Qhov kev ntxhov siab nyob ntawm LSAW yeeb nkab feem ntau yog tshwm sim los ntawm qhov tsis sib xws.Residual stress yog lub internal self-theem equilibrium stress uas tsis muaj sab nraud quab yuam.Qhov kev ntxhov siab seem no muaj nyob hauv cov khoom kub dov ntawm ntau ntu.Qhov loj dua qhov loj ntawm cov seem steel, qhov ntau dua qhov seem seem.
Txawm hais tias qhov seem ntawm kev ntxhov siab yog qhov sib npaug ntawm tus kheej, nws tseem muaj qee yam cuam tshuam rau kev ua haujlwm ntawm cov tswv cuab steel nyob rau sab nraud quab yuam.Piv txwv li, nws yuav muaj kev cuam tshuam tsis zoo rau deformation, stability thiab qaug zog.Tom qab vuam, cov khoom tsis yog xim hlau suav nrog hauv LSAW yeeb nkab yog nias rau hauv cov ntawv nyias, ua rau lamination.Tom qab ntawd lub lamination zoo heev deteriorates tensile kev ua tau zoo ntawm LSAW yeeb nkab raws li thickness kev taw qhia, thiab interlayer kua muag yuav tshwm sim thaum lub weld shrinks.Lub hauv paus strain induced los ntawm weld shrinkage feem ntau yog ob peb zaug ntawm qhov taw tes tawm los, uas yog loj dua qhov tshwm sim 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 yog zoo heev.Tsis tas li ntawd, qhov vuam seem ntawm qhov T-weld yog qhov loj, thiab cov hlau vuam feem ntau yog nyob rau hauv lub xeev ntawm peb-dimensional kev nyuaj siab, uas ua rau kom muaj kev tawg.
Cov welding seam ntawm kauv submerged arc welded yeeb nkab yog faib nyob rau hauv ib tug kauv kab, thiab cov welds ntev.Tshwj xeeb tshaj yog thaum welding nyob rau hauv dynamic tej yam kev mob, lub weld tawm ntawm txoj kev taw tes ua ntej txias, uas yog ib qho yooj yim los tsim vuam kub tawg.Cov kev taw qhia tawg yog sib npaug rau cov vuam thiab tsim ib lub kaum sab xis nrog cov yeeb nkab steel axis, feem ntau hais lus, lub kaum sab xis yog nruab nrab ntawm 30-70 °.Lub kaum sab xis no tsuas yog ua raws li lub kaum sab xis shear tsis ua haujlwm, yog li nws txoj kev khoov, tensile, compressive thiab anti-twist zog tsis zoo li LSAW yeeb nkab.Nyob rau tib lub sijhawm, vim qhov kev txwv ntawm txoj haujlwm vuam, lub eeb thiab ntses ridge vuam seam cuam tshuam rau qhov tsos.Yog li ntawd, NDT ntawm SSAW yeeb nkab welds yuav tsum tau ntxiv dag zog los xyuas kom meej qhov vuam zoo, txwv tsis pub SSAW yeeb nkab yuav tsum tsis txhob siv nyob rau hauv lub sij hawm tseem ceeb steel qauv.
Post lub sij hawm: Lub Xya hli ntuj-13-2022