Lub luag haujlwm ntawm kev tiv thaiv roj
Nyob rau hauv laser welding, shielding roj yuav cuam tshuam rau lub weld tsim, weld zoo, weld nkag thiab nkag dav. Feem ntau, tshuab hluav taws xob tiv thaiv yuav muaj txiaj ntsig zoo rau cov vuam, tab sis nws kuj tuaj yeem ua rau muaj kev cuam tshuam tsis zoo.
Cov teebmeem zoo
1) Kev ua kom raug cua tshuab shielding gas yuav zoo tiv thaiv lub pas dej ua ke los ntawm kev txo lossis txawm tias tsis txhob oxidation;
2) Kev ua kom raug tshuab hauv cov roj thaiv kev tiv thaiv tuaj yeem txo qhov tawg tau tsim thaum lub sijhawm vuam;
3) Qhov tseeb tshuab ntawm cov roj tiv thaiv tuaj yeem txhawb nqa kev sib kis ntawm lub pas dej ua ke thaum nws solidifies, kom lub vuam yog tsim uniformly thiab zoo nkauj;
4) Kev ua kom raug tshuab hauv cov roj tiv thaiv tuaj yeem txo cov nyhuv shielding ntawm cov hlau vapor plume lossis plasma huab cua ntawm lub laser, thiab ua kom muaj txiaj ntsig zoo ntawm lub laser;
5) Kev siv lub tshuab ua kom zoo tuaj yeem txo cov qhov pores zoo.
Raws li ntev raws li hom roj, cov roj ntws 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 kev vuam.
Cov teebmeem tsis zoo yog raws li nram no:
1) Kev tshuab tsis raug ntawm cov khoom siv tiv thaiv yuav ua rau cov welds tsis zoo:
2) Xaiv qhov tsis ncaj ncees lawm hom roj yuav ua rau cov kab nrib pleb hauv cov vuam thiab kuj tseem tuaj yeem txo cov khoom siv ntawm cov vuam;
3) Kev xaiv cov pa roj tsis zoo tuaj yeem ua rau oxidation hnyav dua ntawm qhov vuam (txawm tias tus nqi ntws loj dhau los yog me dhau), lossis nws kuj tseem tuaj yeem ua rau lub pas dej hlau hlau ua rau muaj kev cuam tshuam loj heev los ntawm sab nraud quab yuam, ua rau cov khoom siv hluav taws xob tsis zoo tuaj yeem ua rau muaj kev cuam tshuam loj heev ntawm cov khoom siv vuam. weld kom tawg los yog tsim unevenly;
4) Kev xaiv cov roj tshuab tsis raug yuav ua rau cov vuam tsis muaj kev tiv thaiv lossis txawm tias tsis muaj kev tiv thaiv lossis muaj kev cuam tshuam tsis zoo rau kev tsim vuam;
5) Lub tshuab nqus tsev rau hauv cov roj tiv thaiv yuav muaj qee yam cuam tshuam rau qhov tob tob ntawm qhov vuam, tshwj xeeb tshaj yog thaum vuam nyias daim hlau, nws yuav txo qhov tob tob ntawm qhov vuam.
Hom kev tiv thaiv roj
Feem ntau siv laser vuam shielding gases feem ntau yog N2, Ar, Nws, thiab lawv lub cev thiab tshuaj muaj zog sib txawv, yog li cov nyhuv ntawm cov vuam kuj txawv.
1 Nitrogen N2
Lub zog ionization ntawm N2 yog nruab nrab, siab dua li ntawm Ar, thiab qis dua ntawm Nws. Nyob rau hauv qhov kev txiav txim ntawm laser, ionization degree yog qhov nruab nrab, uas tuaj yeem txo qhov tsim ntawm plasma huab, yog li ua kom muaj txiaj ntsig zoo ntawm laser. Nitrogen tuaj yeem siv tshuaj lom neeg nrog txhuas alloy thiab carbon hlau ntawm qhov kub thiab txias los tsim nitrides, uas yuav ua rau kom cov brittleness ntawm vuam. WeChat pej xeem account: Welder, qhov toughness yuav txo qis, uas yuav muaj kev cuam tshuam ntau dua rau cov khoom siv ntawm cov khoom sib txuas. , yog li nws tsis pom zoo kom siv nitrogen los tiv thaiv aluminium alloy thiab carbon steel welds.
Cov nitride uas tsim los ntawm cov tshuaj tiv thaiv ntawm nitrogen thiab stainless hlau tuaj yeem txhim kho lub zog ntawm kev sib koom ua ke, uas 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 Cov
Lub zog ionization ntawm Ar yog qhov tsawg, thiab cov qib ntawm ionization nyob rau hauv qhov kev txiav txim ntawm lub laser yog qhov siab, uas tsis tsim nyog rau kev tswj cov txheej txheem ntawm cov huab plasma, thiab yuav muaj qee yam cuam tshuam rau kev siv lub laser. Txawm li cas los xij, kev ua haujlwm ntawm Ar yog qhov tsawg heev, thiab nws nyuaj rau kev tshuaj lom neeg nrog cov hlau sib txawv. cov tshuaj tiv thaiv, thiab tus nqi ntawm Ar tsis siab. Tsis tas li ntawd, qhov ntom ntawm Ar yog qhov loj, uas yog qhov tsim nyog rau kev tso dej rau sab saum toj ntawm lub pas dej weld, uas tuaj yeem tiv thaiv lub pas dej weld zoo dua, yog li nws tuaj yeem siv tau raws li cov pa roj shielding.
3 Helium Nws
Nws muaj lub zog ionization siab tshaj plaws, thiab qib ionization qis heev nyob rau hauv qhov kev txiav txim ntawm lub laser, uas tuaj yeem tswj tau qhov tsim ntawm cov huab cua hauv plasma. Lub laser tuaj yeem ua rau cov hlau zoo heev. Nws chemically reacts nrog hlau thiab yog ib tug zoo weld shielding gas, tab sis tus nqi ntawm Nws yog siab dhau lawm. Feem ntau, cov roj no tsis yog siv rau hauv cov khoom tsim tawm ntau. Nws feem ntau yog siv rau kev tshawb fawb txog kev tshawb fawb lossis cov khoom lag luam uas muaj nqi ntxiv.
Shielding gas tshuab txoj kev
Tam sim no, muaj ob txoj hauv kev tseem ceeb los tshuab cov roj tiv thaiv: ib qho yog los tshuab cov roj tiv thaiv ntawm sab paraxial, raws li qhia hauv daim duab 1; lwm qhov yog coaxial tiv thaiv roj, raws li qhia hauv daim duab 2.
Daim duab 1
Daim duab 2
Yuav ua li cas xaiv ob txoj kev tshuab tshuab yog ib qho kev xav zoo. Feem ntau, nws raug pom zoo kom siv sab tshuab tiv thaiv roj txoj kev.
Xaiv txoj cai ntawm kev tiv thaiv roj tshuab
Ua ntej ntawm tag nrho cov, nws yuav tsum tau ua kom meej tias lub thiaj li hu ua "oxidation" ntawm weld tsuas yog ib lub npe. Nyob rau hauv txoj kev xav, nws txhais tau hais tias lub weld yog chemically reacted nrog teeb meem Cheebtsam nyob rau hauv cov huab cua, ua rau lub deterioration ntawm qhov zoo ntawm weld. Nws yog ib qho uas cov hlau weld yog nyob ntawm qhov kub thiab txias. Reacts chemically nrog oxygen, nitrogen, hydrogen, thiab lwm yam hauv huab cua.
Kev tiv thaiv lub vuam los ntawm kev "oxidized" yog los txo lossis tiv thaiv cov khoom tsim kev puas tsuaj los ntawm kev sib cuag nrog cov hlau vuam ntawm qhov kub thiab txias, tsis yog lub pas dej molten hlau xwb, tab sis txij li lub sij hawm cov hlau weld yog melted mus txog rau thaum lub pas dej ua ke hlau solidifies. thiab nws qhov kub thiab txias poob qis dua qhov ntsuas kub ntawm lub sijhawm.
Piv txwv
Piv txwv li, titanium alloy vuam tuaj yeem nqus tau hydrogen sai sai thaum qhov kub siab tshaj 300 degree, oxygen tuaj yeem nqus tau sai thaum qhov kub siab tshaj 450 degree, thiab nitrogen tuaj yeem nqus tau sai thaum nws siab tshaj 600 degree, yog li cov titanium alloy vuam yog. solidified thiab kub yog txo mus rau 300 degree Cov theem hauv qab no yuav tsum tau tiv thaiv zoo, txwv tsis pub lawv yuav "oxidized".
Nws tsis yog qhov nyuaj rau kev nkag siab los ntawm cov lus piav qhia saum toj no tias lub tshuab hluav taws xob tiv thaiv tsis yog tsuas yog xav tau los tiv thaiv lub pas dej ua ke hauv lub sijhawm, tab sis kuj yuav tsum tau tiv thaiv thaj chaw uas nyuam qhuav khov kho uas tau welded. Yog li ntawd, sab ncej sab qhia hauv daim duab 1 feem ntau yog siv. Tshuab lub shielding gas, vim hais tias qhov kev tiv thaiv ntau yam ntawm txoj kev no yog dav dua li ntawm cov coaxial tiv thaiv txoj kev nyob rau hauv daim duab 2, tshwj xeeb tshaj yog nyob rau hauv lub cheeb tsam uas cov weld tau cia li solidified muaj kev tiv thaiv zoo dua.
Rau cov ntawv thov engineering, tsis yog txhua yam khoom siv tuaj yeem siv cov khoom siv sab nraud ntawm lub tshuab hluav taws xob. Rau qee cov khoom tshwj xeeb, tsuas yog siv cov roj coaxial shielding, uas yuav tsum tau nqa tawm los ntawm cov khoom tsim thiab daim ntawv sib koom ua ke. Lub hom phiaj xaiv.
Kev xaiv cov txheej txheem tiv thaiv roj tshuab
1 Ncaj weld
Raws li pom nyob rau hauv daim duab 3, cov duab ntawm lub vuam seam ntawm cov khoom yog ib txoj kab ncaj nraim, thiab daim ntawv sib koom ua ke yog lub pob tw, lub puab tsaig sib koom ua ke, lub kaum sab xis ntawm lub kaum sab xis sib koom ua ke los yog lub voj voog welded. Nws yog qhov zoo dua los tshuab cov roj tiv thaiv ntawm sab ncej.
Daim duab 3
2 Lub dav hlau kaw cov duab welds
Raws li pom nyob rau hauv daim duab 4, cov duab ntawm lub vuam seam ntawm cov khoom yog ib tug kaw zoo xws li lub dav hlau voj voog, ib tug dav hlau polygon, thiab ib tug dav hlau multi-segment kab. Nws yog qhov zoo dua los siv cov coaxial shielding roj txoj kev qhia hauv daim duab 2.
Daim duab 4 Plane kaw daim duab weld
Cov kev xaiv ntawm shielding roj ncaj qha cuam tshuam qhov zoo, efficiency thiab nqi ntawm vuam ntau lawm. Txawm li cas los xij, vim muaj kev sib txawv ntawm cov khoom siv vuam, kev xaiv cov roj vuam kuj tseem nyuaj rau cov txheej txheem vuam tiag tiag. Nws yog ib qho tsim nyog yuav tsum ua tib zoo xav txog cov khoom siv vuam, vuam txoj kev, thiab vuam txoj haujlwm. Raws li qhov yuav tsum tau muaj cov nyhuv vuam, tsuas yog los ntawm kev ntsuas vuam tuaj yeem xaiv cov roj vuam zoo dua kom ua tiav cov txiaj ntsig zoo dua.
