Titaniumyog cov hlau uas muaj zog heev uas ua rau muaj kev sib raug zoo rau cov pa roj xws li oxygen, hydrogen, thiab nitrogen ntawm qhov kub thiab txias; Qhov no affinity yuav txawm ntau pronounced thaum lub vuam kub nce, tshwj xeeb tshaj yog thaum lub sij hawm titanium vuam txheej txheem. Cov kev paub dhau los tau pom tias yog tias qhov nqus thiab tawg ntawm cov pa roj xws li oxygen, hydrogen, thiab nitrogen los ntawm titanium tsis raug tswj xyuas thaum lub sijhawm vuam, nws yuav ua rau muaj teeb meem loj rau kev tsim cov titanium welded pob qij txha.
I. Kev Taw Qhia
Nyob rau hauv xyoo tas los no, nrog kev txhim kho kev lag luam-thiab tshwj xeeb nrog kev hloov kho thiab qhib kev txuas ntxiv mus ntxiv - nce - Tuam Tshoj txoj kev tsim kho kev lag luam tau ua tiav zoo heev. Nyob rau tib lub sijhawm, Tuam Tshoj kuj tau ua qhov tseem ceeb hauv kev vuam rau engineering tej yaam num xws li cov kav dej. titanium vuam yog ib hom kev vuam ntau, thiab ua kom muaj kev tswj xyuas zoo thaum lub sijhawm ua haujlwm muaj qhov cuam tshuam tseem ceeb ntawm cov xim ntawm cov titanium vuam. Muab qhov muag pom ntawm titanium weld xim, kev tshawb fawb txog kev sib raug zoo ntawm weld xim thiab weld zoo tuav qhov tseem ceeb. Nyob rau hauv cov ntaub ntawv no, tus sau tau kos raws li xyoo ntawm kev tshawb fawb thiab cov tswv yim kev paub nyob rau hauv titanium vuam zoo tswj thiab txheej txheem technology los tshawb txog kev sib raug zoo ntawm weld zoo thiab weld xim nyob rau hauv titanium vuam, nrog rau kev cia siab ntawm pab rau kev tshawb fawb nyob rau hauv daim teb no.
II. Cov nyhuv ntawm titanium cov khoom ntawm Titanium Vuam
1. Cov nyhuv ntawm Oxygen thiab Nitrogen
Oxygen thiab nitrogen yog interstitially yaj hauv titanium, ua rau lattice distortion. Qhov no ua rau muaj zog tiv thaiv deformation, nrog rau lub zog thiab hardness, tab sis txo cov yas thiab toughness. Lub xub ntiag ntawm oxygen thiab nitrogen nyob rau hauv lub weld yog undesirable thiab yuav tsum tau zam.
2. Cov nyhuv ntawm Hydrogen
Kev nce hauv hydrogen ua rau muaj kev poob qis hauv qhov cuam tshuam ntawm titanium weld hlau, thaum plasticity txo qis me ntsis; hydrides tuaj yeem ua rau brittleness hauv kev sib koom ua ke.
3. Cov nyhuv ntawm carbon
Nyob rau hauv chav tsev kub, carbon yog interstitially yaj nyob rau hauv titanium, ua kom lub zog thiab txo plasticity, tab sis tsis zoo li nrog oxygen thiab nitrogen. Thaum cov ntsiab lus ntawm cov pa roj carbon ntau tshaj qhov kev txwv ntawm solubility, nyuaj thiab nkig TiC yog tsim. TiC no faib rau hauv ib lub network -zoo li tus qauv thiab nws yooj yim rau kev tawg. Suav teb cov qauv qhia tias cov ntsiab lus carbon hauv titanium thiab nws cov alloys yuav tsum tsis pub tshaj 0.1%. Thaum lub sij hawm vuam, cov roj paug ntawm lub workpiece thiab vuam hlau tuaj yeem ua rau cov ntsiab lus carbon; Yog li ntawd, yuav tsum tau ntxuav kom huv si ua ntej vuam.
III. Kev soj ntsuam ntawm Titanium's Weldability
Titanium muaj qhov zoo weldability. Vim nws cov thermal conductivity tsawg (0.041 Cal/degree · cm·s), titanium hlau melts tsuas yog nyob rau hauv arc cheeb tsam thiab exhibits zoo fluidity; Tsis tas li ntawd, nws muaj cov coefficient tsawg ntawm thermal expansion (8.6 × 10⁻⁶ / degree, qis dua li cov pa roj carbon steel), uas ua rau muaj txiaj ntsig zoo ntawm kev sib txuas ntawm titanium hlau.
IV. Kev sib raug zoo ntawm Weld Xim thiab Vuam Zoo hauv Titanium Vuam
1. Xim hloov hauv Welds ntawm Titanium thiab Titanium Alloy Tubes thiab cov txheej txheem ntawm kev tsim kho
Qhov tsis xws luag hauv titanium thiab titanium alloy tubes thiab lawv cov txheej txheem ntawm kev tsim muaj raws li hauv qab no: Thaum lub sij hawm vuam ntawm titanium raj, argon gas shield tsim los ntawm TIG torch tsuas tuaj yeem tiv thaiv lub pas dej welding los ntawm kev puas tsuaj ntawm huab cua; nws tsis muaj kev tiv thaiv rau cov vuam thiab nws cov cheeb tsam ib puag ncig uas twb tau khov lawm tab sis nyob twj ywm ntawm qhov kub thiab txias. Txawm li cas los xij, titanium yeeb nkab welds thiab lawv cov cheeb tsam ib puag ncig hauv lub xeev no tseem muaj peev xwm nqus nitrogen thiab oxygen los ntawm huab cua. Kev nqus pa pib ntawm 400 degree, thiab nitrogen nqus pib ntawm 600 degree, thaum huab cua muaj ntau ntawm nitrogen thiab oxygen.
Raws li qib ntawm oxidation maj mam nce, xim ntawm titanium yeeb nkab weld hloov, thiab weld lub ductility txo. Nyiaj-dawb (tsis muaj oxidation); Golden daj (TiO; titanium pib nqus hydrogen ntawm kwv yees li 250 degree; me ntsis oxidation); xiav (Ti₂O₃; mob hnyav oxidation); grey (TiO₂; hnyav oxidation).
2. Qhov zoo ntawm titanium welds tuaj yeem raug soj ntsuam raws li xim ntawm lawv qhov chaw.
Kev ntsuam xyuas ntawm cov xim sib txawv thiab qib hardness ntawm titanium welds yog qhia hauv daim duab hauv qab no
(I) Kev sim tau pom tias thaum cov xim weld darkens- uas yog, raws li qib ntawm oxidation nce - lub hardness ntawm weld kuj nce. Raws li kev ntsuam xyuas los ntawm cov phooj ywg, raws li lub hardness ntawm titanium nce, cov concentration ntawm cov teeb meem tshuaj xws li oxygen thiab nitrogen nyob rau hauv lub weld nce, ho txo weld zoo.
(2) Lub weldability ntawm titanium yog ze ze rau nws cov khoom siv tshuaj thiab lub cev. Txawm li cas los xij, qhov teeb meem tseem ceeb yog qhov kub thiab txias, titanium siab reactivity ua rau nws raug rau atmospheric paug. Thaum lub sij hawm cua sov, nws cov nplej nthuav dav, thiab raws li cov welded sib koom ua ke txias, qhov no ua rau kev tsim ntawm nkig theem. Titanium muaj cov ntsiab lus melting siab heev, ncav cuag 1668 ± 10 degree, uas yuav tsum muaj zog ntau dua li vuam hlau. Nyob rau tib lub sijhawm, titanium yog tshuaj lom neeg heev thiab ua rau O thiab H tau yooj yim dua li cov hlau, ua rau muaj tshuaj lom neeg sai ntawm qhov kub siab tshaj 600 degree. Nws absorbs ntau npaum li cas ntawm H thiab O thaum ntxov li 100 degree, nrog ib tug hydrogen solubility kaum tawm txhiab lub sij hawm ntau dua li ntawm cov hlau, ua rau cov tsim ntawm titanium hydride thiab ib tug ntse poob nyob rau hauv toughness. Gaseous impurities ua rau muaj kev cuam tshuam rau cov kab nrib pleb txias thiab ncua cov kab nrib pleb, nrog rau cov rhiab heev. Yog li, qhov purity ntawm argon siv rau vuam yuav tsum tsis pub tsawg tshaj 99.99%, cov dej noo yuav tsum tsis pub tshaj 0.039%, thiab cov ntsiab lus hydrogen ntawm vuam hlau yuav tsum qis dua 0.002%. Titanium lub tshav kub hloov coefficient yog ib nrab ntawm cov hlau. Ib qho -rau- theem hloov pauv tshwm sim ntawm 882℃; ntawm qhov kub siab dua, cov nplej tau nrawm nrawm, theem-zoo li kev loj hlob, ua rau muaj kev puas tsuaj loj hauv cov khoom. Yog li ntawd, qhov kub thiab txias yuav tsum tau tswj nruj me ntsis, tshwj xeeb tshaj yog lub sijhawm nyob hauv qhov kub thiab txias thaum lub sij hawm vuam kub. Thaum kub cracking thiab intergranular cracking tsis yog teeb meem thaum vuam titanium, porosity tuaj yeem tshwm sim, tshwj xeeb tshaj yog thaum vuam + alloys.
V. Ceev faj rau Titanium Vuam
Raws li kev tshawb fawb saum toj no, cov teeb meem hauv qab no yuav tsum tau hais thaum vuam titanium:
1. Thaum lub sij hawm titanium welding txheej txheem, lub weld cheeb tsam thiab post-weld tshav kub- thaj tsam cuam tshuam yuav tsum tau nruj me ntsis tiv thaiv kom tsis txhob muaj huab cua nkag mus rau hauv weld thiab tshav kub- thaj chaw cuam tshuam, uas tuaj yeem cuam tshuam qhov weld zoo. Yog li ntawd, 99.99% ntshiab argon thiab cov ntaub thaiv npog yog qhov tseem ceeb.
2. Weld grooves yuav tsum tau machined (sib tsoo tsis tso cai);
3. Tacking yuav tsum tau zam, thiab siab - zaus arc pib yuav tsum tau siv.
4. Post-weld kev kho cua sov yuav tsum zam; yog tias tom qab- vuam cov cua sov yog tsim nyog, qhov kev kho cua sov yuav tsum qis dua 650℃.
VI. Xaus
Kev tswj xyuas zoo hauv titanium vuam muaj qhov cuam tshuam loj rau cov xim ntawm cov hlaws vuam; Nyob rau tib lub sijhawm, qhov zoo ntawm cov vuam tuaj yeem raug ntsuas raws li nws cov xim. Muaj kev sib raug zoo tseem ceeb ntawm ob yam no.
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