Q1: Yuav ua li cas los txiav txim siab txog qhov kub thiab txias thaum vuam Q390 steel hlau?
The preheating temperature is determined according to the wall thickness: when the wall thickness is ≤20mm, the preheating temperature is ≥100℃; when the wall thickness is 20-40mm, the preheating temperature is 120-150℃; when the wall thickness is >40mm, lub qhov kub ua ntej yog loj dua los yog sib npaug rau 150 degree. Thaum lub ambient kub yog qis dua 5 degree, lub ntsuas kub preheating yuav tsum tau nce ntxiv los ntawm lwm qhov ntxiv 20-30 degree. Cov preheating ntau yuav tsum npog thaj tsam ntawm 3 zaug ntawm lub phaj tuab ntawm ob sab ntawm Weld (tsawg kawg 100mm). Siv cov hluav taws xob cua kub lossis hluav taws xob nrog rau cov cua sov niaj hnub, thiab infrared thermometers los soj ntsuam qhov kub. Tus interlayer kub yog tswj tau hauv qab no 200-250℃kom tsis txhob muaj kev ua phem rau kev ua haujlwm hauv thaj chaw overheating.
Q2: Yuav ua li cas cov ntaub ntawv vuam tau pom zoo rau vuam Q390 kav dej?
Che557 (-30℃cuam tshuam lub zog loj dua los yog sib npaug ntawm 47j) yog qhov kev xaiv vuam, thiab nws yog siv tom qab ziab ntawm 350℃× 1h. Rau submerged arc vuam, sj 101+ s3 vuam hlau (muaj mo thiab ni) yog siv los txhim kho lub zog ntawm Weld. ER80S-G (80% Ar +20}% COG) COG FASTED RAU COV RAWS LI COV ROJ NTSUAM Cov ntsiab lus dej ntawm flux yuav tsum tsawg dua los yog sib npaug rau 0,1%, thiab cov neeg Sulphur cov ntsiab lus ntawm lub vuam hlau yuav tsum tsawg dua lossis sib npaug nrog 0.008%. Cov txheej txheem tseem ceeb vuam yuav tsum muaj cov txheej txheem tsim nyog ua haujlwm kom paub tseeb cov khoom sib piv.
Q3: Yuav ua li cas kom tsis txhob txias tawg nyob rau hauv Q390 steel yeeb nkab vuam?
Nrawm tswj cov diffrouse cov ntsiab lus hydrogen tsawg dua los yog sib npaug nrog 5ml / 100g) thiab siv ultra-tsawg hydrogen vuam cov ntaub ntawv. Nruj me ntsis ua kom preheating thiab interlayer kub yuav tsum tau tiv thaiv kom txias txias los ntawm kev sib nqus. Cov cua sov tom qab (250-300℃× 2h) yog ua tam sim ntawd tom qab vuam los txhawb kev khiav tawm ntawm hydrogen khiav dim. Tsawg-zog txuam kev vuam cov ntaub ntawv (xws li E7015) yog siv rau kev sim siab (MT)
Q4: Cov ntsiab lus tseem ceeb rau vuam Q390 nrog cov hlau sib cais (xws li 304 stainless hlau)?
Nickel-raws Vuam cov ntaub ntawv (xws li enicrmo-3) yog siv rau txheej hloov, thiab cov tuab tuab yog loj dua los yog sib npaug rau 5 hli los thaiv cov pa hluav taws. Lub zoom zoom zawj ntawm Q390 yog nce rau 75 qib los txo cov diluute tus nqi ntawm stainless hlau. Cov lus tawm thaum tshav kub yog tswj tau thaum 10-15KJ / cm kom tsis txhob emgrittlement ntawm cheeb tsam fustion. Maj mam txias rau chav kub tom qab vuam, thiab dej quenching raug txwv. Tom qab RT nrhiav kom tau, microhardness ntsuas (tsawg dua los yog sib npaug rau 350hv10) tau ua rau kab fusion.
Q5: Cov kev xav tau tshwj xeeb rau kev ntsuas vuam ntawm Q390 kav dej?
Qhov cuam tshuam hnoos qeev yuav tsum muaj peb qhov chaw: weld, fusion kab {{mm mm mm tshav kub-cuam tshuam cheeb tsam. Qhov ntsuas kub yog 20℃qis dua qhov tsim qauv kub (yog tias siv ntawm -20 degree, -40℃cuam tshuam yog ua). Kev twv cov ntawv khoov rau sab nraud (thaum t qis dua los yog sib npaug rau 38mm), thiab tus dabtsi yog cov tub ntxhais lub taub yog 4t. Lub hardness ntsuas yuav tsum tau siv Weld yuav tsawg dua lossis sib npaug ntawm 280HV10 thiab thaj chaw kub-cuam tshuam los yog sib npaug ntawm 350hv10. Cov txheej txheem tsim nyog yuav tsum tau npog txhua txoj haujlwm vuam (tshwj xeeb yog 6g txoj haujlwm).
