Lub Weldability ntawm Q275 hlau li cas?

Q275 Hlau's Weldability yog nruab nrab. Nws cov vuam kev ua tau zoo yog cuam tshuam los ntawm cov ntsiab lus carbon thiab tag nrho nws yog me ntsis} Lub zog muaj cov hlau txheem (xws li Q235). Txawm li cas los xij, weld zoo tuaj yeem lav nrog vuam tsim nyog. Cov hauv qab no yog cov ncauj lus kom ntxaws:
1. Qhov tseem ceeb rau weldability
Muaj cov ntsiab lus carbon siab
Qhov txwv ntawm cov ntsiab lus ntawm cov roj carbon rau Q275 yog 0.29% (ntau dua li 0.22% rau Q235). Carbon yog ib qho tseem ceeb cuam tshuam rau steel weldability: ntau dua li tsim cov qauv siv hluav taws xob (ua rau muaj kev cuam tshuam nrog
Cuam tshuam ntawm impurity ntsiab
Tus qauv txwv phosphorus (p) thiab Sulphur (s) rau tsawg dua lossis sib npaug rau 0.045%. Cov kev phom sij no nce cov nyiam ntawm Welds kom muaj kub tawg (Sulfur ua rau kub brittleness txias), ntxiv ntxiv kom txo weld ruaj khov. Ii. Tshwj xeeb weldability manifestations
Kev pheej hmoo siab ntawm kev tawg txias
Thaum lub sij hawm vuam, qhov kub -} be} cuam tshuam thaj chaw (Haz) yog nquag los tsim cov txheej tawv tawv vim qhov nrawm txias. Yog tias kev ntxhov siab ntawm vuam yog qhov siab lossis yog lub hauv paus hlau muaj impurities xws li cov dej noo yuav tshwm sim ze ntawm Weld (tshwj xeeb tshaj yog pom thaum muaj kev sib tw thaum kub qis).
Nruab Nrab Kub Nrov rhiab rhiab
Vim yog cov ntsiab lus siab high manganese (tsawg dua los yog sib npaug rau 1.50%), manganese tuaj yeem hnov ​​mob manganese sulfide (txo cov sulfening kub). Yog li ntawd, qhov kev pheej hmoo ntawm kub tawg yog qis dua uas ntawm siab-} sulfur hlau. Txawm li cas los xij, lub vuam tawm tswv yim lub zog yuav tsum tau tswj (piv txwv li, tsis txhob muaj kev zam dhau ntawm) kom txo qis cais.
Txo me ntsis cov khoom siv tshuab hluav taws xob ntawm Weld
Tom qab vuam, lub zog ntawm weld hlau feem ntau nyob ze rau ntawm lub hauv paus hlau, tab sis lub hauv paus yuav qis dua (vim cov nyom kev loj hlob thaum lub cav vuam). Qhov no yuav tsum tau cov txheej txheem txhim kho.
III. Txheej txheem ntsuas rau ua kom ua kom zoo nkauj vuam zoo
Pre -} vuam npaj
Clean the base metal surface from oil, rust, moisture, and other impurities to prevent impurities from entering the weld and causing porosity or cracks. For thicker (e.g., >10 hli) lossis ntau dua cov pa roj av, preheating (preheating)
Vuam Txoj Kev Xaiv
Nyiam siv qis - hydrogen franters, xws li submeren flux) los txo cov ntsiab lus hydrogen hauv weld (hydrogen yog thawj qhov ua rau muaj mob khaub thuas tawg).
Zam tsis txhob siv siab - hydrogen electrodes (xws li E4303) kom tiv thaiv kev pheej hmoo ntau.
Vuam Parameter Thaiv
Tswj lub zog vuam lub zog tawm tswv yim (tswj kom tsim nyog tam sim no, kev voltage, thiab vuam ceev). Zam kev siv hluav taws xob ntau dhau (uas yuav ua rau coarse cov nplej hauv cov cua sov- Lub zog cuam tshuam (uas yuav ua rau muaj kev txias nrawm nrawm nrawm).
Thaum siv ntau txheej txheej, tswj kev kub siab tshaj 150 qib (tsis tshaj 300 degree) thiab txo tus nqi txias. Post -} Weld Kho
Rau cov khoom tseem ceeb, kev nyuaj siab nyem annealing (kub 550-600 degree) tuaj yeem ua tom qab vuam kom tshem tawm weld kev ntxhov siab thiab txo kev pheej hmoo ntawm kev tawg.
Tom qab vuam, kom nrawm nrawm ntawm Weld Slag, soj ntsuam lub ntsej muag weld, thiab ua tsis tau} 0}} kev puas tsuaj thiab mt) yog tias tsim nyog.
IV. Siv tau cov ntawv thov thiab cov kev txwv
Siv cov ntawv thov: Haum rau vuam cov khoom siv rau nruab nrab cov rog thiab qis dua li steel cov qauv), thiab yuav tsum tau tswj cov txheej txheem steel), thiab yuav tsum tau tswj cov txheej txheem nruj.
Limitations: Not suitable for welding components with excessive thickness (e.g., >50 hli) lossis cov qauv tseem ceeb raug rau kev cuam tshuam cov khoom (xws li txuas hniav thiab cov hlab ntsha siab). Rau cov ntawv thov, tsawg {{-} alloy siab {}} lub zog hlau (xws li cov hlau steel nrog pom zoo dua weldability yog pom zoo.
Hauv cov ntsiab lus, thaum Q275's Weldability yog qis dua rau Q235, nws tsis yog "tsis muaj cai." Nrog rau kev tswj hwm ntawm preheating, vuam cov ntaub ntawv, txheej txheem tsis sib xws, thiab tshaj tawm {}}}}} pa welded qauv.