A. Vuam nyuaj ntawm Inconel 625
Inconel 625 raug cais raws li cov nickel weldable-raws li superalloy, tab sis nws yuav tsum tau ua raws li kev ua raws cai nruj kom tsis txhob muaj qhov tsis xws luag. Nws qhov nyuaj vuam yog nruab nrab- qis dua qee qhov nag lossis daus- cov hlau tsis muaj zog tab sis siab dua cov pa austenitic stainless hlau.
Cov kev sib tw tseem ceeb hauv Vuam
Susceptibility rau Kub Cracking
Cov alloy muaj cov ntsiab lus siab ntawm Nb thiab Mo, uas ua rau kom cov viscosity ntawm lub pas dej molten weld thiab txo nws cov fluidity. Qhov no tuaj yeem ua rau cov khoom tawg yooj yim yog tias qhov vuam ceev nrawm dhau los yog cov khoom siv hluav taws xob tsis txaus, vim tias qhov qis - cov hlau tsis muaj dej tsis tuaj yeem ua rau qhov sib txawv ntawm cov nplej thaum lub sij hawm solidification.
Sensitization thiab Intergranular Corrosion Risk
Kev siv hluav taws xob ntau dhau thaum lub vuam tuaj yeem ua rau nag lossis daus ntawm chromium carbides (Cr₂₃C₆) raws cov ciam teb hauv tshav kub- cuam tshuam thaj chaw (HAZ), depleting chromium nyob rau hauv cov matrix uas nyob ib sab thiab txo cov intergranular corrosion kuj.
Porosity tsim
Inconel 625 yog rhiab heev rau cov kab mob xws li hydrogen, oxygen, thiab nitrogen. Moisture, roj, los yog oxides ntawm lub hauv paus hlau los yog muab tub lim hlau nto tuaj yeem ua rau porosity nyob rau hauv weld hlaws.
Pom zoo Vuam xyaum ua kom txo tau qhov nyuaj
Cov txheej txheem vuam: Gas Tungsten Arc Vuam (GTAW/TIG) thiab Gas Hlau Arc Vuam (GMAW/MIG) yog cov txheej txheem siv ntau tshaj plaws, raws li lawv muaj kev tswj xyuas meej ntawm cov khoom siv hluav taws xob. Shielded Hlau Arc Vuam (SMAW) kuj tseem siv tau rau kev kho qhov chaw.
Filler Metals: Sib piv cov khoom siv hlau xws li ERNiCrMo-3 (GTAW/MIG) thiab ENiCrMo-3 (SMAW) raug pom zoo los xyuas kom muaj kev sib raug zoo hauv cov khoom siv kho tshuab thiab kev tiv thaiv corrosion.
Ua ntej-weld thiab Post-weld Treatments: Ua ntej- ntxuav lub hauv paus hlau kom tshem tawm cov roj, roj, thiab oxides; txwv cov cua kub nkag mus rau 15-25 kJ / cm3; zam ntau- hla vuam yam tsis muaj cua txias nruab nrab; thiab ua tom qab-weld annealing (yog tias xav tau) ntawm 925-1040℃kom yaj cov carbide precipitated thiab rov ua haujlwm corrosion.
B. Machining nyuaj ntawm Inconel 625
Inconel 625 yog ib qho nyuaj -rau- tshuab alloy, ntsuas qhov nyuaj vim yog cov khoom siv hauv qab no:
Ntsiab Machining Challenges
High Work Hardening Tendency
Lub alloy muaj zog ua hauj lwm hnyav thaum lub sij hawm machining - tej yam yas deformation ntawm txheej saum npoo los ntawm cov cuab yeej txiav yuav ua rau kom cov hardness ntawm qhov deformed sai heev (txog 2-3 npaug ntawm lub hauv paus hardness). Qhov no ua rau cov cuab yeej siv ceev ceev, vim tias qhov kev txiav tom ntej yuav tsum tau siv lub tshuab tawv tawv dua li cov khoom qub.
Tsawg Thermal conductivity
Inconel 625 muaj cov thermal conductivity tsuas yog ib qho -peb ntawm carbon steel. Thaum lub sij hawm machining, lub tshav kub tsim los ntawm kev txiav tsis tuaj yeem dissipated zoo, tsub zuj zuj ntawm cov cuab yeej -chip interface thiab ua rau kub siab (txog 1000 degree). Qhov no ua kom cov cuab yeej hnav, ntug chipping, thiab txawm tias lub cuab yeej tsis ua haujlwm.
Siab txiav quab yuam
Cov kev daws teeb meem ntxiv dag zog los ntawm Mo thiab Nb muab cov alloy siab tensile lub zog thiab toughness, yuav tsum tau siab dua txiav quab yuam piv rau stainless hlau. Qhov no ua rau muaj kev xav tau ntau dua ntawm kev nruj ntawm cov khoom siv machining thiab cov cuab yeej tuav.
Pom zoo Machining xyaum kom txo tau qhov nyuaj
Cov cuab yeej txiav: Siv cov cuab yeej cemented carbide nrog hnav- cov coatings resistant (xws li TiN, TiCN, TiAlN) los yog polycrystalline cubic boron nitride (PCBN) cov cuab yeej rau siab - ceev machining. Tsis txhob siab -cov cuab yeej steel ceev (HSS), vim lawv hnav sai sai.
Machining Parameters: Txais kev txiav qis qis (50-100 m / min rau roughing, 100-150 m / min rau kev ua tiav), siab pub tus nqi, thiab nruab nrab qhov tob ntawm kev txiav. Txo cov cuab yeej nyob twj ywm lub sij hawm ntawm lub workpiece kom txo tau kev ua hauj lwm hardening.
Coolant thiab Lubrication: Siv siab - lub tshuab ua kom txias txias nrog cov kua sulfurized lossis chlorinated txiav los txhim kho cov cua sov thiab txo kev sib txhuam ntawm cov cuab yeej thiab cov khoom ua haujlwm.
Machining Strategy: Ua lub teeb, tsis tu ncua txiav es tsis txhob hnyav, ntu ntu; tuav cov cuab yeej ntse txhua lub sijhawm; thiab tsis txhob recutting qhov chaw ua hauj lwm - hardened nto txheej.
