Cov kev ntxhov siab nyob ntawm lsaw yeeb nkab feem ntau yog tshwm sim los ntawm kev ua kom txias. Residual kev ntxhov siab yog sab hauv tus kheej theem sib npaug sib npaug tsis muaj lub zog sab nraud. Qhov kev ntxhov siab no muaj nyob hauv cov tshooj kub ntawm ntau cov ntu. Cov loj dua ntawm ntu loj ntawm General tshooj hlau, ntau dua qhov kev ntxhov siab ntau dua.
Txawm hais tias qhov kev ntxhov siab uas muaj kev ntxhov siab yog tus kheej sib npaug, nws tseem muaj qee yam cuam tshuam rau cov neeg hlau ua haujlwm hauv lub zog ntawm cov hlau sab nraud. Piv txwv li, nws yuav muaj kev tsis zoo tshwm sim los ntawm kev deformation, ruaj khov thiab nkees tsis kam. Tom qab vuam, qhov tsis yog xim hlau suav nrog lsaw cov yeeb nkab raug nias rau hauv cov nplooj ntawv nyias, ua rau kev lamination. Tom qab ntawd lub lamination zoo heev rau lub tensile kev ua tau zoo ntawm lsaw yeeb nkab raws cov tickness kev taw qhia, thiab cov kua muag interlayer yuav tshwm sim thaum lub weld shrinks. Lub zos lim yuam kev los ntawm Weld shrinkage feem ntau yog ob peb zaug ntawm cov paib xwm sib zog, uas loj dua li qhov ntawd los ntawm kev thauj khoom. Tsis tas li ntawd, lsaw yeeb nkab yuav inevitably muaj ntau t-welds, yog li qhov tshwm sim ntawm vuam tsis xws luag tau zoo heev. Ntxiv mus, lub vuam restidual kev ntxhov siab ntawm T-Weld yog loj, thiab Weld hlau feem ntau nyob rau hauv lub xeev ntawm peb-seem hlau, uas nce qhov tau txais kev nrib pleb.
Kev txiav tawm ntawm txoj hlua khi ntawm muab kauv submerged arc Welded yeeb nkab tau faib rau hauv ib kab kauv, thiab cov cuab yeej siv tau ntev. Tshwj xeeb tshaj yog thaum vuam nyob rau hauv kev ua neej nyob, weld tawm ntawm kev tsim cov point ua ntej txias, uas yog qhov yooj yim los tsim cov vuam kub tawg. Cov kev coj ua kom sib xws yog sib xws rau Weld thiab ua ib lub ntsej muag muaj nrog cov yeeb nkab sib txawv, feem ntau hais lus, lub kaum sab xis ntawm 30-70 °. Lub kaum ntse ntse no tsuas yog sib xws nrog shear tsis ua hauj lwm lub kaum, yog li nws khoov, pending, compressive thiab anti-twist cov khoom tsis zoo li lsaw yeeb nkab. Nyob rau tib lub sijhawm, vim qhov kev txwv ntawm txoj hauj lwm vuam, lub eeb thiab ntses ntug vuam nkhaus cuam tshuam rau cov tsos. Yog li ntawd, NDT ntawm SSAW cov yeeb nkab Welds yuav tsum muaj zog los xyuas kom cov vuam zoo, txwv tsis pub siv cov yeeb nkab ssaw, txwv tsis pub siv hauv cov qauv steel tseem ceeb.
Lub Sijhawm Post: Jul-13-2022