Lub thoob lub cev khoom ntawm wY25 excavator yog Q345, uas muaj weldability zoo. Cov khoom siv thoob cov hniav yog ZGMn13 (siab manganese steel), uas yog ib-theem austenite ntawm qhov kub thiab txias thiab muaj qhov zoo toughness thiab siab hnav tsis kam nyob rau hauv kev cuam tshuam load vim ua hauj lwm hardening ntawm txheej txheej. Tab sis qhov no steel weldability yog tsis zoo: ib tug yog nyob rau hauv lub vuam tshav kub-cuam tshuam cheeb tsam nag lossis daus ntawm carbide los ntawm cov khoom embrittlement; Qhov thib ob yog qhov vuam thermal cracking, tshwj xeeb tshaj yog nyob ze seam cheeb tsam liquefaction tawg.
1.heat-cuam tshuam cheeb tsam nag lossis daus carbide tshwm sim los ntawm embrittlement
ZGMn13 siab manganese hlau yuav precipitate carbide nyob rau hauv lub grain ciam teb thaum nws yog rhuab dua ntau tshaj 250 ℃, yog li ntawd lub toughness ntawm cov khoom yuav txo tau zoo heev thiab kev ua tau zoo ntawm high manganese hlau yog loj heev puas. Tom qab kev tsom xam, thaum lub siab manganese hlau yog rhuab dua thiab txias ceev ceev, carbide yuav xub precipitate ntawm lub grain ciam teb, thiab nrog rau ncua sij hawm nyob rau hauv lub sij hawm, lub carbide ntawm lub grain ciam yuav hloov los ntawm discontinuous particle lub xeev mus rau mesh. kev faib tawm, thiab nws cov brittleness yuav nce ntxiv. Yog li ntawd, thaum lub siab manganese hlau nyob rau hauv vuam los yog reheating tom qab welding, yuav nyob rau hauv lub vuam tshav kub-tshem tawm tsam ntawm ib feem ntawm nag lossis daus ntawm carbide mus rau qhov sib txawv degrees, thiab tej zaum yuav martensitic transformation, tsis tsuas yog ua rau cov khoom nkig, tab sis kuj. txo nws cov hnav tsis kam thiab cuam tshuam toughness. Thiab, nyob rau hauv lub tshav kub-cuam tshuam cheeb tsam yooj yim rau precipitate carbide kub ntau yam (650 ℃ los yog li ntawd) lub sij hawm nyob rau lub sij hawm ntev, qhov ntau carbide nag lossis daus.
Txhawm rau txo cov nag lossis daus ntawm carbide thiab tiv thaiv cov khoom los ntawm kev poob toughness thiab ua nkig, kev ntsuas yuav tsum tau ua kom ceev cov cua txias, uas yog, kom luv lub sijhawm nyob hauv qhov kub thiab txias. Vim li no, excavator thoob lub cev thiab thoob cov hniav vuam siv cov ntu luv vuam, sib quas ntus vuam, ntub dej vuam, thiab lwm yam.
2.Vuam thermal cracking
Tiv thaiv thermal cracking yog txo cov ntsiab lus ntawm S thiab P nyob rau hauv lub hauv paus hlau los yog weld khoom; kuj tseem tuaj yeem siv cov kev ntsuas kom txo qis kev ntxhov siab los ntawm cov txheej txheem vuam, xws li kev siv cov ntu luv vuam, sib cuam tshuam vuam, dispersion vuam thiab hammering tom qab vuam. Nyob rau hauv lub thoob lub cev overlay welding siab manganese hlau, koj tuaj yeem ua ntej weld ib txheej ntawm Cr-ni, Cr-ni-Mn lossis Cr-Mn austenitic steel rau kev sib cais vuam channel, tuaj yeem tiv thaiv kev tawg.
Excavator thoob lub cev thiab thoob cov hniav vuam txheej txheem
1.Kev npaj ua ntej vuam
Ua ntej tshaj plaws, tshem tawm cov hniav txhuam hniav los ntawm lub thoob lub cev, thiab tom qab ntawd siv lub kaum sab xis kom polish lub installation ntawm lub thoob cov hniav ntxuav, tsis muaj av nkos, xeb, thiab ua tib zoo xyuas seb puas muaj cov kab nrib pleb thiab lwm yam tsis xws luag; qhib lub bevel nrog carbon arc gas planer ntawm lub thoob cov hniav kom welded, thiab ntxuav nrog lub kaum sab xis grinder.
2. vuam
① ua ntej nyob rau hauv lub thoob lub cev (thiab lub thoob cov hniav pob qij txha) nrog GBE309-15 vuam electrodes rau overlay vuam, vuam electrodes yuav tsum yog 350 ℃, 15h ziab ua ntej vuam, vuam tam sim no yuav tsum loj, vuam ceev yog me ntsis qeeb kom ntseeg tau tias fusion zone nickel cov ntsiab lus ntawm 5% mus rau 6%, tiv thaiv cov khoom tawg-rhiab martensite.
② Ua qhov chaw vuam. Tom qab lub thoob cov hniav sib sau ua ke nyob rau hauv qhov chaw, D266 vuam pas nrig nrog ib txoj kab uas hla ntawm 32MM yog siv rau symmetrical positioning vuam ntawm ob sab, qhov ntev ntawm lub vuam tsis pub tshaj 30MM. dej txias thiab hammering tam sim ntawd tom qab vuam.
③ hauv qab vuam. Siv 32MM txoj kab uas hla D266 vuam pas nrig rau bottoming vuam. Siv tsis tshua muaj tam sim no, DC thim rov qab polarity, sib cuam tshuam vuam.
Post lub sij hawm: Aug-04-2022