1. Puas yog Post-Weld Heat Treatment (PWHT) Yuav tsum tau rau Inconel 625?
Inherent Weldability thiab Mechanical Properties: Inconel 625 yog npib tsib xee-chromium-molybdenum-niobium alloy nrog weldability zoo heev. Nws cov pob qij txha muaj peev xwm khaws tau lub zog siab, toughness, thiab corrosion kuj nyob rau hauv raws li -welded lub xeev yam tsis tas yuav tsum tau kho cua sov kom rov ua tau zoo. Lub niobium nyob rau hauv cov alloy ua raws li ib tug muaj zog carbide qub, uas refines lub grain qauv ntawm weld hlau thiab tshav kub- cuam tshuam cheeb tsam (HAZ) thaum lub sij hawm solidification, tsis txhob overgrown coarsening uas yuav tsum tau kev kho cua sov rau grain refinement.
Risk of Performance Degradation los ntawm PWHT: Yog tias tom qab-weld kev kho cua sov ua haujlwm tsis raug (xws li, ntawm qhov kub siab tshaj 700℃rau lub sijhawm ntev), nws tuaj yeem ua rau nag lossis daus ntawm nkig intermetallic theem (xws li Laves theem) thiab carbides ntawm thaj tsam nplej ntawm cov weld thiab HAZ. Cov nag lossis daus no tuaj yeem txo qhov ductility, toughness, thiab corrosion kuj ntawm qhov sib koom ua ke, tshwj xeeb tshaj yog tiv thaiv kev ntxhov siab corrosion cracking (SCC) thiab pitting corrosion.
Kev zam rau cov xwm txheej tshwj xeeb: PWHT yuav raug txiav txim siab tsuas yog hauv ob qhov tsis tshua muaj:
Kev ntxhov siab rau tuab- Cov Khoom Siv Phab Ntsa: Rau cov khoom sib txuas nrog lub thickness ntau tshaj 25 hli, los yog cov khoom uas muaj qhov siab zoo li qub lossis cyclic loads hauv kev pabcuam, qhov qis -kev kho qhov kub ntxhov siab (feem ntau ntawm 590–650℃rau 1-2 teev) tuaj yeem ua tau los txo qhov seem seem. Qhov ntsuas kub no zam cov nag lossis daus ntawm cov theem teeb meem.
Lub Rooj Sib Tham Cov Qauv Kev Lag Luam nruj: Hauv qee qhov kev lag luam tshwj xeeb (xws li lub zog hluav taws xob nuclear) nrog cov qauv tsim nyog, PWHT yuav tsum tau ua raws li cov kev cai tswj hwm, tab sis cov txheej txheem yuav tsum nruj me ntsis tswj kom tsis txhob muaj kev puas tsuaj.
2. Pom zoo Hlau rau Vuam Inconel 625
Kev xaiv ntawm vuam hlau rau Inconel 625 feem ntau yog raws li kev sib xyaw ntawm cov hlau alloy cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab, kom ntseeg tau tias cov vuam sib txuas muaj qhov sib npaug corrosion tsis kam thiab siab - kub lub zog rau lub hauv paus hlau. Feem ntau pom zoo welding hlau yog categorized ua ob hom raws li cov txheej txheem vuam:
Gas Tungsten Arc Vuam (GTAW/TIG) thiab Gas Hlau Arc Vuam (GMAW/MIG)
AWS A5.14 ERNiCrMo-3: Qhov no yog thawj thiab feem ntau teev cov vuam hlau rau Inconel 625. Nws cov tshuaj muaj pes tsawg leeg yog haum rau Inconel 625 (nickel puag, ~ 21% Cr, ~ 9% Mo, ~ 3.5% Nb, Fe Tsawg dua los yog sib npaug rau cov hlau tsis sib npaug rau 5%), pitting, crevice corrosion, thiab SCC) thiab high-temperature zog raws li lub hauv paus alloy.
Daim ntawv thov Scope: Haum rau GTAW (TIG) hauv paus hla vuam thiab sau - hla vuam, nrog rau GMAW (MIG) siab- vuam siv tau rau ob qho tib si nyias thiab tuab - cov khoom siv phab ntsa. Nws yog dav siv hauv roj thiab roj, tshuaj ua haujlwm, thiab kev lag luam aerospace.
Qhov zoo: Cov dej ntws zoo heev ntawm lub pas dej welding, tsis tshua muaj tawg thaum lub sij hawm GMAW vuam, thiab cov vuam sib txuas muaj qhov tawv zoo txawm tias nyob rau hauv qhov kub thiab txias.
Submerged Arc Welding (SAW)
AWS A5.14 ENiCrMo-3: Qhov no yog qhov pom zoo welding electrode hlau rau submerged arc vuam ntawm Inconel 625, ua ke nrog nruab nrab lossis yooj yim flux (eg, AWS A5.35 FNiCrMo-3). Nws yog tsim los rau kev siv vuam hnyav (piv txwv li, tuab-walled siab hlab ntsha, offshore platform qauv) uas yuav tsum tau muaj kev ua haujlwm siab thiab kev sib sib zog nqus weld.
Qhov yuav tsum tau muaj: Lub flux yuav tsum tsis tshua muaj leej faj thiab phosphorus kom tsis txhob kub tawg nyob rau hauv cov hlau weld thiab tswj cov alloy qhov corrosion kuj.
