Welding yog dab tsi?
Lub peev xwm vuam ntawm cov hlau yog hais txog kev hloov kho ntawm cov khoom siv hlau rau cov txheej txheem vuam, feem ntau yog hais txog qhov nyuaj ntawm kev tau txais cov pob qij txha zoo nyob rau hauv qee qhov txheej txheem vuam.Hais lus dav dav, lub tswv yim ntawm "weld peev" kuj suav nrog "muaj" thiab "kev ntseeg tau".Weld peev xwm nyob ntawm tus yam ntxwv ntawm cov khoom siv thiab cov txheej txheem siv.Weld peev xwm ntawm cov ntaub ntawv hlau tsis zoo li qub tab sis txhim kho piv txwv li, rau cov ntaub ntawv uas thaum xub thawj pom tias tsis muaj peev xwm weld, nrog kev txhim kho ntawm kev tshawb fawb thiab thev naus laus zis, cov txheej txheem vuam tshiab tau ua kom yooj yim dua rau vuam, uas yog, lub peev xwm weld. tau ua zoo dua.Yog li ntawd, peb tsis tuaj yeem tawm hauv cov txheej txheem los tham txog kev muaj peev xwm weld.
Weld peev xwm suav nrog ob yam: ib qho yog kev sib koom ua ke, uas yog, qhov kev nkag siab ntawm kev tsim cov vuam tsis xws hauv qee qhov txheej txheem vuam;Qhov thib ob yog qhov kev ua tau zoo, uas yog, kev hloov pauv ntawm kev sib koom ua ke rau kev siv raws li qee yam txheej txheem vuam.
Vuam txoj kev
1. Laser vuam(LBW)
2. Ultrasonic vuam (USW)
3. Diffusion vuam (DFW)
4.y lwm
1.Welding yog txheej txheem ntawm kev sib koom cov ntaub ntawv, feem ntau yog hlau, los ntawm cua sov ntawm qhov chaw mus rau qhov chaw ntawm melting thiab tom qab ntawd tso cai rau lawv kom txias thiab solidify, feem ntau nrog kev sib ntxiv ntawm cov khoom muab tub lim.Lub weldability ntawm cov khoom yog hais txog nws lub peev xwm los welded nyob rau hauv tej yam txheej txheem, thiab nyob ntawm cov khoom tus yam ntxwv thiab cov txheej txheem vuam siv.
2.Weldability tuaj yeem muab faib ua ob yam: kev sib koom ua ke thiab kev ua tau zoo.Kev sib koom ua ke yog hais txog qhov rhiab heev ntawm kev tsim vuam tsis xws luag nyob rau hauv qee qhov txheej txheem vuam, thaum kev ua tau zoo yog hais txog kev hloov pauv ntawm kev sib koom ua ke rau kev siv cov kev cai hauv qee qhov txheej txheem vuam.
3.Nws muaj ntau txoj kev vuam, xws li laser vuam (LBW), ultrasonic vuam (USW), thiab diffusion vuam (DFW), thiab lwm yam.Kev xaiv ntawm txoj kev vuam yog nyob ntawm cov ntaub ntawv uas tau koom nrog, qhov tuab ntawm cov ntaub ntawv, qhov yuav tsum tau muaj zog sib koom ua ke, thiab lwm yam.
Laser Vuam yog dab tsi?
Laser welding, tseem hu ua laser beam welding ("LBW"), yog cov txheej txheem hauv kev tsim khoom uas ob lossis ntau daim ntawm cov khoom (feem ntau yog hlau) tau koom ua ke los ntawm kev siv lub laser beam.
Nws yog cov txheej txheem tsis sib cuag uas yuav tsum tau nkag mus rau thaj chaw weld los ntawm ib sab ntawm cov khoom raug welded.
Lub tshav kub tsim los ntawm lub laser melts cov khoom ntawm ob sab ntawm kev sib koom tes, thiab raws li cov khoom molten sib tov thiab resolidifies, nws fuses qhov chaw.
Lub vuam yog tsim raws li lub teeb laser khaus sai sai heats cov khoom - feem ntau xam nyob rau hauv milliseconds.
Lub laser beam yog ib coherent (ib theem) lub teeb ntawm ib lub wavelength (monochromatic).Lub laser beam muaj tsawg beam divergence thiab siab zog cov ntsiab lus uas yuav tsim tshav kub thaum nws ntaus ib tug nto
Zoo li txhua hom kev vuam, cov ntsiab lus tseem ceeb thaum siv LBW.Koj tuaj yeem siv cov lasers sib txawv thiab ntau yam LBW cov txheej txheem, thiab muaj qee zaus thaum laser vuam tsis yog qhov kev xaiv zoo tshaj plaws.
Laser Vuam
Muaj 3 hom laser vuam:
1.Kev coj ua hom
2.Kev ua haujlwm / kev nkag mus rau hom
3.Penetration lossis keyhole hom
Cov hom laser vuam no yog pawg los ntawm tus nqi ntawm lub zog xa mus rau cov hlau.Xav txog cov no li qis, nruab nrab, thiab siab zog ntawm laser zog.
Hom kev coj ua
Kev coj ua hom xa cov laser tsis tshua muaj zog rau cov hlau, uas ua rau muaj kev nkag mus rau qhov qis nrog qhov ntiav ntiav.
Nws yog qhov zoo rau cov pob qij txha uas tsis xav tau lub zog siab vim tias qhov tshwm sim yog ib hom kev sib txuas txuas ntxiv.Kev siv welds yog du thiab zoo nkauj, thiab lawv feem ntau dav dua li qhov tob.
Muaj ob hom conduction hom LBW:
1. Direct Cua sov:Qhov saum npoo yog rhuab ncaj qha los ntawm lub laser.Thaum tshav kub kub yog ua nyob rau hauv cov hlau, thiab ib feem ntawm lub hauv paus hlau yaj, fusing lub sib koom tes thaum cov hlau resolidifies.
2. Kev xa hluav taws xob: Ib tus cwj mem tshwj xeeb absorbing yog thawj zaug tso rau ntawm qhov sib koom ua ke.Cov number case no siv rau hauv lub zog laser thiab ua kom sov.Cov hlau hauv qab ces ua cov cua sov rau hauv ib txheej nyias, uas melts, thiab resolidifies los ua ib qho kev sib koom ua ke.
Kev coj ua / kev nkag mus rau hom
Qee tus yuav tsis lees paub qhov no yog ib qho ntawm cov qauv.Lawv xav tias tsuas muaj ob hom;koj tog twg los ua cua sov rau hauv cov hlau los yog vaporize ib tug me me hlau channel, cia lub laser cia rau hauv cov hlau.
Tab sis hom conduction / nkag mus siv "nruab nrab" lub zog thiab ua rau muaj kev nkag mus ntau dua.Tab sis lub laser tsis muaj zog txaus rau vaporize hlau zoo li hauv hom keyhole.
Kev nkag mus lossis Keyhole hom
Hom no tsim qhov sib sib zog nqus, nqaim welds.Yog li, qee tus hu nws hom kev nkag mus.Cov welds ua tau ib txwm tob dua qhov dav thiab muaj zog dua li kev siv hom welds.
Nrog rau hom LBW vuam no, lub tshuab hluav taws xob muaj zog laser vaporizes lub hauv paus hlau, tsim kom muaj qhov nqaim hu ua "keyhole" uas txuas mus rau hauv qhov sib koom ua ke.Qhov "qhov" no muab lub raj rau lub laser nkag mus tob rau hauv cov hlau.
Haum Hlau Rau LBW
Laser vuam ua haujlwm nrog ntau cov hlau, xws li:
- Carbon Steel
- Aluminium
- Titanium
- Tsawg alloy thiab stainless hlau
- Nickel
- Platinum
- Molybdenum
Ultrasonic vuam
Ultrasonic welding (USW) yog kev sib koom lossis kev hloov pauv ntawm cov thermoplastics los ntawm kev siv cov cua sov uas tsim los ntawm cov tshuab hluav taws xob ntau zaus.Nws yog ua tiav los ntawm kev hloov cov hluav taws xob ntau zaus hluav taws xob mus rau hauv high-frequency mechanical motion.Qhov kev tawm dag zog ntawd, nrog rau kev siv quab yuam, tsim kev sib txhuam ntawm cov khoom yas 'mating chaw (chaw sib koom ua ke) yog li cov khoom yas melts thiab tsim cov molecular daim ntawv cog lus ntawm cov khoom.
BASIC PRINCIPLE OF ULTRASONIC WELDING
1.Parts nyob rau hauv Fixture: Ob lub thermoplastic qhov chaw yuav tsum tau muab tso ua ke, ib tug nyob rau sab saum toj ntawm lwm yam, nyob rau hauv ib tug txhawb nqa zes hu ua fixture.
2.Ultrasonic Horn Contact: Ib qho titanium lossis txhuas tivthaiv hu ua lub horn yog coj los rau hauv kev sib cuag nrog cov yas sab saud.
3.Force Applied: Ib lub zog tswj los yog siab yog siv rau qhov chaw, clamping lawv ua ke tiv thaiv lub fixture.
4.Weld Lub Sij Hawm: Lub horn ultrasonic vibrated vertically 20,000 (20 kHz) los yog 40,000 (40 kHz) zaug ib ob, nyob deb ntsuas nyob rau hauv txhiab ntawm ib nti (microns), rau ib tug predetermined lub sij hawm hu ua weld lub sij hawm.Los ntawm kev ua tib zoo tsim ib feem, qhov vibratory mechanical zog yog qhia rau cov ntsiab lus ntawm kev sib cuag ntawm ob qhov chaw.Cov neeg kho tshuab kev co yog kis los ntawm cov ntaub ntawv thermoplastic mus rau qhov sib koom ua ke los tsim kev sib txhuam kub.Thaum qhov kub thiab txias ntawm qhov sib koom ua ke mus txog qhov melting point, yas melts thiab ntws, thiab kev vibration yog nres.Qhov no tso cai rau cov yas melted pib txias.
5.Tuav Sijhawm: Lub clamping quab yuam yog khaws cia rau lub sijhawm ua ntej kom tso cai rau cov khoom fuse raws li cov yas yaj yaj ua kom txias thiab khov.Qhov no yog hu ua tuav lub sij hawm.(Faj seeb: Txhim kho kev sib koom ua ke lub zog thiab hermeticity tuaj yeem ua tiav los ntawm kev siv lub zog siab dua thaum lub sijhawm tuav. Qhov no ua tiav siv ob lub siab).
6.Horn Retracts: Thaum cov yas melted tau solidified, lub clamping quab yuam raug tshem tawm thiab lub ultrasonic horn yog retracted.Ob qhov khoom yas tam sim no tau koom ua ke zoo li molded ua ke thiab raug tshem tawm los ntawm qhov sib dhos ua ib feem.
Diffusion Vuam, DFW
Kev sib koom ua ke los ntawm cua sov thiab siab qhov chaw ntawm qhov chaw sib txuas los ntawm diffusion ntawm atoms.
Cov txheej txheem
Ob lub workpieces [1] ntawm qhov sib txawv yog muab tso rau ntawm ob lub xovxwm [2].Cov xovxwm yog qhov tshwj xeeb rau txhua qhov sib xyaw ua ke ntawm cov khoom ua haujlwm, nrog rau qhov tshwm sim uas yuav tsum muaj kev tsim qauv tshiab yog tias cov khoom tsim hloov pauv.
Thaum tshav kub kub sib npaug li 50-70% ntawm cov ntaub ntawv melting point yog ces nkag mus rau lub system, ua rau kom lub zog ntawm cov atoms ntawm ob cov ntaub ntawv.
Cov xovxwm raug nias ua ke, ua rau cov atoms pib diffusing ntawm cov ntaub ntawv ntawm qhov chaw sib cuag [3].Lub diffusion tshwm sim vim qhov chaw ua haujlwm yog qhov sib txawv ntawm qhov sib txawv, thaum tshav kub thiab siab tsuas yog ua rau cov txheej txheem yooj yim dua.Yog li ntawd, lub siab yog siv kom tau txais cov ntaub ntawv tiv tauj qhov chaw ze li sai tau kom cov atoms tau yooj yim dua diffuse.Thaum qhov xav tau kev faib ua feem ntawm atoms yog diffused, lub tshav kub thiab siab raug tshem tawm thiab kev sib txuas ua tiav.
