Welders thiab fabricators feem ntau sib cav tswv yim seb Q460NH Corten Steel xav tau kev tshaj tawm -weld heat treatment (PWHT)- nws lub zog siab ua rau qee qhov overdo nws, nkim sij hawm thiab nqi, thaum lwm tus hla nws tag nrho, pheej hmoo weld brittleness los yog structural tsis ua hauj lwm. Raws li qhov siab -lub zog Corten Steel (yield zog Ntau dua lossis sib npaug ntawm 460MPa), Q460NH muaj cov yam ntxwv vuam tshwj xeeb, tab sis PWHT tsis yog ib qho - loj- haum- txhua qhov yuav tsum tau ua. Yog li, thaum twg PWHT tsim nyog rau Q460NH, thiab thaum twg nws tuaj yeem hla? Lub ntsiab lus teb yog qhov tseeb:Q460NH tsis xav tau tom qab-welding cua sov kho nyob rau hauv feem ntau welding scenarios; Nws tsuas yog tsim nyog rau cov phaj tuab, siab - kev ntxhov siab welds, lossis qis - qhov kub thiab txias - nws lub zog muaj zog tab sis tsis tswj hwm kev kho cua sov thoob ntiaj teb. Hauv qab no yog cov lus qhia yooj yim, ua tau zoo.
PWHT yog dab tsi (Qhov yooj yim rau kev siv)
Koj tsis xav tau cov lus piav qhia nyuaj kom nkag siab txog PWHT lub hom phiaj rau Q460NH: Nws yog cov txheej txheem tswj cua sov thiab cua txias uas tso tawm qhov kev ntxhov siab hauv vuam, tiv thaiv cov kab mob khaub thuas, thiab txhim kho qhov tawv tawv ntawm cov vuam thiab cua sov- thaj chaw cuam tshuam (HAZ). Rau siab -lub zog steels zoo li Q460NH, cov txheej txheem no pab tswj cov kev ntseeg tau ntawm vuam-tab sis nws tsis tas yuav tsum tau ua.
Thaum PWHT yog MANDATORY (3 Qhov Tseem Ceeb Scenario)
Tsis txhob hla PWHT hauv cov xwm txheej no-Q460NH lub zog siab ua rau muaj kev ntxhov siab, ua rau muaj kev pheej hmoo tawg:
Phaj tuab (＞ 40mm): Q460NH daim hlau thicker dua 40mm sib sau cov vuam tseem ceeb; PWHT yuav tsum tau tso tawm kev ntxhov siab thiab zam kev tawg tawg.
Siab -Stress Weld Joints: Cov txheej txheem tsis yooj yim, cov phaj tuab sib tshooj, lossis cov welds bearing hnyav ntev - lub sij hawm thauj khoom (xws li, kev txhawb nqa choj, cov khoom siv hauv tsev) xav tau PWHT kom ruaj khov.
Tsawg- Kub Vuam (＜10 degree): Txias ib puag ncig ua rau cov weld brittleness; PWHT rov ua kom tawv thiab txo qhov kev pheej hmoo tawg rau Q460NH siab - lub zog welds.
Thaum PWHT tsis tsim nyog (Feem ntau Scenarios)
Txuag lub sij hawm thiab cov peev txheej- hla PWHT hauv cov teeb meem no tsawg-, raws li Q460NH qhov muaj zog toughness txaus:
Nyias mus rau nruab nrab daim hlau (tsawg dua los yog sib npaug li 40mm): Daim hlau nyob rau hauv no ntau dissipate vuam kev nyuaj siab lawm; tsis xav tau kev kho cua sov ntxiv.
Yooj yim Weld Joints: Lub pob tw los yog fillet welds (piv txwv li, lub teeb guardrails, hniav thav duab) uas tsis muaj siab - kev nyuaj siab.
Vuam nyob rau hauv Ambient Kub (10-25 degree): Qhov kub ib txwm txo qhov kev ntxhov siab ntawm vuam thiab brittleness, tshem tawm qhov xav tau ntawm PWHT.
Tswv yim PWHT (Yog xav tau)
Yog tias koj qhov project xav tau PWHT rau Q460NH, ua raws li cov qauv no, yooj yim -rau- ua raws li cov lus qhia:
Kub: Kub rau 550-600℃(siv lub ntsuas kub)-tsis txhob overheating (＞600 degree), uas tsis muaj zog Q460NH lub zog siab.
Cua sov / Txias tus nqi: Kub sib npaug (100℃/ teev max) thiab txias maj mam (natural cua txias) kom tsis txhob muaj kev ntxhov siab tshiab.
Duration: Tuav lub hom phiaj kub rau 1-2 teev (ntev rau cov phaj tuab, piv txwv li, 2 teev rau 60mm daim hlau).
