Welders thiab engineers ua hauj lwm nrog Q550NH Corten Steel feem ntau xav paub yog tias preheating yog ib qho yuav tsum tau ua ntej vuam. Raws li qhov siab -lub zog Corten Steel (yield ntau dua lossis sib npaug ntawm 550MPa), nws yog ib qho tseem ceeb kom tsis txhob muaj qhov tsis xws luag xws li cov kab nrib pleb txias, uas tuaj yeem ua rau tsis muaj zog ntawm kev ncaj ncees. Ntau tus xav tias tag nrho cov siab -lub zog steels xav tau preheating, tab sis qhov no puas muaj tseeb rau Q550NH? Puas yog preheating nyob ntawm phaj thickness los yog vuam txoj kev, los yog nws tsis tsim nyog rau tag nrho? Lub ntsiab lus teb yog qhov tseeb:Q550NH Corten Steel tsis tas yuav tsum tau preheating rau nyias daim hlau, tab sis preheating yog qhov tseem ceeb rau cov phaj tuab- nws qhov yuav tsum tau nyob ntawm phaj thickness thiab vuam hom, tsis yog ib qho - loj- haum-txhua txoj cai. Hauv qab no yog cov lus qhia yooj yim, ua tau zoo.
Vim li cas Preheating Matters (Yooj Yim, Tsis Muaj Jargon)
Preheating ua ntej welding slows lub txias ceev ntawm Q550NH lub weld cheeb tsam. Rau siab -lub zog steel zoo li Q550NH, kev ua kom txias sai tom qab vuam ua rau muaj kev ntxhov siab sab hauv, ua rau cov kab nrib pleb txias (me me, nyuaj-rau- txheeb xyuas qhov tsis xws luag uas ua rau lub zog puas). Preheating kuj tshem tawm cov dej noo los ntawm cov hlau nto, tiv thaiv porosity hauv vuam- kom ntseeg tau tias qhov sib koom ua ke khaws Q550NH tag nrho lub zog thiab corrosion kuj.
Thaum Preheating xav tau (los ntawm Thickness & Vuam txoj kev)
Qhov kev txiav txim siab preheat yog nyob ntawm ob yam ua tau zoo- phaj thickness thiab vuam txoj kev. Ua raws li cov lus qhia no kom tsis txhob yuam kev:
Phaj Thickness ＜20mm: Tsis tas yuav tsum tau preheating
Haum rau: MIG, TIG, lossis arc vuam (feem ntau rau nyias Q550NH daim hlau).
Yog vim li cas: nyias daim hlau txias dua maj mam, thiab cov cua sov los ntawm vuam yog txaus los tiv thaiv kev ntxhov siab sab hauv. Preheating ntawm no nkim sij hawm thiab ntxiv cov nqi tsis tsim nyog.
Phaj Thickness 20-40mm: Pom zoo Preheating
Preheating kub: 80-100℃(ib yam li cua sov qhov chaw weld 50-100mm nyob ib ncig ntawm qhov sib koom ua ke).
Yog vim li cas: Cov phaj tuab khaws cov vuam qis dua thiab txias sai dua -preheating txo qhov kev ntxhov siab thiab qhov mob khaub thuas tawg.
Phaj Thickness 40mm: Yuav tsum Preheating
Preheating kub: 100-120℃(siv lub ntsuas kub los xyuas kom meej uniformity).
Yog vim li cas: Ultra- cov phaj tuab txias ceev heev, tsim kom muaj kev ntxhov siab sab hauv-preheating yog tib txoj hauv kev kom tsis txhob muaj qhov txias txias thiab ua kom cov vuam zoo.
Tswv yim Preheating tswv yim (Nqis-Nyob zoo & Yooj yim)
Siv cov cuab yeej zoo: Rau thaj chaw me me, siv lub teeb hluav taws xob propane; rau cov phiaj xwm loj lossis cov phaj tuab, siv daim pam hluav taws xob cua sov rau cov cua sov sib xws.
Tsis txhob overheating: Tshaj 150℃tuaj yeem ua rau Q550NH lub zog tsis muaj zog (tso tawm ntau dua lossis sib npaug rau 550MPa) thiab ua rau nws cov xeb puas tsuaj - tiv taus nto.
Khaws qhov kub thiab txias thaum lub sij hawm vuam: Khaws qhov chaw preheated ntawm lub hom phiaj kub kom txog thaum vuam tiav -tsis txhob cia nws txias ib nrab.
Common yuam kev kom zam
Tsis txhob hla preheating rau cov phaj tuab kom txuag tau lub sijhawm-Cov kab nrib pleb txias yuav tsis tshwm sim tam sim ntawd tab sis yuav ua rau qhov sib koom ua ke tsis muaj zog thaum lub sij hawm, ua rau kev kho nqi ntau dua lossis ua tsis tiav. Hloov chaw, tsis txhob preheat nyias daim hlau yam tsis tsim nyog- nws nkim peev txheej thiab tsis txhim kho qhov zoo ntawm vuam.
Nyob rau hauv luv luv, Q550NH Corten Steel lub preheating yuav tsum tau nyob ntawm phaj thickness: nyias daim hlau (＜20mm) yuav tsum tsis muaj preheating, thaum tuab daim hlau (Ntau tshaj los yog sib npaug zos rau 20mm) yuav tsum tau nws los tiv thaiv tsis xws luag. Los ntawm kev ua raws li txoj cai yooj yim no, koj yuav ua kom muaj zog, ruaj khov welds uas khaws Q550NH lub zog siab thiab corrosion kuj.
