Titanium alloys tau cim los ntawm qis ntom ntom, lub zog siab, thiab corrosion tsis kam. Raws li cov khoom siv tshiab,titanium alloy kavtau dav siv nyob rau hauv aerospace teb, thiab lawv feem nyob rau hauv Aeroengine kav yog nce. Tsis tas li ntawd, titanium alloy yog cov hlau nquag heev. Nws muaj kev sib raug zoo rau cov pa oxygen, hydrogen, nitrogen, thiab lwm yam gases ntawm qhov kub thiab txias, muaj peev xwm nqus tau thiab yaj cov roj, tshwj xeeb tshaj yog thaum vuam, nws lub peev xwm tshwj xeeb yog muaj zog nrog rau qhov kub thiab txias. Thaum lub sij hawm vuam, nws yog ib qho tsim nyog los tswj kev nqus thiab sib cais ntawm cov pa oxygen, hydrogen, nitrogen, thiab lwm yam gases kom tsis txhob muaj cov khoom seem, uas ua rau muaj teeb meem loj rau kev vuam.titanium alloy tubes.
Phau ntawv argon arc vuam ntawm titanium alloy kav
Weldability ntawm titanium alloy raj
|
|
(1) Embrittlement ntawm welded pob qij txha
Nyob rau hauv chav tsev kub, titanium reacts nrog oxygen los tsim ib tug ntom oxide zaj duab xis, uas ua rau nws muaj zoo tshuaj stability thiab corrosion kuj. Thaum qhov kub thiab txias, tshwj xeeb tshaj yog thaum vuam, cov tshuaj tiv thaiv ceev ntawm titanium alloy nrog oxygen, hydrogen, thiab nitrogen yog ceev heev. Thaum cov pa phem xws li oxygen, hydrogen, thiab nitrogen nkag mus rau hauv lub pas dej molten, lub plasticity, toughness, thiab xim ntawm cov welded sib koom ua ke muaj kev hloov pauv. Tshwj xeeb tshaj yog thaum qhov kub siab tshaj 882 C, cov qoob loo txoj kev loj hlob ntawm kev sib koom ua ke yog qhov hnyav, thiab cov qauv martensite yog tsim thaum txias, ua rau txo qis zog, hardness, plasticity, thiab toughness ntawm kev sib koom ua ke thiab nyiam overheating yog loj. . Qhov sib koom ua ke yog nkig heev. Yog li ntawd, thaum titanium alloy welding, lub pas dej melting, cov tee dej, thiab qhov chaw kub kub, ob qho tib si pem hauv ntej, thiab sab nraum qab, yuav tsum muaj kev tiv thaiv tag nrho thiab ntseeg tau los ntawm cov roj.
(2) Gas qhov
Ib qho pore yog qhov tsis zoo tshaj plaws hauv titanium thiabtitanium alloy kavvuam, feem ntau nyob ze ntawm fusion kab. Hydrogen yog lub ntsiab ua rau pore tsim. Thaum lub sij hawm vuam, titanium muaj peev xwm nqus tau hydrogen (muaj zog dua ntawm qhov kub thiab txias), tab sis nws cov solubility txo qis nrog qhov kub thiab txias, yog li hydrogen yaj nyob rau hauv cov kua hlau feem ntau sib sau ze ntawm fusion kab thiab tsim pores ua ntej nws khiav.
(3) Ncua cov kab nrib pleb nyob ze ntawm qhov chaw seam
Titanium alloy feem ntau ua rau tawg (ntev tawg) nyob ze ntawm qhov chaw seam rau lub sijhawm tom qab vuam. Yog vim li cas yog tias hydrogen diffuses los ntawm qhov kub-kub molten pas dej ua ke mus rau ib tug tsawg-kub kub-kub cheeb tsam. Nrog rau qhov nce ntawm hydrogen cov ntsiab lus, tus nqi ntawm TiH2 precipitated nce, lub brittleness ntawm tshav kub-cuam tshuam cheeb tsam nce, thiab cov qauv kev ntxhov siab tsim thaum lub ntim ntawm precipitated hydride expands, uas thaum kawg ua rau tawg tsim.
