Nkag Siab Txog Cov Ntsiab Lus Tseem Ceeb ntawm Cov Hluav Taws Xob Uas Muaj Hydrogen Tsawg

Kev paub txog cov hauv paus txog E7018 cov electrodes uas muaj hydrogen tsawg yuav pab tau rau kev nkag siab txog yuav ua li cas kom ua haujlwm tau zoo tshaj plaws, ua tau zoo thiab cov vuam uas lawv tsim tau.

Kev vuam hlau nplaum tseem yog qhov tseem ceeb rau ntau txoj haujlwm vuam, ib feem vim tias cov ntaub ntawv siv hauv ntau daim ntawv thov txuas ntxiv qiv lawv tus kheej rau cov txheej txheem, thiab nws yog ib qho uas ntau tus neeg ua haujlwm vuam paub zoo. Thaum nws los txog rau kev vuam hlau nplaum, American Welding Society (AWS; Miami, FL) E7018 stick electrodes yog qhov kev xaiv ntau vim tias lawv muab cov khoom siv kho tshuab thiab tshuaj lom neeg tsim nyog rau ntau yam kev siv, nrog rau cov hydrogen qis los pab tiv thaiv kev tawg hydrogen.

Kev paub txog cov ntsiab lus tseem ceeb txog E7018 cov electrodes uas muaj hydrogen tsawg yuav pab tau rau kev nkag siab txog lawv txoj haujlwm, kev ua tau zoo, thiab cov vuam uas tshwm sim. Feem ntau, E7018 cov electrodes muaj cov qib spatter tsawg thiab lub arc du, ruaj khov, thiab ntsiag to. Cov yam ntxwv hlau no muab rau tus neeg ua haujlwm vuam tswj tau zoo ntawm lub arc thiab txo qhov xav tau kev ntxuav tom qab vuam - ob qho tib si tseem ceeb hauv cov ntawv thov uas xav tau kev saib xyuas zoo rau qhov zoo ntawm vuam thiab cov cua sov nkag, thiab cov uas nyob rau lub sijhawm kawg.

Cov electrodes no muaj cov nqi tso tawm zoo thiab nkag mus zoo, uas txhais tau tias cov neeg ua haujlwm vuam tuaj yeem ntxiv cov hlau vuam ntau dua rau hauv qhov sib koom ua ke hauv ib lub sijhawm ntau dua li ntau lwm cov electrodes stick (xws li E6010 lossis E6011), thiab tseem tuaj yeem zam qhov tsis zoo ntawm vuam xws li tsis muaj kev sib xyaw. Kev ntxiv cov ntsiab lus xws li hmoov hlau, manganese, thiab silicon rau cov electrodes no muab cov txiaj ntsig sib txawv, suav nrog (tab sis tsis txwv rau) lub peev xwm los vuam zoo los ntawm qee qhov av, cov khib nyiab, lossis qhov ntsuas zeb.

Qhov arc zoo pib thiab rov pib dua, uas pab tshem tawm cov teeb meem xws li porosity thaum pib ntawm qhov vuam, yog qhov txiaj ntsig ntxiv ntawm E7018 stick electrodes. Rau kev rov ua dua zoo (pib qhov arc dua), nws yog qhov tsim nyog ua ntej tshem tawm cov silicon deposit uas tsim nyob rau ntawm qhov kawg ntawm lub electrode. Txawm li cas los xij, nws yog ib qho tseem ceeb kom txheeb xyuas txhua qhov yuav tsum tau ua ntej vuam, vim tias qee cov lej lossis cov txheej txheem tsis tso cai rau kev rov ua dua ntawm cov stick electrodes.

Raws li tau hais tseg hauv lawv qhov kev faib tawm AWS, E7018 stick electrodes muab qhov tsawg kawg nkaus ntawm 70,000 psi tensile zog (xaiv los ntawm "70") thiab tuaj yeem siv rau hauv txhua qhov chaw vuam (xaiv los ntawm "1"). Tus "8" hais txog cov txheej txheem hydrogen qis, nrog rau qhov nkag mus nruab nrab uas electrode muab thiab cov hom tam sim no nws xav tau rau kev ua haujlwm. Nrog rau tus qauv AWS kev faib tawm, E7018 stick electrodes tuaj yeem muaj cov cim ntxiv xws li "H4" thiab "H8" uas hais txog qhov ntau ntawm cov hydrogen diffusible uas cov hlau filler tso rau hauv qhov vuam. Piv txwv li, H4 lub npe qhia tias qhov chaw vuam muaj 4 ml lossis tsawg dua ntawm cov hydrogen diffusible ib 100 g ntawm cov hlau vuam.

Cov electrodes uas muaj tus cim "R" — xws li E7018 H4R — tau dhau los ntawm kev sim tshwj xeeb thiab tau raug suav hais tias tiv taus dej noo los ntawm cov chaw tsim khoom. Yuav kom tau txais tus cim no, cov khoom yuav tsum tiv taus dej noo hauv qhov ntau yam tom qab raug rau qhov kub thiab txias 80 deg F thiab 80 feem pua ​​​​​​ntawm cov dej noo rau cuaj teev.

Thaum kawg, kev siv "-1" ntawm kev faib tawm electrode stick (piv txwv li E7018-1) txhais tau tias cov khoom muaj kev cuam tshuam zoo dua los pab tiv thaiv kev tawg hauv cov ntawv thov tseem ceeb lossis ntawm qhov kub qis dua.

Cov electrodes E7018 uas muaj cov hydrogen tsawg tuaj yeem ua haujlwm nrog lub zog hluav taws xob tas mus li (CC) uas muab hluav taws xob hloov pauv (AC) lossis hluav taws xob ncaj qha (DCEP). Cov hlau E7018 muaj cov khoom siv arc stabilizers ntxiv thiab/lossis hmoov hlau hauv txheej kom pab tswj kom muaj arc ruaj khov thaum vuam siv hluav taws xob AC. Qhov zoo tshaj plaws ntawm kev siv AC nrog E7018 electrodes yog tshem tawm cov arc blow, uas tuaj yeem tshwm sim thaum vuam DC siv cov av tsis zoo lossis thaum vuam cov khoom magnetized. Txawm hais tias muaj cov khoom siv arc stabilizers ntxiv, cov vuam ua siv AC yuav tsis du zoo li cov uas ua nrog DC, txawm li cas los xij, vim muaj kev hloov pauv tas mus li hauv kev coj tam sim no uas tshwm sim txog li 120 zaug hauv ib ob.

Thaum vuam nrog DCEP tam sim no, cov electrodes no tuaj yeem muab kev tswj hwm yooj yim dua ntawm lub arc thiab lub vuam zoo nkauj dua, vim tias qhov kev taw qhia ntawm cov dej ntws yog tas li. Rau qhov zoo tshaj plaws, ua raws li cov lus qhia ntawm cov chaw tsim khoom rau cov kev ua haujlwm rau lub electrode txoj kab uas hla.

Ib yam li txhua txoj kev thiab electrode, kev siv cov txheej txheem kom zoo thaum vuam nrog E7018 stick electrodes yog qhov tseem ceeb kom ntseeg tau tias qhov vuam zoo. Tuav qhov ntev ntawm arc kom nruj - zoo tshaj plaws yog khaws lub electrode kom nyob saum toj ntawm qhov weld puddle - kom tswj tau qhov arc ruaj khov thiab txo qhov muaj feem yuav porosity.

Thaum vuam rau hauv qhov chaw tiaj tus thiab kab rov tav, taw tes/luag lub electrode 5 deg txog 15 deg ntawm qhov kev taw qhia ntawm kev mus los kom pab txo qhov muaj feem yuav ntes tau slag hauv qhov vuam. Thaum vuam rau hauv qhov chaw ntsug-rau saum toj, taw tes/thawb lub electrode rau saum toj 3 deg txog 5 deg thaum mus rau saum toj, thiab siv cov txheej txheem me ntsis weaving los pab tiv thaiv kom tsis txhob sagging. Qhov dav ntawm lub hlaws weld feem ntau yuav tsum yog ob thiab ib nrab npaug ntawm txoj kab uas hla ntawm lub electrode lub plawv hlau rau cov vuam tiaj tus thiab kab rov tav, thiab ob thiab ib nrab txog peb npaug ntawm txoj kab uas hla ntawm lub plawv rau cov vuam ntsug-rau saum toj.

Feem ntau cov electrodes E7018 stick electrodes xa los ntawm lub chaw tsim khoom hauv lub pob kaw ruaj khov kom tiv thaiv lawv ntawm kev puas tsuaj thiab khaws cia ntawm cov dej noo. Nws yog ib qho tseem ceeb kom khaws lub pob ntawd kom zoo thiab khaws cia rau hauv qhov chaw huv si, qhuav kom txog thaum cov khoom npaj txhij rau kev siv. Thaum qhib lawm, cov electrodes stick electrodes yuav tsum tau siv nrog cov hnab looj tes huv si, qhuav kom tiv thaiv cov av thiab cov khib nyiab kom tsis txhob lo rau ntawm lub txheej thiab kom tshem tawm lub sijhawm rau cov dej noo. Cov electrodes kuj tseem yuav tsum tau khaws cia rau hauv qhov cub ntawm qhov kub uas lub chaw tsim khoom pom zoo tom qab qhib.

Qee cov lej qhia tias cov electrodes uas siv rau kev ua haujlwm ntev npaum li cas yuav tsum nyob sab nraum lub thawv ntim khoom lossis lub qhov cub cia khoom thiab seb puas tuaj yeem kho cov hlau filler kom rov zoo li qub (piv txwv li los ntawm kev ci tshwj xeeb kom tshem tawm cov dej noo uas nqus tau) ua ntej lawv yuav tsum tau muab pov tseg. Ib txwm saib cov lus qhia thiab cov lej rau cov kev cai ntawm txhua txoj haujlwm.