Vuam compatibility: Cov hlau tuaj yeem welded siv cov fusion vuam txoj kev, xws li roj tungsten arc vuam (GTAW/TIG), roj hlau arc vuam (GMAW/MIG), thiab shielded hlau arc vuam (SMAW). Ntawm cov no, GTAW yog qhov pom zoo tshaj plaws, vim nws muab kev tswj xyuas qhov kub thiab txias thiab txo qhov kev pheej hmoo ntawm cov hlau sib kis.
Ua ntej-vuam ceev faj:
Ntxuav: Lub hauv paus hlau nto li ntawm 25-50 hli ntawm qhov sib txuas yuav tsum tau muab ntxuav kom huv si kom tshem tau cov roj, roj, oxide nplai, thiab lwm yam khoom paug. Txhua qhov seem sulfur lossis chloride impurities tuaj yeem ua rau weld tawg lossis embrittlement.
Preheating: Unlike carbon steels, Incoloy 925 generally does not require preheating for thin-walled components (≤ 12 mm). For thick-walled parts (>12 mm), qhov qis -kub preheat ntawm 100–150℃(212–302℃F) yog pom zoo kom txo weld cheeb tsam kub gradients thiab tiv thaiv txias tawg.
Tom qab- kev kho vuam:
Kev nyuaj siab nyem annealing: Tom qab vuam, kev ntxhov siab annealing ntawm 620-650℃(1148-1202℃F) rau 2-4 teev yog qhov tseem ceeb. Cov kauj ruam no txo cov seem welding kev nyuaj siab thiab tsis txhob cuam tshuam intergranular los ntawm kev ntxhov siab concentration.
Kev laus kev kho mob: Yog tias cov khoom siv welded xav tau lub zog siab, kev kho cov laus tom qab ntawm 700-720℃(1292-1328℃F) rau 8 teev (tom qab cua txias) tuaj yeem rov ua kom cov nag lossis daus ntxiv ntawm cov hlau, vim tias vuam cov khoom siv hluav taws xob tuaj yeem yaj 'theem nyob rau hauv tshav kub- cuam tshuam cheeb tsam (HAZ).
Cov kev txwv tseem ceeb: Vuam yuav tsum tau zam thaum lub alloy nyob rau hauv tag nrho cov hnub nyoog, raws li cov ntxhib ntxiv dag zog rau theem nyob rau hauv lub xeev no yuav ua rau kom muaj kev pheej hmoo ntawm HAZ embrittlement thiab tawg. Nws yog qhov zoo dua rau vuam cov hlau hauv cov tshuaj -annealed xeev thiab ua kev laus tom qab vuam.
Kub ua haujlwm
Incoloy 925 muajzoo heev kub workabilitynyob rau hauv qhov zoo tshaj plaws kub ntau yam, uas yog lub hauv paus txheej txheem rau shaping lub alloy rau hauv forgings, daim hlau, thiab kav.
Qhov kub zoo tshaj plaws: Qhov pom zoo ua haujlwm kub kub yog 950-1150℃(1742-2102℃F). Hauv qab 900℃(1652℃F), alloy lub zog nce ntau, ua rau muaj kev ua haujlwm siab thiab ua haujlwm nyuaj; saum toj no 1200℃(2192℃F), grain coarsening yuav tshwm sim, uas impairs lub alloy lub mechanical kev ua tau zoo.
Kev yuav tsum tau ua: Kub ua hauj lwm yuav tsum tau ua nrog txaus deformation ib pass (Ntau tshaj los yog sib npaug li 20%) kom tawg coarse nplej thiab refine lub microstructure. Tom qab ua haujlwm kub, cov hlau yuav tsum tau txias sai heev (cua txias lossis dej quenching) txhawm rau txhawm rau nag lossis daus ntawm nkig theem thiab npaj rau kev kho mob tom ntej.
Kev ua haujlwm txias
Incoloy 925 muajkev ua haujlwm txias txias, uas yog tsim rau kev tsim cov txheej txheem xws li khoov, kos duab, thiab stamping.
Kev kho mob ua ntej: Kev ua haujlwm txias yuav tsum yog raws li kev daws teeb meem -annealed lub xeev ntawm cov hlau, vim lub xeev no muaj qhov qis tshaj plaws hardness thiab qhov zoo tshaj plaws ductility.
Nruab nrab annealing: Thaum qhov txias deformation ntau tshaj 15-20%, intermediate annealing ntawm 900-950℃(1652-1742℃F) rau 1-2 teev yuav tsum tau tshem tawm kev ua hauj lwm hardening, restore ductility, thiab tsis txhob tawg thaum lub sij hawm tom ntej ua.
Cov kev ceev faj: Tsis txhob txias deformation ntau dhau, vim qhov no yuav ua rau kev ua haujlwm hnyav hnyav thiab txo cov alloy lub toughness. Tom qab ua haujlwm txias, tag nrho cov tshuaj annealing + aging kho yog xav tau los kho cov alloy lub hom phiaj txhua yam khoom.
2.Yuav ua li cas yuav tsum tau sau tseg thaum lub sij hawm tsim khoom?
Kev tswj kev kis kab mob: Thaum lub sij hawm tag nrho cov kauj ruam ua, tsis txhob sib cuag nrog sulfur, txhuas, thiab tsawg- melting- taw tes hlau, vim hais tias cov ntsiab lus no yuav ua rau embrittlement ntawm Incoloy 925.
Kev kho cua sov: Tshuaj annealing thiab aging yuav tsum tau nqa tawm nyob rau hauv ib tug huv si, qhuav qhov chaw (xws li, purified argon los yog nqus tsev vacuum) los tiv thaiv oxidation thiab carburization ntawm alloy nto.
Kev xaiv cuab yeej: Siv siab -hardness, hnav- cov cuab yeej tiv taus (xws li, cov cuab yeej cemented carbide) rau kev ua haujlwm, thiab txais yuav tsawg txiav ceev thiab txaus coolant kom tsis txhob overheating ntawm lub workpiece.
Kev tshuaj xyuas tom qab ua tiav: Ua tsis yog -kev kuaj kev puas tsuaj (NDT) xws li ultrasonic testing (UT) thiab dye penetrant testing (PT) ntawm cov khoom tseem ceeb txhawm rau txheeb xyuas cov teeb meem sab hauv lossis cov kab nrib pleb uas tshwm sim los ntawm kev ua tsis raug.
