Demagnetization, raws li lub npe implies, hais txog kev tshem tawm lossis tsis muaj zog ntawm cov hlau nplaum hauv ib yam khoom. Lub hauv paus ntsiab lus tseem ceeb cuam tshuam txog kev hloov pauv ntawm cov khoom sib nqus hauv cov khoom sib nqus los ntawm kev ua haujlwm sab nraud (xws li rov qab sib nqus teb, kub siab, cuam tshuam, thiab lwm yam), yog li ua kom tsis muaj zog lossis tshem tawm cov hlau nplaum. Hauv cov khoom sib nqus, muaj ntau qhov sib nqus me me, thiab cov lus qhia ntawm lub sijhawm sib nqus ntawm cov npe no yog thawj zaug xaj, uas muab tag nrho cov khoom siv nws cov hlau nplaum. Thaum qhov kev txiav txim no raug cuam tshuam los ntawm kev ua sab nraud, cov khoom siv hlau nplaum tsis muaj zog lossis ploj mus.
Lub ntsiab yog vim li cas rau demagnetizing spirally welded steel kav yog raws li nram no:
(1) Txhim kho vuam zoo
Thaum lub sij hawm cov txheej txheem ntawm spirally welded steel kav, tshwj xeeb tshaj yog thaum lub sij hawm welding, kev siv cov welding ncaj qha tam sim no generates ib tug muaj zog magnetic teb nyob rau hauv lub vuam taub hau thiab vuam hlau cheeb tsam vim yog high tam sim no. Qhov no magnetic teb aligns lub sij hawm sib nqus ntawm cov yeeb nkab steel lub cev nrog rau sab nraud magnetic teb. Tom qab welding tiav lawm, lub magnetic teb maj mam txo mus txog rau thaum nws ploj mus, tab sis vim hysteresis, ib tug tej yam sib nqus flux ceev, hu ua residual magnetism, tseem nyob rau hauv cov yeeb nkab lub cev. Lub xub ntiag ntawm cov hlau nplaum seem tsis zoo cuam tshuam rau kev ua haujlwm vuam tom ntej, xws li cuam tshuam rau kev ruaj ntseg ntawm vuam arc, yog li txo qhov vuam zoo. Yog li, kev kho demagnetization tuaj yeem tshem tawm lossis ua kom tsis muaj zog hlau nplaum thiab txhim kho vuam zoo.
(2) Txhawm rau kom paub tseeb qhov tseeb
Residual magnetism tseem cuam tshuam rau kev tshuaj xyuas ntawm cov kav dej welded steel kav. Piv txwv li, nyob rau hauv X-ray industrial TV imaging systems, residual magnetism yuav deflect cov kev taw qhia ntawm lub electron beam nyob rau hauv daim duab intensifier, ua rau cov duab mus rau "S" zoo li distortion. Qhov kev cuam tshuam no cuam tshuam rau kev tshawb nrhiav cov txiaj ntsig ntawm ntuj tsis xws luag xws li porosity thiab slag inclusions, tshwj xeeb tshaj yog txo qhov kev kuaj pom ntawm cov kab tsis zoo xws li kev nkag tsis tiav thiab tawg. Yog li ntawd, txhawm rau xyuas qhov tseeb ntawm cov txiaj ntsig tshuaj xyuas, kev kho demagnetization yuav tsum tau ua rau cov kav dej welded steel kav.
(3) Ua kom tau raws li qhov yuav tsum tau siv
Spirally welded steel kav muaj kev siv dav hauv ntau qhov chaw lag luam, xws li roj thiab cov kav dej ntuj thiab cov qauv kev txhawb nqa rau cov tsev. Hauv cov ntawv thov no, kev ua haujlwm thiab kev ruaj ntseg ntawm cov kav hlau steel yog qhov tseem ceeb. Lub xub ntiag ntawm cov hlau nplaum seem yuav cuam tshuam rau kev ua haujlwm ntawm cov kav hlau steel, xws li txo lawv cov kev tiv thaiv corrosion thiab qaug zog. Yog li ntawd, txhawm rau ua kom tau raws li cov kev xav tau siv thiab ua kom muaj kev nyab xeeb mus ntev thiab kev ntseeg siab ntawm cov kav hlau steel, kev kho demagnetization yuav tsum tau ua rau cov kav hlau welded kav.
(4) Tshem Tawm Kev Nyab Xeeb Kev Nyab Xeeb
Hauv qee qhov chaw tshwj xeeb, xws li thaj chaw uas muaj cov hlau nplaum muaj zog lossis cov xwm txheej uas xav tau kev ntsuas siab, cov hlau nplaum seem yuav ua rau muaj kev nyab xeeb lossis kev ntsuas yuam kev. Piv txwv li, nyob rau hauv cov cheeb tsam uas muaj cov khoom siv hluav taws xob tuab, cov hlau nplaum seem yuav cuam tshuam rau kev ua haujlwm ntawm cov khoom siv hluav taws xob; Hauv cov xwm txheej uas xav tau kev ntsuas meej, cov hlau nplaum seem yuav ua rau muaj kev sib txawv ntawm qhov ntsuas ntsuas. Yog li ntawd, txhawm rau tshem tawm cov teeb meem kev nyab xeeb thiab ntsuas qhov yuam kev, kev kho demagnetization yuav tsum tau ua rau cov kav dej welded steel kav.
Hauv cov ntsiab lus, cov laj thawj rau demagnetizing spirally welded steel kav feem ntau suav nrog kev txhim kho vuam zoo, ua kom paub tseeb qhov tseeb, ua kom tau raws li qhov yuav tsum tau siv, thiab tshem tawm kev nyab xeeb. Kev kho demagnetization yog txheej txheem tseem ceeb hauv kev tsim cov kav hlau welded thiab tseem ceeb heev rau kev ua haujlwm thiab kev ruaj ntseg ntawm cov kav hlau.
