Vuam residual stress yog hais txog cov kev ntxhov siab sab hauv uas tsim los ntawm cov qauv welded vim muaj kev txwv thermal deformation thaum lub sij hawm vuam txheej txheem. Tshwj xeeb tshaj yog, thaum lub sij hawm melting, solidification, thiab txias shrinkage ntawm weld hlau, qhov tseem ceeb thermal stress yog generated los ntawm cov kev txwv, ua rau nws yog ib feem ntawm residual stress. Hauv qhov sib piv, qhov kev ntxhov siab sab hauv uas tshwm sim los ntawm kev hloov pauv hauv cov qauv metallographic thaum lub sij hawm ua kom txias yog ib qho tseem ceeb ntawm cov kev ntxhov siab uas seem. Qhov ntau dua qhov rigidity ntawm cov qauv thiab qhov siab dua qhov kev txwv, qhov ntau dua qhov kev ntxhov siab seem, thiab yog li ntawd, qhov tseem ceeb ntawm nws qhov cuam tshuam rau lub peev xwm ntawm cov txheej txheem load-bearing. Kab lus no feem ntau tham txog qhov cuam tshuam ntawm vuam seem kev nyuaj siab ntawm cov qauv.
Kev cuam tshuam ntawm Vuam Residual Stress ntawm cov qauv lossis cov khoom siv
Welding residual stress yog thawj qhov kev ntxhov siab tam sim no ntawm ntu ntu ntawm cov khoom tivthaiv txawm tias ua ntej nws dais ib qho kev thauj khoom sab nraud. Thaum lub sij hawm kev pab cuam lub neej ntawm cov khoom, cov residual stresses ua ke nrog rau kev ua hauj lwm kev nyuaj siab tshwm sim los ntawm sab nraud loads, ua rau lub thib ob deformation thiab redistribution ntawm residual kev nyuaj siab. Qhov no tsis tsuas yog txo qhov nruj thiab ruaj khov ntawm cov qauv, tab sis kuj, nyob rau hauv qhov sib xyaw ua ke ntawm kub thiab ib puag ncig, cuam tshuam rau cov qauv ntawm lub zog qaug zog, nkig tawg tsis kam, tsis kam rau kev ntxhov siab corrosion cracking, thiab high-temperature creep cracking.
Kev cuam tshuam rau cov qauv nruj
Thaum cov kev ntxhov siab ua ke los ntawm cov khoom siv sab nraud thiab cov kev ntxhov siab nyob hauv ib cheeb tsam ntawm cov qauv nce mus txog qhov taw tes tawm, cov khoom siv nyob rau hauv cheeb tsam ntawd yuav ua rau cov yas deformation hauv ib cheeb tsam thiab poob nws lub peev xwm los dais ntxiv loads, ua rau txo qis hauv qhov zoo ntawm cov khoom seem. thaj tsam thiab, yog li ntawd, qhov nruj ntawm cov qauv. Piv txwv li, nyob rau hauv cov qauv nrog longitudinal thiab transverse welds (xws li cov tav phaj welds ntawm I-beams), los yog cov uas tau undergone nplaim taws straightening, tseem ceeb residual tensile kev nyuaj siab yuav raug generated nyob rau hauv loj cross-section. Txawm hais tias qhov kev faib tawm ntawm cov kev ntxhov siab no raws li qhov ntev ntawm cov khoom siv yuav tsis nthuav dav, lawv cov kev cuam tshuam rau qhov tawv tawv tuaj yeem tseem muaj ntau. Tshwj xeeb tshaj yog rau cov kab hluav taws xob welded raug nplaim taws ncaj ncaj, tej zaum yuav muaj qhov ua kom pom tseeb ntawm qhov nruj thaum thauj khoom thiab txo qis rov qab thaum lub sij hawm thauj khoom, uas tsis tuaj yeem saib xyuas rau cov qauv uas xav tau siab rau qhov raug thiab ruaj khov.
Kev cuam tshuam rau Static Load Strength
Rau cov ntaub ntawv nkig, uas tsis tuaj yeem ua rau cov yas deformation, qhov kev ntxhov siab hauv cov khoom siv tsis tuaj yeem raug faib ua tus sib npaug thaum lub zog sab nraud nce. Cov kev ntxhov siab yuav nce mus ntxiv kom txog thaum lawv ncav cuag cov khoom siv tawm los txwv, ua rau hauv cheeb tsam tsis ua haujlwm thiab nws thiaj li ua rau tawg ntawm tag nrho cov khoom. Lub xub ntiag ntawm residual kev nyuaj siab nyob rau hauv cov ntaub ntawv nkig txo lawv lub peev xwm load-bearing, ua rau puas. Rau cov ntaub ntawv ductile, lub hav zoov ntawm triaxial tensile residual kev nyuaj siab nyob rau hauv qis-kub ib puag ncig tuaj yeem cuam tshuam qhov tshwm sim ntawm cov yas deformation, yog li txo qhov muaj peev xwm ntawm cov khoom siv.
Hauv kev xaus, welding residual stress muaj qhov cuam tshuam loj rau kev ua haujlwm ntawm cov qauv. Tsim nyog tsim thiab tswj cov txheej txheem tuaj yeem txo cov kev ntxhov siab seem, yog li txhim kho kev ntseeg tau thiab ua haujlwm ntev ntawm cov qauv welded.
Post lub sij hawm: Aug-01-2024
