Q1: Dab tsi yog qhov txheej txheem zoo tshaj plaws rau vuam Q235 steel yeeb nkab?
Rau kev tuav cov ntawv Arc Vuam (SMAW), nws raug nquahu kom siv J422 electrode (E4303), nrog ib qho tam sim no ntawm 900 ~ 1808 rau txoj taub 4.0mm. Cov kev thaiv cov vuam vuam (GMAW) siv ER50-6 Vuam hlau, co-roj flow nqi 15 ~ 20l / min, thiab voltage 22 ~ 28v. Lub vuam ceev yog tswj hwm ntawm 15 ~ 25-hli / min, thiab cov lus tawm thaum tshav kub tau txwv rau 20kj / cm kom tiv thaiv kev kub heev. Tungsten inert roj vuam (gtaw) yog pom zoo rau cov kav dej nyias nyias (Δ tsawg dua los yog sib npaug los yog sib npaug los yog sib npaug. Tag nrho Vuam yuav tsum xyuas kom meej tias cov interlayer kub yog tsawg dua los yog sib npaug rau 150℃kom zam dhau grainening.
Q2: Yuav ua li cas kom tsis txhob deformation ntawm Q235 steel yeeb nkab vuam?
Siv cov kab ntawv sib txuas ib sab, xws li ntu nraub qaum-vuam txoj kev rau cov ntawv Welds ntev (txhua ntu yog 200 ~ 300mm ntev). Rau cov kav dej loj-ntawm cov hlab loj, siv cov kev txhawb nqa sab hauv lossis clamps los kho lawv, thiab tswj qhov sib txawv mus rau 1 ~ 2 hli. Preset tus nqi rov qab los (txog 1℃~ 3 degree) ua ntej vuam los them rau shrinkage. Mem cov vuam vuam tuaj yeem siv los txo cov tswv yim tshav kub rau cov kav hlau nyias nyias (Δ tsawg dua lossis sib npaug nrog 5 hli). Mechanical correction (xws li Jack Mob Txias) lossis cua sov hauv zos (qis dua 600 tus neeg yuav tsum tau zam rau ua rau ua haujlwm tawv.
Q3: Cov ntsiab lus tseem ceeb rau kev sib tw vuam ntawm Q235 steel kav thiab stainless hlau?
309L (E309L-16) lossis 309Mol vuam cov ntaub ntawv yog nyiam, thiab lawv 23% cr-13% ni muaj pes tsawg leeg tuaj yeem ua rau cov carbon tsiv teb tsaws. Cov kev tiv tauj sab nrauv yuav tsum tau huv si ua kom huv si ua ntej vuam, thiab lub tshuab uas yog siv lub cav uas zoo nkauj ntawm 5℃kom sib npaug ntawm qhov fusion piv. Siv cov txheej txheem cua sov tsawg tus txheej txheem (xws li tig vuam) thiab tswj cov txheej kub hauv qab 100 degree. PT Nrhiav kom tau (tus dev txwv tsis pom kev pom kom zoo) yog xav tau tom qab vuam los xyuas rau thaj chaw sib tsoo. Qhov kev pabcuam kub ntawm kev tawm tsam cov pob qij txha sib npaug ntawm cov pob qij txha sib npaug
Q4: Yuav ua li cas yog qhov kev ceev faj rau cov khoov txias Q235 steel kav?
Kev ntaus nqi hluav taws xob yuav tsum tsis pub tsawg tshaj 3 zaug lub raj hlab taub hau (muaj ntau dua lossis sib npaug ntawm cov 3D) yuav tsum tau siv los tiv thaiv wrinkles. Kev Kho Annealing Kev Kho (650℃rwb thaiv tsev rau 1h) yog yuav tsum tau ua ntej los ua ntej txias. Cov yeeb nkab dabtsi yog khoov tshuab pwm yuav tsum tau ua los ntawm cracov steel nrog lub hardness nrog lub hardness ntawm hrc58 ~ 62 txhawm rau kom muaj kev sib raug zoo. Tom qab dabtsi yog khoov, sab nraud thinning tus nqi (tsawg dua los yog sib npaug rau 15% phab ntsa tuab) thiab ovality (tsawg dua los yog sib luag rau 5% d) yuav tsum tau soj ntsuam. Rau cov txheej txheem tseem ceeb, nws raug nquahu kom ua kev ntxhov siab rau kev ntxhov siab ntawm 600℃tom qab khoov.
Q5: Dab tsi yog cov nyhuv ntawm xov ua rau lub zog ntawm Q235 steel kav?
Rolled xov yog qhov zoo dua li txiav xov, thiab lawv txias ua haujlwm ua kom tawv tau tuaj yeem nce lub zog los ntawm 10% ~ 15%. Cov xov qhov tob yuav tsum tsis pub tshaj 1/3 ntawm phab ntsa tuab (xws li 3mm phab ntsa thickness thiab 1mm xov qhov tob). Taper Yeeb Xov (xws li GB / T7306) yuav tsum ua kom ntseeg tau tias qhov ntev ntev ntev yog ntau dua lossis sib npaug rau 5 hniav. Tom qab kev ua tiav, burrs yuav tsum tau muab tshem tawm thiab tshawb xyuas nrog tus mus / tsis-goosge kom tsis txhob muaj kev ntxhov siab. Rau cov ntawv thov siab (> 1mpa), nws raug nquahu kom ntxiv R0.3mm Fillet hloov pauv ntawm lub hauv paus xov.
