Kev nyuaj thiab kev daws teeb meem hauv titanium alloy vuam
Titanium yog cov khoom siv hlau uas muaj cov cim tshuaj Ti thiab atomic tooj 22. Titanium alloy tseem yog cov khoom siv hlau tseem ceeb. Nws yog dav siv hauv aerospace, khoom siv kho mob, tshuaj lom neeg kev lag luam thiab lwm yam kev lag luam vim nws lub teeb yuag, siab zog thiab zoo corrosion kuj. Txawm li cas los xij, vim muaj cov khoom tshwj xeeb ntawm titanium alloys, muaj qee qhov kev sib tw thiab muaj peev xwm vuam tsis xws luag thaum lub vuam txheej txheem.
Vuam titanium alloys yog qhov nyuaj. Nws cov teeb meem vuam thiab qhov tsis xws luag feem ntau yog tshwm sim hauv cov hauv qab no:
Embrittlement phenomenon:
Titanium alloys yooj yim hnov mob nrog oxygen, nitrogen, hydrogen thiab lwm yam impurities nyob rau hauv qhov chaw ntawm qhov kub thiab txias, ua rau kub-kub embrittlement thiab txo cov plasticity thiab toughness ntawm welded pob qij txha. Txhawm rau kom tsis txhob embrittlement, huab cua thaum lub sij hawm vuam thiab purity ntawm cov ntaub ntawv ua tiav yuav tsum tau tswj.
Welding tawg:
Qhov tshwm sim ntawm vuam kab nrib pleb hauv titanium alloys muaj feem xyuam rau kev ntxhov siab thiab cov ntsiab lus hydrogen. Yog li ntawd, kev ntxhov siab yuav tsum tau tswj xyuas thaum lub sij hawm vuam txheej txheem kom tsis txhob overheating thiab ceev ceev ntawm cov khoom, thiab xyuas kom meej tias lub vuam cheeb tsam yog qhuav thiab huv si.
Vuam pores:
Thaum lub sij hawm vuam txheej txheem, vim yog cov tshuaj tiv thaiv ntawm titanium alloy thiab oxides, vuam pores tau yooj yim tsim, yog li txo lub zog thiab sealing ntawm lub welded ob leeg. Ua tib zoo saib xyuas cov ntsiab lus ntawm cov pa oxygen ntawm argon roj tiv thaiv thiab cov khoom siv vuam kom ntseeg tau tias qhov chaw vuam yog qhuav thiab huv si.
Txhawm rau tiv thaiv cov teeb meem saum toj no thaum lub welding, cov kev tiv thaiv tsis zoo yuav tsum tau ua.
1. Xaiv cov txheej txheem vuam tsim nyog thiab vuam hlau, thiab xaiv txoj kev vuam tsim nyog raws li cov khoom siv thiab impurities ntawm titanium alloy puag hlau.
2. Siv cov roj tiv thaiv zoo kom ntseeg tau tias qhov purity tsis tsawg dua 99.99%.
3. Ua tib zoo ntxuav thiab ua cov txheej txheem hlau thiab vuam hlau ua ntej vuam kom tsis txhob tawg thiab interlayers.
4. Thaum lub sij hawm vuam txheej txheem, kev tiv thaiv cov roj argon uas tsim nyog yuav tsum tau ua rau lub pas dej molten thiab cov cua sov cuam tshuam rau thaj tsam ntawm cov vuam kom ntseeg tau tias vuam zoo.
Kev npaj ua ntej welding:
Kev kho deg: Kev kho lub cev ntawm titanium alloy nto, nrog rau cov xuab zeb blasting, tua blasting thiab polishing, kom tshem tawm cov av thiab oxide txheej. Qhov no txhim kho qhov zoo thiab kev ntseeg siab ntawm vuam.
Kev kho tshuaj: Siv cov tshuaj xws li acids thiab alkalis kom yaj thiab tshem tawm cov av thiab oxides ntawm qhov chaw ntawm titanium alloys. Kev kho tshuaj pab txhim kho qhov zoo thiab cov yam ntxwv ntawm cov pob qij txha welded.
Ntxuav thiab qhuav: Ua kom lub vuam qhov chaw qhuav thiab huv si kom tsis txhob muaj qhov tsis xws luag xws li qhov pores. Siv cov tshuab ziab khaub ncaws los yog cov khoom siv cua sov kom raug kom muaj qhov kub thiab av noo nyob hauv qhov chaw vuam.
Feem ntau siv welding txoj kev:
Plasma arc vuam: cua sov thiab melting titanium alloys los ntawm lub zog plasma arc, feem ntau yog siv DC arc. Plasma arc vuam muaj zog ceev thiab ceev vuam ceev, thiab yog haum rau thicker titanium alloy daim hlau thiab loj vuam qhov chaw.
Gas tungsten arc vuam (GTAW welding): Ib txoj kev vuam arc uas siv cov tungsten electrode uas tsis yog-melting rau vuam. Thaum ua GTAW vuam, qhov vuam cheeb tsam yog tiv thaiv los ntawm atmospheric pa phem nrog ib tug shielding roj (feem ntau inert gases xws li argon), thiab solder (filler hlau) feem ntau yog siv tib lub sij hawm.
Hlau arc welding (MIG welding): Ib qho kev siv lub tshuab semi-automatic lossis tag nrho tsis siv neeg vuam txoj kev uas siv cov roj argon los tiv thaiv qhov chaw vuam. MIG vuam yog ib qho yooj yim rau kev khiav lag luam thiab haum rau vuam tuab titanium alloy daim hlau thiab cov khoom loj.
Tungsten arc vuam (TIG vuam): Cov tungsten electrode yog siv los tsim ib qho arc kom sov thiab yaj cov titanium alloy, thiab qhov chaw vuam yog tiv thaiv los ntawm argon roj. TIG welding muaj vuam zoo thiab tswj kev muaj peev xwm, thiab yog tsim rau nyias daim hlau thiab precision vuam.
Nqus electron beam vuam: Siv cov kab hluav taws xob los ua kom sov thiab yaj titanium alloys nyob rau hauv lub tshuab nqus tsev. Nqus electron beam welding muaj vuam ceev thiab siab weld zoo, thiab yog haum rau thicker titanium alloy structural qhov chaw.
