Q1: Yuav ua li cas cov txheej txheem kho cua sov tau thov rau Q235B Welded yeeb nkab?
A1: Peb txoj kev kho ua tshav kub yog siv: normalizing (cua sov kom haum (600 qib cua txias) muaj kev cuam tshuam nrog cua txias, thiab ua kom muaj kev cuam tshuam / tempering (rau cov kev cai tshwj xeeb). Kev ua haujlwm tshaj plaws yog feem ntau tshwm sim, ua kom cov qauv sib zog tom qab vuam. Qhov ntsuas kub raws li qhov ntsuas kub yog nyob ntawm cov yeeb nkab loj thiab cov ntawv thov npaj. Kev Kho Cua Sov kom muaj cov khoom siv kho tshuab thiab seem ruaj khov.
Q2: Ua li cas kev kho cua sov puas cuam tshuam li cas rau microstructure?
A2: Raws li-Rolled Q235b qhia ferrite-powerpite qauv nrog banding. Kev ib txwm ua cov nplauv, ntau dua cov khaub ncaws ferrite nrog covyees faib cov hlaws (feem ntau 15-25% PETLURIT). Kev ntxhov siab muab kev ntxhov siab tswj hwm cov txheej txheem uas twb muaj lawm thaum txo kev cuam tshuam. Kev kub heev tuaj yeem ua rau kev loj hlob ntawm kev loj hlob, txo qhov nyuaj. Cov nqi ua kom tsim nyog yog qhov tseem ceeb kom tsis txhob muaj theem tsis muaj peev xwm tsis muaj peev xwm cuam tshuam cov khoom.
Q3: Dab tsi yog cov tawv tawv txawv txawv hla q235b weld?
A3: Thaj chaw weld feem ntau qhia ntau dua hardness (140-180HV) vim tias nrawm txias, hloov mus rau hauv paus hlau hardness (120-150hv). Thaj chaw kub-cuam tshuam (Haz) qhia kev gradient ntawm cov txiaj ntsig no. Hardness peaks tsis pub dhau 1-2mm ntawm Weld Centerline. Tom qab kev kho cua sov txo qhov hloov pauv no, nqa Weld cheeb tsam tawv tsis pub dhau 10% ntawm cov hlau rau kev txhim kho kev pabcuam.
Q4: Yuav ua li cas microstructure cuam tshuam rau corrosion tsis kam?
A4: Finer, ntau cov khoom siv Microstration microstresures feem ntau muaj kev tiv thaiv corrosion zoo dua los ntawm kev txo cov theem ntawm cov theem. Banded cov qauv lossis cov ntsiab lus ntawm cov noob taum ntau dhau tuaj yeem tsim cov kev txhim kho corrosion. Cov kav dej num ib txwm qhia 10-15% zoo dua corrosion tsis kam tshaj li-welded cov khoom siv. Txawm li cas los xij, qhov tseem ceeb tshaj plaws tseem nto tiv thaiv (cov txheej txheem) es tsis yog Microstructure rau Q235B.
Q5: Dab tsi metallurgical kuaj xyuas seb puas tsim nyog kho cua sov?
A5: Cov kev ntsuas qauv suav nrog: Cov ntawv kuaj me me (grain loj, theem faib tawm thoob plaws Weld / Haz / hauv paus hlau, thiab cuam tshuam rau ntawm ntau qhov chaw. Cov hau kev nce qib zoo li EBSD (Electron backscatat txawv) daim ntawv qhia crystallographic kev qhia. Macro-etching qhia tawm cov kab flat thiab kev kho cov khaub ncaws. Cov txiaj ntsig yuav tsum ua tiav Astm E112 (Grain Loj) thiab cov qauv tsim nyog.
