NDE yog dab tsi?
Kev ntsuam xyuas tsis ua puas tsuaj (NDE) yog ib lo lus uas feem ntau siv hloov pauv nrog NDT. Txawm li cas los xij, kev siv tshuab, NDE yog siv los piav qhia txog kev ntsuas uas muaj ntau yam ntau dua. Piv txwv li, txoj kev NDE tsis yog tsuas yog nrhiav qhov tsis zoo xwb, tab sis nws kuj tseem yuav siv los ntsuas qee yam txog qhov tsis zoo ntawd xws li nws qhov loj me, cov duab, thiab kev taw qhia. NDE tuaj yeem siv los txiav txim siab cov khoom siv, xws li kev tawg, kev ua tau zoo, thiab lwm yam ntxwv ntawm lub cev.
Qee cov thev naus laus zis NDT / NDE:
Muaj ntau tus neeg twb paub txog qee cov thev naus laus zis uas siv rau hauv NDT thiab NDE los ntawm lawv cov kev siv hauv kev lag luam kho mob. Cov neeg feem coob kuj tau thaij duab X-ray thiab ntau tus niam tau siv ultrasound uas cov kws kho mob siv los kuaj xyuas lawv tus menyuam thaum tseem nyob hauv plab. X-rays thiab ultrasound tsuas yog ob peb yam thev naus laus zis siv hauv NDT / NDE. Tus lej ntawm cov txheej txheem tshuaj xyuas zoo li nce ntxiv txhua hnub, tab sis cov ntsiab lus luv luv ntawm cov txheej txheem siv feem ntau tau muab rau hauv qab no.
Kev Ntsuas Pom Kev thiab Kev Pom Kev (VT)
Txoj kev kuaj NDT yooj yim tshaj plaws yog kev kuaj pom. Cov neeg kuaj pom ua raws li cov txheej txheem uas suav nrog kev saib ib feem kom pom seb puas pom qhov tsis zoo ntawm qhov chaw, mus rau kev siv lub koob yees duab tswj hwm los paub thiab ntsuas cov yam ntxwv ntawm ib feem.
Kev thaij duab hluav taws xob (RT)
RT siv kev siv gamma- lossis X-radiation los tshuaj xyuas cov khoom thiab cov khoom qhov tsis zoo thiab cov yam ntxwv sab hauv. Lub tshuab X-ray lossis cov isotope radioactive siv ua qhov chaw ntawm kev hluav taws xob. Kev hluav taws xob raug xa mus rau ib feem thiab mus rau ntawm zaj duab xis lossis lwm yam xov xwm. Daim duab ntxoov ntxoo qhia txog cov yam ntxwv sab hauv thiab kev ruaj khov ntawm qhov khoom. Kev hloov pauv ntawm cov khoom siv tuab thiab qhov ceev tau qhia tias yog thaj chaw sib dua lossis tsaus dua ntawm zaj duab xis. Cov chaw tsaus dua hauv daim duab xoo hluav taws xob hauv qab no sawv cev rau qhov khoob sab hauv ntawm cov khoom.
Kev Ntsuas Cov Khoom Sib Nqus (MT)
Txoj kev NDT no yog ua tiav los ntawm kev ua kom muaj lub zog sib nqus hauv cov khoom siv ferromagnetic thiab tom qab ntawd muab cov hlau me me (qhuav lossis dai rau hauv kua) rau saum npoo. Cov qhov tsis zoo ntawm qhov chaw thiab ze ntawm qhov chaw tsim cov ncej sib nqus lossis ua rau lub zog sib nqus tsis zoo uas cov hlau me me raug nyiam thiab sib sau ua ke. Qhov no ua rau pom qhov tsis zoo ntawm qhov chaw ntawm cov khoom siv. Cov duab hauv qab no qhia txog ib feem ua ntej thiab tom qab kev tshuaj xyuas siv cov khoom sib nqus qhuav.
Kev Ntsuas Ultrasonic (UT)
Hauv kev kuaj ultrasonic, cov suab nrov siab raug xa mus rau hauv cov khoom siv los nrhiav qhov tsis zoo lossis nrhiav kev hloov pauv ntawm cov khoom siv. Cov txheej txheem kuaj ultrasonic feem ntau siv yog pulse echo, uas suab raug qhia rau hauv ib yam khoom kuaj thiab kev cuam tshuam (echoes) los ntawm qhov tsis zoo sab hauv lossis qhov chaw geometrical ntawm qhov chaw raug xa rov qab mus rau lub receiver. Hauv qab no yog ib qho piv txwv ntawm kev tshuaj xyuas shear wave weld. Saib qhov cim qhia txuas mus rau qhov txwv sab saud ntawm lub vijtsam. Qhov cim qhia no yog tsim los ntawm suab cuam tshuam los ntawm qhov tsis zoo hauv qhov vuam.
Kev Ntsuas Kev Nkag Mus (PT)
Cov khoom sim no raug txheej nrog cov tshuaj uas muaj cov xim pom lossis fluorescent. Cov tshuaj ntau dhau ces raug tshem tawm ntawm qhov chaw ntawm cov khoom tab sis tso nws rau hauv qhov chaw tawg. Tom qab ntawd siv tus neeg tsim khoom los rub cov khoom nkag tawm ntawm cov qhov tsis zoo. Nrog cov xim fluorescent, lub teeb ultraviolet yog siv los ua kom cov bleedout fluoresce ci ntsa iab, yog li ua rau pom qhov tsis zoo. Nrog cov xim pom, cov xim sib piv ntawm cov khoom nkag thiab tus neeg tsim khoom ua rau "bleedout" yooj yim pom. Cov cim liab hauv qab no sawv cev rau ntau qhov tsis zoo hauv cov khoom no.
EKev Ntsuas Hluav Taws Xob (ET)
Cov hluav taws xob tam sim no (eddy currents) yog tsim los ntawm cov khoom siv hluav taws xob los ntawm kev hloov pauv ntawm lub zog sib nqus. Lub zog ntawm cov hluav taws xob eddy no tuaj yeem ntsuas tau. Cov khoom tsis zoo ua rau muaj kev cuam tshuam hauv kev ntws ntawm cov hluav taws xob eddy uas ceeb toom tus neeg tshuaj xyuas kom paub txog qhov muaj qhov tsis zoo. Cov hluav taws xob eddy kuj raug cuam tshuam los ntawm kev ua hluav taws xob thiab kev sib nqus permeability ntawm cov khoom siv, uas ua rau nws muaj peev xwm txheeb xyuas qee cov khoom siv raws li cov khoom no. Tus kws kho tshuab hauv qab no tab tom tshuaj xyuas lub tis dav hlau rau qhov tsis zoo.
Kev Ntsuas Qhov Xaus (LT)
Muaj ntau txoj kev siv los nrhiav thiab nrhiav qhov xau hauv cov khoom ntim siab, cov hlab siab, thiab cov qauv. Cov xau tuaj yeem nrhiav tau los ntawm kev siv cov khoom siv mloog hluav taws xob, kev ntsuas lub ntsuas siab, cov txheej txheem nkag mus rau hauv kua thiab roj, thiab/lossis kev sim ua npuas xab npum yooj yim.
Kev Ntsuas Kev Tso Tawm Suab (AE)
Thaum cov khoom khov kho raug kev nyuaj siab, qhov tsis zoo hauv cov khoom siv tso tawm lub zog luv luv hu ua "emissions." Ib yam li kev kuaj ultrasonic, cov pa tawm suab tuaj yeem pom los ntawm cov receivers tshwj xeeb. Cov chaw tso tawm tuaj yeem soj ntsuam los ntawm kev kawm txog lawv qhov muaj zog thiab lub sijhawm tuaj txog los sau cov ntaub ntawv hais txog cov chaw ntawm lub zog, xws li lawv qhov chaw nyob.
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Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-27-2021