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 qho chaw ntub dej.Our welds ua tsis tau tejyam kev soj ntsuam 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% Carbon Dioxide 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 thiab yog 3/8 "ntev.Vim lub sij hawm txwv, tag nrho cov welds tau ua nyob rau hauv ib lub sij hawm.Dab tsi yuav ua rau peb welds ua tsis tau tejyam?
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.Undercuts uas tshwm sim ntawm 1F feem ntau tshwm sim los ntawm kev ua haujlwm weld ntau dhau los yog nrawm dhau los yog qeeb dhau mus.
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 ntau dua li qhov teeb meem, 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 ntawm noo noo nqus ntawm flux-cored hlau.
Cov hlau muab tub lim koj siv yog tag nrho txoj hauj lwm flux cored hlau, cov hlau hom no muaj qhov ceev khov slag system.Qhov no yog tsim nyog los txhawb lub weld puddle thaum vuam vertically upwards los yog overhead.Qhov tsis zoo ntawm ceev khov slag yog tias nws solidifies ua ntej lub weld pas dej hauv qab nws.Yog hais tias cov gases tseem raug tso tawm, qhov no feem ntau yog daig thiab tshwm sim tom qab nyob rau hauv daim ntawv ntawm cov kab nrib pleb thiab pores. sim tso ib tug loj weld nyob rau hauv ib tug pass ib zaug, raws li nyob rau hauv koj daim ntawv thov.
Weld tawg thaum pib thiab nres ntawm qhov vuam tuaj yeem tshwm sim los ntawm ntau qhov laj thawj.Vim tias koj tab tom tso cov hlaws loj nrog lub taub me me, koj yuav muaj kev tsis txaus fusion (LOF) ntawm lub hauv paus ntawm weld.Weld cracking yog ib qho 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 los yog peb hla mus 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 rau ib qho tsis xws luag thiab tom qab ntawd yuav tsum 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 carbon hlau es tsis yog carbon hlau rau carbon steel.Qhov tshwj xeeb weld chemistry ntawm cov khoom no kuj siv rau hauv qee qhov kev siv hlau dilution rau ob qho tib si stainless hlau hauv cov ntaub ntawv siv hlau. tsim cov khoom siv tau zoo ntawm ferrite.Siv cov hlau muab tub lim nrog kwv yees li 50% ferrite, xws li 312 lossis 2209, yuav tshem tawm qhov muaj peev xwm 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 ntawm cov khoom siv electrode.Txawm li cas los xij, koj tau hais tias koj nyob rau hauv lub sij hawm nruj heev thiab tias txhua qhov kev sib txuas ntau dhau los ntawm cov 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 tias nws muab cov vuam zoo dua thiab kev tiv thaiv huab cua zoo dua li cov xov hlau tsis-flux-cored.Txawm li cas los xij, tsis yog txhua txoj hauj lwm xaim, tsuas yog lub tiaj thiab kab rov tav txoj hauj lwm hlau tuaj yeem txo qhov porosity 3 los yog cov kab rov tav. 2209 ib.
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.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm FABRICATOR, yooj yim nkag mus rau cov khoom lag luam muaj txiaj ntsig.
Cov ntawv digital ntawm The Tube & Pipe Journal yog tam sim no nkag mus tau yooj yim, muab kev nkag tau yooj yim rau cov khoom lag luam muaj txiaj ntsig.
Txaus siab rau kev nkag mus rau tag nrho cov ntawv luam tawm digital ntawm STAMPING Journal, uas muab cov txheej txheem thev naus laus zis tshiab, kev coj ua zoo tshaj plaws thiab xov xwm kev lag luam rau kev lag luam hlau stamping.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm Tus Fabricator en Español, nkag tau yooj yim rau kev lag luam muaj txiaj ntsig.