Vim li cas ib leeg-dhau stainless hlau welds siv FCAW tsis tu ncua kev soj ntsuam?David Meyer thiab Rob Koltz ua tib zoo saib vim li cas rau qhov ua tsis tiav.Getty Images
Q: Peb tab tom kho welded steel scrapers nyob rau hauv lub tshuab ziab khaub ncaws nyob rau hauv ib puag ncig ntub.Our welds ua tsis tau tejyam tshuaj xyuas vim porosity, undercuts thiab tawg welds.Peb weld A514 rau A36 siv 0.045 "inch, tag nrho txoj hauj lwm, cored 309L, 75% Argon / 25% Cov pa roj carbon dioxide rau kev hnav zoo dua.
Peb sim carbon steel electrodes, tab sis cov welds hnav sai heev thiab peb pom stainless hlau ua tau zoo dua.Txhua welds yog ua nyob rau hauv ib tug ca txoj hauj lwm, 3/8 nti.Vim lub sij hawm txwv, tag nrho cov welds tau ua nyob rau hauv ib lub sij hawm. puas tuaj yeem ua rau peb cov welds ua tsis tiav?
Undercut feem ntau tshwm sim vim tawm ntawm qhov tshwj xeeb welding tsis, cov txheej txheem vuam tsis raug, lossis ob qho tib si.Peb tsis tuaj yeem tawm tswv yim ntawm vuam tsis tau vim peb tsis paub lawv.Cov kev txiav tawm uas tshwm sim ntawm 1F feem ntau tshwm sim los ntawm kev ua haujlwm ntau dhau ntawm weld puddle los yog ceev heev lossis qeeb dhau mus ceev.
Txij li thaum tus welder tab tom sim tso nyiaj 3/8 ".Qhov muaj peev xwm ntawm overhandling lub teeb yuav yog ib feem lub luag hauj lwm rau ib leeg-pass fillet welding nrog me me txoj kab uas hla flux-cored hlau.Txawm li cas los xij, nws zoo nkaus li siv cov cuab yeej tsis raug ntawm kev ua haujlwm es tsis yog. ib qho teeb meem technical, uas yog vim li cas.
Porosity yog tshwm sim los ntawm impurities nyob rau hauv lub weld, poob los yog ntau tshaj ntawm shielding gas, los yog ntau dhau noo noo nqus ntawm flux-cored hlau. , qhov no tuaj yeem yog qhov laj thawj tseem ceeb ntawm cov voids.
Cov hlau muab tub lim koj siv yog tag nrho txoj hauj lwm flux cored hlau, cov hlau hom no muaj ib tug ceev freezing slag system.Qhov no yog tsim nyog los txhawb lub weld puddle thaum welding vertically upwards los yog overhead.Qhov tsis zoo ntawm ceev freezing slag yog tias nws solidifies ua ntej lub weld pas dej ua ke hauv qab nws.Yog tias cov gases tseem raug tso tawm, lawv feem ntau ua rau daig thiab tshwm tom qab hauv daim ntawv ntawm pores los yog nto worm lem.Qhov no yog magnified thaum vuam nyob rau hauv ib tug ca txoj hauj lwm nrog ib tug me me txoj kab uas hla hlau thiab sim tso ib tug loj. weld nyob rau hauv ib tug pass, raws li nyob rau hauv koj daim ntawv thov.
Weld tawg ntawm qhov pib thiab nres ntawm qhov vuam tuaj yeem tshwm sim los ntawm ntau qhov laj thawj.Vim tias koj tab tom tso ib lub hlaws loj nrog ib txoj kab me me, koj yuav muaj kev tsis txaus fusion (LOF) ntawm lub hauv paus ntawm weld. cracking yog ib qho tshwm sim tshwm sim vim muaj qhov seem ntawm cov weld siab thiab LOF ntawm cov hauv paus hniav.
Rau qhov loj ntawm cov hlau no, koj yuav tsum siv ob lossis peb hla dhau los ua kom tiav 3/8 ntawm ib nti.Fillet welds, tsis muaj leej twg.Koj yuav pom nws sai dua los ua peb qhov tsis xws luag welds dua li ua ib qho tsis xws luag thiab tom qab ntawd yuav tsum tau ua. kho nws.
Txawm li cas los xij, lwm qhov teeb meem uas tuaj yeem ua lub luag haujlwm loj dua hauv kev sib tsoo yog qhov tsis raug ntawm ferrite hauv qhov vuam, uas feem ntau yog qhov ua rau tawg.309L hlau yog tsim los rau vuam stainless hlau rau cov hlau tsis yog carbon hlau rau carbon hlau. .Qhov tshwj xeeb weld chemistry ntawm cov khoom no kuj yuav siv sij hawm rau hauv tus account qee lub hauv paus hlau dilution rau ob lub hauv paus hlau.Yog li ntawd, nyob rau hauv stainless rau carbon steel daim ntaub ntawv, ib co alloys derived los ntawm stainless hlau pab sib npaug cov tshuaj muaj pes tsawg leeg thiab tsim tau cov nqi ntawm ferrite.Sing a muab tub lim hlau nrog kwv yees li 50% ferrite, xws li 312 lossis 2209, yuav tshem tawm qhov ua tau tawg vim cov ntsiab lus ferrite tsawg.
Txoj hauv kev zoo tshaj plaws los muab kev hnav zoo tshaj plaws yog kev sib koom ua ke nrog cov qauv carbon lossis stainless hlau electrode thiab tom qab ntawd ntxiv txheej txheej ntawm cov khoom siv hluav taws xob.Txawm li cas los xij, koj tau hais tias koj tau nyob rau lub sijhawm nruj heev thiab tias txhua qhov kev sib txuas ntau dhau. qhov xwm txheej twb tawm ntawm lo lus nug.
Sim hloov mus rau txoj kab uas hla loj dua, xws li 1/16 nti lossis loj dua.Siv cov roj-shielded flux-cored hlau yog qhov zoo tagnrho vim nws muab cov vuam zoo dua thiab kev tiv thaiv huab cua zoo dua li cov xov hlau uas tsis yog flux-cored. tag nrho txoj hauj lwm hlau, tsuas yog ib tug ca thiab kab rov tav txoj hauj lwm hlau yuav txo tau porosity los yog cab mus txog qhovtwg.Koj yuav tsum tau hloov cov muab tub lim hlau los ntawm 309L mus rau 312 los yog 2209.
WELDER, yav tas los siv vuam niaj hnub no, nthuav qhia cov neeg tiag tiag uas ua cov khoom uas peb siv thiab ua haujlwm nrog txhua hnub.Cov ntawv xov xwm no tau ua haujlwm rau cov koom haum vuam hauv North America rau ntau tshaj 20 xyoo.
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