018 vuam pas nrig yog nruab nrab ntawm 500℃f thiab 600℃f (260℃thiab 315 degree). Cov pas nrig yuav tsum tau ua kom sov ntawm qhov kub no rau lub sijhawm 1 txog 2 teev. Lub sijhawm no thiab kub txaus kom tsav tawm cov dej noo los ntawm cov txheej uas tsis muaj kev ua kom lub pas dej ua kom puas.
Nws yog ib qho tseem ceeb kom nco ntsoov tias cov txheej txheem cua sov yuav tsum tau ua nyob rau hauv qhov cub calibrated zoo tsim rau vuam pas nrig cia thiab ci. Cov ncu no muaj qhov kub tsis sib xws thoob plaws, kom txhua tus pas nrig tau ua kom sov. Cov pas nrig yuav tsum muab tso rau hauv qhov cub hauv txoj kev uas tso cai rau cov cua hauv siab ib puag ncig lawv, uas pab hauv qhov chaw noo ntawm noo noo.
Tom qab ci, yog tias 7018 vuam pas nrig tsis tau siv tam sim ntawd, lawv yuav tsum tau khaws cia hauv kev tuav lub qhov cub. Cov kev tuav lub qhov cub yuav tsum tau teeb tsa ntawm qhov kub ntawm 250℃f txog 300℃f (121℃rau 149 degree). Qhov no ua rau cov pas nrig qhuav thiab tiv thaiv lawv los ntawm reabsorbing noo noo los ntawm huab cua. Yog tias cov pas nrig tau tawm ntawm kev tuav lub qhov cub thiab tsis siv nyob rau hauv ib lub sij hawm ib txwm (feem ntau yog cov av noo
Qhov tshwm sim ntawm tsis pub cua sov 7018 vuam qws
Ua tsis tau tshav kub 7018 vuam pas nrig lossis tsis muaj cua sov rau lawv tuaj yeem muaj kev rau txim loj rau cov weld zoo.
Ib qho ntawm cov teeb meem tseem ceeb tshaj plaws yog nce kev pheej hmoo ntawm hydrogen -}}}} ua rau tawg. Raws li tau hais ua ntej, noo nyob rau hauv ROD ROIGHT Hydrogen thaum lub sij hawm vuam. Cov hydrogen no tuaj yeem raug daig hauv Weld, ua rau cov kab nrib pleb uas yuav tsis pom lub qhov muag liab qab tab sis tuaj yeem ua rau muaj zog weld ho tsis muaj zog. Hauv cov ntawv thov tseem ceeb xws li kev tsim kho choj lossis lub nkoj siab ua haujlwm, cov kab nrib pleb no tuaj yeem ua rau kev puas tsuaj loj.
Ntxiv rau kev tawg, unheated 7018 cov pas nrig tuaj yeem ua rau lwm yam weld tsis xws luag. Lub xub puag ntawm noo noo tuaj yeem ua rau muaj kev puas ntsoog hauv Weld. Porosity yog qhov tsim ntawm cov qhov me me hauv weld hlau, uas txo tus ntoo khaub lig {3} Ntu ntu ntawm Weld thiab yog li nws lub zog. Nws tseem ua rau muaj kev rau Weld ntau rau kev xeb.
Lwm qhov teeb meem tsis zoo arc stability. Noog noo nyob rau hauv txheej yuav cuam tshuam rau arc, ua rau nws mus rau kev tawm thiab tsis ruaj khov. Qhov no ua rau muaj Weld Weld hlaws, nrog cov xwm txheej tsis xwm yeem xws li undercutting thiab sib tshooj. Cov tsis zoo no tsis tsuas yog cuam tshuam rau cov tsos ntawm weld tab sis kuj yog nws cov khoom siv khoom siv.
Kev txiav txim siab tshwj xeeb rau kev siv 7018 Vuam qws tom qab cua sov
Txawm tias tom qab muab cua kub kom zoo rau 7018 vuam pas nrig, muaj qee qhov kev txiav txim siab tshwj xeeb kom peb tau kev ua tau zoo.
Thaum muab cov pas nrig tawm ntawm kev tuav lub qhov cub, nws yog qhov zoo tshaj plaws los siv lawv sai li sai tau. Yog tias lawv raug rau huab cua rau ncua sijhawm, lawv yuav nqus dej noo. Nyob rau hauv high - av noo ib puag ncig (txheeb ze cov av noo siab dua 80%), lub sijhawm pub luv, qee zaum tsawg li 1 txog 2 teev.
Yog tias 7018 cov pas nrig tau raug rau cov huab cua dhau lub sijhawm pub rau lub sijhawm, lawv yuav tsum tau rov - ci. Txawm li cas los xij, nws yog ib qho tseem ceeb kom tsis txhob tshaj - ci lub pas nrig. Rov ua dua li ci los yog ci ntawm qhov kub siab dua li pom zoo yuav ua rau cov txheej kom tawg. Qhov no tuaj yeem ua rau tsis tau ARC kev ua tau zoo, nce ntxiv, thiab txo qis ntawm tus pas nrig ua suab muaj peev xwm tsim cov suab.
Nws yog qhov tseem ceeb rau lis cov rhuab 7018 pas nrig nrog kev saib xyuas. Cov pas nrig tuaj yeem kub tom qab ci, yog li siv cua sov -} cov hnab looj tes tiv hnab looj tau tsim nyog kom tsis txhob kub hnyiab. Ib qho ntxiv, poob lossis ua kom cov pas nrig tuaj yeem ua rau cov txheej txheej kom nti lossis tawg, uas cuam tshuam rau lawv cov kev ua tau zoo.
Hauv kev xaus, lub 7018 vuam pas dej yuav tsum tau ua kom sov. Cua sov yog kauj ruam tseem ceeb nyob rau hauv kom ntseeg tau tias tus pas nrig weld tsis muaj kev phom sij xws li hydrogen {}} Cov kev pheej hmoo ntawm weldogen thiab porosity, thiab tsim muaj zog, txhim khu kev qha welds. Los ntawm kev ua raws li cov cua sov kom raug thiab cov txheej txheem cia, welders tuaj yeem ua kom zoo tshaj plaws ntawm 7018 vuam pas nrig ntawm 70 xyoo thiab xyuas kom qhov zoo ntawm lawv cov welds. Txawm hais tias nyob rau hauv kev siv vuam lossis lwm cov ntawv thov tseem ceeb, kev kub loj yog ib qho kev coj ua uas yuav tsum tsis txhob saib dhau.