Qhov sib txawv ntawm cov roj av hauv laser vuam tshuab
Nyob rau hauv laser vuam, pab roj av ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv weld rhawv dej, thiab tiv thaiv tsis zoo xws li oxidation thiab porosity. Kev xaiv ntawm cov roj nyob ntawm cov khoom siv tau, vuam cov mob, thiab xav tau weld zoo. Hauv qab no yog qhov sib txawv tseem ceeb ntawm cov khoom siv uas siv tau siv:
1. Cov roj av (Argon - AR, Helium - nws)
Cov yam ntxwv:
Cov inert (tsis muaj kev tawm tsam nrog Molten hlau).
Argon (ar): denser tshaj li huab cua, muab cov ntaub thaiv npog, raug nqi.
Helium (nws): Ntau dua thermal conductivity, txhim kho kev nkag mus rau hauv high-fais fab vuam (piv txwv li, tooj liab), tab sis kim.
Zoo tshaj plaws rau:
Stainless hlau, Titanium, nickel alloys, thiab lwm yam kev xav ntawm cov hlau.
Nws tau nyiam rau cov ntaub ntawv siab (piv txwv li, tooj liab) lossis tob-vuam vuam.
2. Resive Gases (Nitrogen - N₂, carbon dioxide - co₂)
Nitrogen (n₂):
Pros: Tus nqi qis, tuaj yeem txhim kho corrosion tsis kam nyob rau hauv qee cov hlau (xws li, duplex stainless hlau).
Cons: Yuav tsim cov nitrides nrog titanium \/ Aluminium, ua rau brittleness.
Cov pa roj carbon dioxide (CO₂):
Pros: txhim kho Arc ruaj khov (hauv hybrid laser laser-arc vuam), yig rau cov pob roj carbon.
Cons: tuaj yeem ua rau oxidation (ua sluag ntawm weld nto).
Zoo tshaj plaws rau:
N₂: Cov hlau roj carbon tsawg, qee cov hlau stainless (yog tias sib xws).
CO₂: Carbon Steel Vuam Qhov chaw me oxidation lees txais.
3. Roj Mixtures
Yam ua txhaum:
AR + nws: sib npaug tiv thaiv thiab nkag mus (siv hauv cov ntawv thov aerospace).
AR + H₂ ({2-5%): txo cov tshuaj oxides hauv cov hlau stainless hlau (tab sis kev pheej hmoo ntawm hydrogen nrib pleb).
A + CO: raug nqi rau cov vuam me me.
Cov txiaj ntsig zoo: customizable kom zoo dua weld zoo, spatation tswj, lossis cov nqi txuag.
4. Cov Ntsiab Lus Tseem Ceeb
Cov Khoom Siv: Cov hlau reactive (ti, al) yuav tsum muaj roj av; Cov Hlau Hlau Ua Kom Ta \/ Coos.
Kev nkag siab xav tau: Nws lossis AR-nws sib xyaw rau Welds sib sib zog.
Cov Khoom Zoo: Ntshiab A lossis Ar-H₂ rau kev huv, oxidation-dawb wels.
Tus nqi: nws yog kim; Ar yog kev sib npaug; N₂ \/ CO₂ yog yig.
5. Cov haujlwm ntxiv ntawm cov txiaj ntsig
Ntshav supression: Tiv thaiv cov kab qaster laser sciatering hauv high-hwj chim vuam.
Spatter & Fume tswj: blows deb vaporized cov khoom (piv txwv li zinc hauv galvanized steel).
Kev tiv thaiv tiv thaiv: Cov roj uas muaj kom raug roj txo tau txo cov pa nkag.
Piv txwv los ntawm cov khoom siv
Stainless hlau: AR (tiv thaiv oxidation).
Aluminium: A lossis Ar-Nws (txhim kho kom sov).
Carbon Steel: CO₂ lossis AR-Coo (tus nqi txuag).
Titanium: High-purity ar (pem hauv ntej & tom qab tiv thaiv yuav tsum tau).
Cov roj ntau ntawm cov roj nyob ntawm lub laser tsis muaj zog (lub zog, nthwv dej) thiab daim ntawv thov. Kev xeem feem ntau xav tau los txiav txim siab qhov kev xaiv zoo tshaj plaws.
--------- Victor Feng
Rayther Laser