Lub luag hauj lwm ntawm shielding gas
Nyob rau hauv laser welding, shielding gas cuam tshuam rau weld tsim, weld zoo, weld qhov tob thiab weld dav. Feem ntau, tshuab hauv shielding gas yuav muaj txiaj ntsig zoo rau lub vuam, tab sis nws kuj tuaj yeem muaj qhov tsis zoo.
Cov teebmeem zoo
- Kev ua kom raug cua tshuab shielding gas yuav zoo tiv thaiv lub pas dej ua ke los ntawm oxidation;
- Kev ua kom raug cua tshuab hauv shielding gas yuav zoo txo cov spatter generated thaum lub vuam txheej txheem;
- Qhov tseeb tshuab mus rau hauv cov roj shielding tuaj yeem txhawb kev sib koom ua ke ntawm lub pas dej welding sib npaug sib npaug, ua rau cov vuam zoo li qub thiab zoo nkauj;
- Qhov tseeb tshuab ntawm shielding gas tuaj yeem txo cov nyhuv shielding ntawm cov hlau vapor plume lossis plasma huab cua ntawm lub laser, ua kom muaj txiaj ntsig zoo ntawm lub laser;
- Kev tshuab kom raug hauv kev tiv thaiv roj tuaj yeem txo qhov vuam seam porosity. Raws li ntev raws li hom roj av, roj ntws tus nqi thiab tshuab tshuab raug xaiv kom raug, cov nyhuv zoo tagnrho tuaj yeem tau txais.
Txawm li cas los xij, kev siv tsis raug ntawm kev tiv thaiv roj kuj tuaj yeem muaj kev cuam tshuam tsis zoo rau vuam.
Cov teebmeem tsis zoo yog raws li nram no:
- Tsis raug cua tshuab-nyob rau hauv shielding gas yuav ua rau ib tug tsis zoo weld seam:
- Kev xaiv ntawm cov roj tsis raug tuaj yeem ua rau tawg ntawm cov vuam thiab kuj tseem tuaj yeem ua rau txo qis hauv cov khoom siv ntawm cov vuam;
- kev xaiv tsis ncaj ncees lawm ntawm cov roj tshuab-hauv cov dej ntws tuaj yeem ua rau oxidation hnyav dua ntawm cov vuam (txawm tias qhov dej ntws siab dhau los yog qis dhau) thiab kuj tseem tuaj yeem ua rau muaj kev cuam tshuam loj heev ntawm cov pas hlau vuam hlau los ntawm sab nraud quab yuam ua rau lub cev qhuav dej. lub weld los yog tsis sib xws;
- kev xaiv tsis ncaj ncees lawm ntawm cov roj tshuab tuaj yeem ua rau lub vuam tsis ua tiav qhov kev tiv thaiv lossis txawm tias qhov tseem ceeb tsis muaj kev tiv thaiv lossis cuam tshuam tsis zoo rau kev sib sau;
- tshuab mus rau hauv lub shielding gas yuav muaj ib tug tej yam kev cuam tshuam rau lub weld qhov tob, tshwj xeeb tshaj yog nyob rau hauv nyias phaj welding, yuav txo tau lub weld qhov tob.
Hom shielding gas
Feem ntau siv laser vuam shielding gases feem ntau yog N2, Ar, Nws, lawv lub cev thiab tshuaj lom neeg cov khoom sib txawv, thiab yog li ntawd cov nyhuv ntawm vuam seam kuj txawv.
1. Nitrogen N2
Lub zog ionization ntawm N2 yog nruab nrab, siab dua li ntawm Ar thiab qis dua nws. Lub degree ntawm ionization nyob rau hauv qhov kev txiav txim ntawm lub laser yog qhov nruab nrab, uas tuaj yeem txo qhov tsim ntawm cov huab cua hauv plasma thiab yog li ua kom muaj txiaj ntsig zoo ntawm kev siv lub laser. Nitrogen tuaj yeem cuam tshuam nrog aluminium alloy thiab carbon steel ntawm qhov kub thiab txias los tsim nitride, uas yuav ua rau kom cov brittleness ntawm cov vuam thiab txo cov tawv, thiab yuav muaj kev cuam tshuam ntau dua rau cov khoom siv ntawm cov khoom sib txuas, yog li nws yog tsis pom zoo siv nitrogen los tiv thaiv aluminium alloy thiab carbon steel weld. Cov tshuaj tiv thaiv ntawm nitrogen thiab stainless hlau ua cov nitrides uas tuaj yeem txhim kho lub zog ntawm cov welded sib koom ua ke thiab yuav pab txhim kho cov khoom siv ntawm cov vuam, yog li nitrogen tuaj yeem siv los ua cov roj tiv thaiv thaum vuam stainless hlau.
2. Argon Sib
Ar's ionization zog kuj tsawg, qib ntawm ionization nyob rau hauv qhov kev txiav txim ntawm lub laser yog siab, tsis conducive los tswj cov tsim ntawm cov plasma huab, yuav muaj tej yam kev cuam tshuam rau kev siv zoo ntawm lub laser, tab sis Ar kev ua si yog heev. qis, nws yog ib qho nyuaj rau cov tshuaj tiv thaiv nrog cov hlau, thiab Ar tus nqi tsis siab; Tsis tas li ntawd, qhov ntom ntawm Ar yog ntau dua, ua kom lub tog rau sab saum toj ntawm lub pas dej welding, tuaj yeem tiv thaiv lub pas dej weld zoo dua, yog li tuaj yeem siv los ua cov pa tiv thaiv cov pa roj.
3. Helium Nws
Lub zog ionization ntawm Nws yog qhov siab tshaj plaws, thiab cov qib ionization tsawg heev nyob rau hauv qhov kev txiav txim ntawm laser, yog li nws tuaj yeem tswj kev tsim cov huab cua hauv plasma zoo, thiab lub laser tuaj yeem ua haujlwm zoo ntawm cov hlau. Txawm li cas los xij, tus nqi ntawm Nws yog siab heev uas nws tsis yog siv rau cov khoom lag luam loj. Nws feem ntau yog siv rau kev tshawb fawb txog kev tshawb fawb lossis cov khoom lag luam nrog tus nqi ntxiv. Txoj kev uas lub shielding gas yog cua tshuab.
Muaj ob hom kev tiv thaiv roj cua tshuab hauv: ib qho yog sab ncej sab tshuab tiv thaiv roj thiab lwm yam yog coaxial shielding gas.
Feem ntau, nws raug nquahu kom siv cov txheej txheem tiv thaiv sab nraud.
Kev tiv thaiv roj tshuab txoj kev xaiv txoj cai
Ua ntej tshaj plaws, nws yuav tsum paub meej tias qhov hu ua "oxidation" ntawm lub vuam tsuas yog ib lub npe xwb, theoretically hais txog cov tshuaj tiv thaiv ntawm cov vuam thiab cov khoom tsis zoo hauv huab cua, uas ua rau qhov tsis zoo ntawm cov khoom siv hluav taws xob. qhov vuam, feem ntau cov hlau vuam ntawm qhov kub thiab txias thiab cov tshuaj tiv thaiv ntawm oxygen, nitrogen, hydrogen, thiab lwm yam hauv huab cua.
Txhawm rau tiv thaiv qhov vuam los ntawm "oxidized" yog kom txo lossis zam kev sib cuag ntawm cov khoom tsis zoo thiab cov hlau vuam ntawm qhov kub siab, uas tsis yog tsuas yog lub pas dej molten hlau, tab sis tag nrho cov txheej txheem los ntawm thaum lub vuam hlau yog yaj mus txog rau thaum lub pas dej ua ke. hlau solidifies thiab nws qhov kub thiab txias yog txo kom qis dua ib qho kub.
Piv txwv li, titanium alloy vuam, thaum kub siab tshaj 300 degree tuaj yeem nqus tau hydrogen sai, 450 degree siab dua qhov nqus pa sai sai, 600 degree siab dua qhov nqus sai ntawm nitrogen, yog li titanium alloy welds nyob rau hauv lub solidification thiab kub mus rau 300 degree hauv qab no. Cov theem no yuav muaj kev tiv thaiv zoo, txwv tsis pub nws yuav yog "oxidation".
Los ntawm cov lus piav qhia saum toj no, nws yog ib qho yooj yim to taub tias cov roj tiv thaiv cua tshuab tsis tsuas yog kev tiv thaiv raws sij hawm ntawm lub pas dej welding, tab sis kuj yuav tsum tau welded tsuas yog solidified cheeb tsam rau kev tiv thaiv, yog li kev siv dav dav ntawm sab axis sab tshuab tiv thaiv. roj, vim hais tias txoj kev tiv thaiv no piv rau kev tiv thaiv coaxial ntawm ntau yam kev tiv thaiv, tshwj xeeb tshaj yog rau cov weld xwb solidified cheeb tsam muaj kev tiv thaiv zoo dua.
Rau cov ntawv thov engineering, tsis yog txhua yam khoom tuaj yeem tiv thaiv los ntawm sab-blown shielding gas, thiab rau qee cov khoom tshwj xeeb, tsuas yog coaxial shielding gas tuaj yeem siv, uas yuav tsum tau xaiv xaiv los ntawm cov qauv khoom thiab daim ntawv sib koom ua ke.
Qhov kev xaiv tshwj xeeb tiv thaiv roj tshuab txoj kev
1. Txoj kab ncaj nraim welding seam
Cov duab ntawm lub weld seam yog ncaj, thiab daim ntawv ntawm kev sib koom ua ke yog pob tw, ncej puab, ces kaum sib koom los yog stacked weld taub hau.
2. Dav hlau kaw qauv vuam seam
Cov duab ntawm cov weld seam yog cov qauv kaw xws li lub dav hlau circumferential zoo, lub dav hlau ntau yam duab, lub dav hlau ntau ntu kab duab, thiab lwm yam. Daim ntawv ntawm kev sib koom ua ke yog pob tw, pob qij txha, stacked weld taub hau, thiab lwm yam. Hom khoom no yog qhov zoo dua rau txoj kev coaxial shielding gas.
Kev xaiv cov roj shielding ncaj qha cuam tshuam rau qhov zoo, kev ua tau zoo thiab tus nqi ntawm cov khoom siv vuam, tab sis vim muaj kev sib txawv ntawm cov khoom siv vuam, kev xaiv cov roj vuam kuj nyuaj rau cov txheej txheem vuam tiag tiag, uas yuav tsum tau xav txog cov khoom siv vuam, vuam txoj kev. , vuam txoj hauj lwm, thiab qhov yuav tsum tau vuam cov ntsiab lus, thiab los ntawm vuam kev ntsuam xyuas los xaiv ib tug zoo welding gas thiab ua tau zoo welding tau.
