Cov Khoom Kub thiab Txias Ua Haujlwm Li Cas thiab Weldability ntawm Monel 400?
1. Kev ua haujlwm txias txias
Monel 400 muaj cov yam ntxwv ua haujlwm txias txias thiab yog dav siv los ntawm cov txheej txheem txias txias xws li stamping, dabtsi yog khoov, kos duab sib sib zog nqus, txias dov thiab txias taub hau.
Kev coj tus cwj pwm ua hauj lwm hardening: Cov hlau ua haujlwm ua haujlwm hnyav thaum lub caij txias deformation. Nrog rau kev ua haujlwm txias deformation, nws hardness thiab lub zog nce tsis tu ncua thaum plasticity thiab ductility txo. Rau cov khoom uas xav tau qhov txias txias deformation los yog ntau kauj ruam, kev kho mob nruab nrab annealing yog tsim nyog. Tus qauv nruab nrab annealing kub tuaj yeem tshem tawm cov kev ntxhov siab sab hauv, rov ua kom cov ductility, thiab pab ua kom txias ntxiv.
Formability: Nws muaj cov yas zoo nyob rau hauv chav tsev kub, haum rau kev tsim nyias- cov phab ntsa, cov kav dej, cov ntawv txheeb thiab cov fasteners los ntawm kev sib sau txias. Cov hlau tsis tshua muaj siab tawg thaum lub sijhawm ua haujlwm txias, tab sis cov kaum ntse ntse thiab ntau dhau ntawm ib qho kev deformation yuav tsum tau zam kom tsis txhob muaj kev tawg lossis tawg.
Deg mob: Kev ua haujlwm txias tuaj yeem ua tiav qhov du thiab meej. Kev ua haujlwm txias txias tuaj yeem ua rau me ntsis sib nqus hloov pauv, uas yog qhov hloov pauv ntawm lub cev thiab tsis cuam tshuam rau nws cov corrosion kuj.
2. Kev ua haujlwm kub
Monel 400 yog tsim rau kev ua haujlwm kub xws li kub forging, kub dov, kub extrusion thiab kub stamping, nrog rau kev pom zoo kub ua haujlwm kub ntau.
Kev ua haujlwm siab tshaj 1232∘C tuaj yeem ua rau cov nplej coarsening thiab txo cov khoom siv tshuab; Kev ua haujlwm qis dua 982 ∘C nce deformation kuj thiab ua rau muaj kev pheej hmoo ntawm kev tawg.
Cua sov thiab cua txias yuav tsum tau: Cov hlau yuav tsum tau rhuab uniformly kom tsis txhob overheating hauv zos. Nws tuaj yeem ua kom txias los ntawm cua txias lossis cua txias sai tom qab ua haujlwm kub. Kev ua kom txias qeeb hauv qhov kub thiab txias yuav tsis ua rau muaj kev puas tsuaj rau theem nag lossis daus, yog li tsis muaj qhov yuav tsum tau ua kom ceev ceev quenching.
Cov yam ntxwv ntawm deformation: Kub ua hauj lwm txo deformation kuj zoo heev. Lub alloy muaj qhov kub-kub plasticity zoo thiab tsis yooj yim rau kub tawg. Txawm li cas los xij, cov roj uas muaj sulfur-muaj roj yuav tsum tau zam thaum lub sij hawm cua sov, vim hais tias cov sulfur tuaj yeem ua rau cov qoob loo embrittlement thiab tawg ntawm qhov kub thiab txias.
3. Kev ua haujlwm vuam
Monel 400 muaj qhov zoo tshaj plaws weldability thiab tuaj yeem koom nrog cov txheej txheem vuam feem ntau, tsis muaj qhov cuam tshuam loj heev xws li kub tawg lossis porosity raws li cov txheej txheem tsim nyog.
Muaj feem xyuam welding txoj kev:Cov txheej txheem tsim nyog muaj xws li Gas Tungsten Arc Vuam (GTAW/TIG), Gas Metal Arc Vuam (GMAW/MIG), Shielded Hlau Arc Vuam (SMAW/MMA), Submerged Arc Vuam (SAW) thiab Resistance Vuam. Ntawm lawv, GTAW yog dav siv rau cov pob qij txha zoo uas yuav tsum tau muaj kev tiv thaiv corrosion zoo heev thiab qhov chaw tiav.
Filler hlau xaiv:Kev sib tw npib tsib xee-tooj liab alloy fillers raug pom zoo kom ntseeg tau tias cov hlau vuam muaj qhov sib xws, cov khoom siv dag zog thiab corrosion kuj nrog lub hauv paus hlau. Cov khoom siv zoo xws li Monel 60 (rau SMAW) thiab Monel 62 (rau GTAW / GMAW).
Kev ceev faj thaum vuam:
Preheating feem ntau tsis xav tau rau cov pa tuab tuab. Rau cov ntu tuab lossis cov pob qij txha tsis muaj zog, qhov kub thiab txias preheating mus txog 150∘C (302∘F) raug tso cai, tab sis yuav tsum zam kom tsis txhob muaj qhov kub thiab txias.
Tom qab-weld kev kho cua sov feem ntau tsis tsim nyog. Kev ntxhov siab nyem annealing tuaj yeem siv rau cov qauv nruj heev.
Ntxuav thaj chaw vuam kom huv si ua ntej vuam kom tshem tawm cov roj, roj, oxides thiab noo noo, uas pab tiv thaiv porosity thiab inclusions.
Siv cov khoom siv hluav taws xob tsawg thiab ntau dhau nqaim hlaws welding kom txo tau cov qoob loo loj hlob thiab kev ntxhov siab.
Weld Joint Properties: Ua tau zoo welded pob qij txha tuav zoo ductility thiab corrosion kuj, ze rau cov hlau puag. Lub cheeb tsam welded tsis muaj qhov pom tseeb rhiab heev lossis intergranular corrosion nyiam nyob rau hauv feem ntau txo thiab nruab nrab ib puag ncig.
