Ua ntej, Ti‑6Al-4V tuaj yeem ua tiav siv cov txheej txheem xws li GTAW (TIG), GMAW (MIG), plasma arc vuam, thiab electron beam vuam (EBW).Qhov kev sib tw loj tshaj plaws hauv kev vuam titanium yog nws cov tshuaj muaj zog heev ntawm qhov kub siab. Tshaj li ntawm 500 degree, titanium sai absorbs oxygen, nitrogen, thiab hydrogen los ntawm huab cua, ua rau embrittlement, nce hardness, thiab txo ductility thiab toughness. Yog li ntawd, tag nrho inert gas shielding (argon los yog helium) yuav tsum tau siv rau lub vuam pas dej ua ke, high-temperature weld cheeb tsam, thiab sab nraum qab. Nrog kev tiv thaiv thiab tu kom zoo, lub suab, tsis muaj qhov tsis xws luag tuaj yeem tsim tau tas li.
Tom ntej no, txo lub zog tom qab vuam.Nyob rau hauv cov xwm txheej zoo li-welded, lub vuam hlau thiab tshav kub-tshuaj tiv thaiv cheeb tsam (HAZ) muaj kev hloov pauv ntawm microstructural: cov qauv alpha-beta hloov mus rau hauv coarse martensite thaum lub sij hawm txias sai, ua rau muaj zog dua tab sis qis dua piv rau cov hlau puag.
Rau cov khoom siv annealed, lub zog tawm los thiab lub zog tensile ntawm qhov sib koom ua ke feem ntau yog 85% txog 95% ntawm lub hauv paus hlau.Hauv lwm lo lus, lub zog txo qis yog me me, feem ntau 5% mus rau 15%. Weld cheeb tsam qhia tau hais tias muaj zog dua tab sis qis elongation; tag nrho cov kev sib koom ua ke tseem tuaj yeem ua tau raws li cov qauv tsim.
Yog tias cov khoom siv hauv paus yog nyob rau hauv cov tshuaj kho thiab hnub nyoog (STA), cov nyhuv ntxiv dag zog poob rau hauv cov vuam thiab HAZ thaum lub sij hawm vuam, ua rau kom pom tseeb zog txo, feem ntau nyob ib ncig ntawm 15% mus rau 25%. Yog li ntawd, vuam feem ntau yog ua los ntawm cov khoom siv annealed es tsis yog cov khoom qub.
Hais txog kev kho cua sov tom qab vuam (PWHT), nws nyob ntawm qhov yuav tsum tau ua thiab daim ntawv thov:
Cov yam ntxwv tsis tseem ceeb:Rau qhov chaw uas qhov nruab nrab ductility thiab toughness tau txais, tsis xav tau kev kho cua sov tom qab vuam. As-welded zog feem ntau txaus.
Stress relief annealing:Feem ntau ua ntawm 530-590℃rau 1-2 teev. Qhov no txo qis qhov seem vuam kev nyuaj siab yam tsis muaj qhov txo qis zog, txhim kho qhov ruaj khov thiab ua haujlwm rau deformation.
Tag nrho annealing:Ua ntawm 700-800℃los kho cov ductility thiab toughness los ntawm kev hloov cov martensite rau hauv ib qho softer, ruaj khov alpha-beta qauv. Qhov no me ntsis txo lub zog tab sis zoo heev txhim kho elongation thiab cuam tshuam tsis kam.
Hauv cov ntsiab lus,Qib 5 titanium alloy muaj zoo weldability nyob rau hauv nruj inert roj shielding. Vuam ntawm annealed puag hlau ua rau lub zog me me txo ntawm 5% mus rau 15%. Kev kho cua sov tom qab vuam tsis yog qhov yuav tsum tau ua tab sis pom zoo kom txo kev ntxhov siab lossis rov ua kom cov ductility hauv cov ntawv thov kev ntseeg siab.
