Vim li cas cov hlau stainless hlau uas siv FCAW ib zaug xwb thiaj tsis ua tiav kev tshuaj xyuas tas li? David Meyer thiab Rob Koltz saib ze dua rau cov laj thawj ntawm cov kev ua tsis tiav no.Getty Images
Q: Peb tab tom kho cov hlau welded scrapers hauv lub tshuab ziab khaub ncaws hauv qhov chaw ntub dej. Peb cov welds tsis tau kuaj xyuas vim yog porosity, undercuts thiab tawg welds. Peb vuam A514 rau A36 siv 0.045 ″ txoj kab uas hla, txhua qhov chaw, cored 309L, 75% Argon / 25% Carbon Dioxide roj rau kev tiv thaiv zoo dua.
Peb tau sim cov hlau carbon electrodes, tab sis cov welds tau lwj sai dhau thiab peb pom tias cov hlau stainless ua haujlwm zoo dua. Txhua qhov welds raug ua tiav rau hauv qhov chaw tiaj tus, 3/8 nti. Vim muaj kev txwv sijhawm, txhua qhov welds tau ua tiav ib zaug. Dab tsi yuav ua rau peb cov welds tsis ua haujlwm?
Feem ntau qhov txiav tsis zoo tshwm sim vim yog cov txheej txheem vuam tsis raws li qhov tau teev tseg, cov txheej txheem vuam tsis raug, lossis ob qho tib si. Peb tsis tuaj yeem tawm tswv yim txog cov txheej txheem vuam vim peb tsis paub lawv. Qhov txiav tsis zoo uas tshwm sim ntawm 1F feem ntau yog los ntawm kev ua haujlwm weld puddle ntau dhau lossis kev mus ncig ceev dhau lossis qeeb dhau.
Txij li thaum tus welder tab tom sim tso 3/8″. Qhov ua tau ntawm kev siv lub teeb ntau dhau yuav yog ib feem ntawm kev vuam ib zaug nrog cov hlau me me uas muaj cov hlau nplaum. Txawm li cas los xij, nws zoo li siv cov cuab yeej tsis raug ntawm kev ua haujlwm es tsis yog teeb meem kev siv tshuab, uas yog vim li cas.
Qhov porosity yog tshwm sim los ntawm cov khoom tsis huv hauv qhov vuam, poob lossis ntau dhau ntawm cov pa roj shielding, lossis nqus cov dej noo ntau dhau ntawm cov hlau flux-cored. Koj hais tias qhov no yog ib txoj haujlwm kho rau cov khoom ntub hauv lub tshuab ziab khaub ncaws, yog li ntawd yog tias cov vuam tsis tau ntxuav kom huv si, qhov no yuav yog qhov ua rau muaj qhov khoob.
Cov hlau filler uas koj siv yog txhua txoj haujlwm flux cored wire, cov hlau no muaj lub kaw lus khov slag sai. Qhov no yog qhov tsim nyog los txhawb lub weld puddle thaum vuam ntsug lossis saum taub hau. Qhov tsis zoo ntawm kev khov slag sai yog tias nws khov ua ntej lub pas dej vuam hauv qab nws. Yog tias cov pa roj tseem raug tso tawm, lawv feem ntau raug ntes thiab tshwm sim tom qab hauv daim ntawv ntawm cov qhov lossis cov kab mob saum npoo. Qhov no raug nthuav dav thaum vuam hauv qhov chaw tiaj tus nrog lub xov hlau me me thiab sim tso cov weld loj hauv ib qho dhau, zoo li hauv koj daim ntawv thov.
Qhov tawg ntawm qhov vuam thaum pib thiab nres ntawm qhov vuam tuaj yeem tshwm sim los ntawm ntau yam. Vim tias koj tab tom tso ib lub hlaws loj nrog cov xov hlau me me, koj yuav muaj kev sib xyaw tsis txaus (LOF) ntawm cov hauv paus ntawm qhov vuam. Qhov tawg ntawm qhov vuam yog ib qho tshwm sim ntau vim yog qhov kev ntxhov siab ntawm qhov vuam thiab LOF ntawm cov hauv paus.
Rau qhov loj ntawm cov hlau no, koj yuav tsum siv ob lossis peb zaug hla kom ua tiav 3/8 ntawm ib nti. Fillet welds, tsis muaj ib qho. Tej zaum koj yuav pom tias nws sai dua los ua peb qhov kev vuam uas tsis muaj qhov tsis zoo dua li ua ib qho kev vuam uas tsis zoo thiab tom qab ntawd yuav tsum kho nws.
Txawm li cas los xij, lwm qhov teeb meem uas yuav ua lub luag haujlwm loj dua hauv kev tawg weld yog qib tsis raug ntawm ferrite hauv qhov vuam, uas feem ntau yog qhov ua rau tawg. 309L hlau tau tsim los rau kev vuam stainless hlau rau carbon hlau es tsis yog carbon hlau rau carbon hlau. Cov tshuaj lom neeg tshwj xeeb ntawm cov khoom no kuj suav nrog qee qhov kev dilution hlau rau ob qho tib si hlau. Yog li ntawd, hauv stainless rau carbon hlau daim ntawv thov, qee cov alloys los ntawm stainless hlau pab sib npaug cov tshuaj lom neeg sib xyaw thiab tsim cov nqi txaus siab ntawm ferrite. Siv cov hlau filler nrog kwv yees li 50% ferrite, xws li 312 lossis 2209, yuav tshem tawm qhov ua tau ntawm kev tawg vim muaj cov ntsiab lus ferrite tsawg.
Txoj kev zoo tshaj plaws los muab kev tiv thaiv kev hnav zoo heev yog vuam qhov sib koom ua ke nrog cov pa roj carbon lossis stainless hlau electrode thiab tom qab ntawd ntxiv ib txheej ntawm surfacing electrode. Txawm li cas los xij, koj tau hais tias koj nyob hauv qab kev txwv sijhawm nruj heev thiab tias txhua qhov xwm txheej vuam ntau zaus tsis yog qhov teeb meem.
Sim hloov mus rau cov hlau loj dua, xws li 1/16 nti lossis loj dua. Siv cov hlau flux-cored uas muaj roj tiv thaiv yog qhov zoo tagnrho vim nws muab kev ntxuav vuam zoo dua thiab kev tiv thaiv cua zoo dua li cov hlau tsis muaj flux-cored. Txawm li cas los xij, es tsis txhob siv cov hlau txhua qhov chaw, tsuas yog cov hlau tiaj tus thiab kab rov tav tuaj yeem txo qhov porosity lossis kev taug qab kab. Koj kuj yuav tsum hloov cov hlau filler los ntawm 309L mus rau 312 lossis 2209.
WELDER, yav tas los hu ua Practical Welding Today, qhia txog cov neeg tiag tiag uas ua cov khoom uas peb siv thiab ua haujlwm nrog txhua hnub. Phau ntawv xov xwm no tau pab cov zej zog vuam hauv North America tau ntau tshaj 20 xyoo.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm The FABRICATOR, nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.
Cov ntawv xov xwm digital ntawm The Tube & Pipe Journal tam sim no nkag tau tag nrho, muab kev nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.
Txaus siab rau kev nkag mus rau tag nrho cov ntawv digital ntawm STAMPING Journal, uas muab cov kev nce qib tshiab tshaj plaws, cov kev coj ua zoo tshaj plaws thiab cov xov xwm kev lag luam rau kev lag luam hlau stamping.
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