1. Technical yam tseem ceeb ntawm argontungsten arc vuam
1.1 Kev xaiv ntawm tungsten argon arc vuam tshuab thiab lub zog polarity
TIG tuaj yeem muab faib ua DC thiab AC pulses.DC pulse TIG yog tsuas yog siv rau vuam hlau, me me hlau, kub-resistant steel, thiab lwm yam, thiab AC pulse TIG yog tsuas yog siv rau vuam lub teeb hlau xws li txhuas, magnesium, tooj liab thiab lawv alloys.Ob lub AC thiab DC pulses siv lub hwj huam mov nrog cov yam ntxwv poob qis, thiab TIG vuam ntawm cov ntawv hlau stainless feem ntau siv DC zoo txuas.
1.2 Txuj ci tseem ceeb ntawm phau ntawv argon tungsten arc vuam
1.2.1 Arc tawm tsam
Muaj ob hom arc ignition: tsis sib cuag thiab tiv tauj luv luv-circuit arc ignition.Lub qub electrode tsis nyob rau hauv kev sib cuag nrog lub workpiece thiab yog haum rau ob qho tib si DC thiab AC vuam, thaum lub tom kawg tsuas yog haum rau DC vuam.Yog hais tias luv luv-circuit txoj kev siv los ntaus lub arc, lub arc yuav tsum tsis txhob pib ncaj qha rau ntawm lub vuam, vim hais tias nws yog ib qho yooj yim mus ua tungsten inclusion los yog bonded nrog lub workpiece, lub arc tsis tuaj yeem stabilized tam sim ntawd, thiab lub arc yog ib qho yooj yim rau kev siv tungsten. nkag mus rau hauv cov khoom siv hauv paus, yog li yuav tsum tau siv arc ntaus phaj.Muab lub phaj tooj liab liab ntawm ib sab ntawm qhov taw tes arc, pib lub arc rau nws ua ntej, thiab tom qab ntawd txav mus rau qhov chaw yuav tsum tau welded tom qab lub taub hau tungsten yog rhuab mus rau qhov kub thiab txias.Hauv kev tsim khoom tiag tiag, TIG feem ntau siv lub tshuab hluav taws xob los pib lub arc.Nyob rau hauv qhov kev txiav txim ntawm cov mem tes tam sim no, cov roj argon yog ionized los pib lub arc.
1.2.2 Tack welding
Thaum lub sij hawm tack welding, welding hlau yuav tsum nyias dua li cov vuam hlau.Vim tias qhov kub thiab txias ceev thaum lub sijhawm vuam, lub arc nyob twj ywm rau lub sijhawm ntev, yog li nws yooj yim rau hlawv.Thaum ua qhov chaw vuam, vuam hlau yuav tsum muab tso rau ntawm qhov chaw vuam txoj hauj lwm, thiab lub arc yog ruaj khov Ces txav mus rau vuam hlau, thiab nres lub arc sai sai tom qab vuam hlau melts thiab fuses nrog lub hauv paus hlau ntawm ob sab.
1.2.3 Ib txwm vuam
Thaum TIG zoo tib yam siv rau vuam stainless hlau los xij, qhov tam sim no siv tus nqi me me, tab sis thaum tam sim no tsawg dua 20A, arc drift yog ib qho yooj yim tshwm sim, thiab qhov kub ntawm qhov chaw cathode siab heev, uas yuav ua rau kub poob. Nyob rau hauv lub vuam cheeb tsam thiab tsis zoo electron emission tej yam kev mob, uas ua rau lub cathode chaw yog tas li dhia thiab nws yog ib qho nyuaj rau tuav ib tug zoo soldering.Thaum siv cov pulsed TIG, lub ncov tam sim no tuaj yeem ua rau arc ruaj khov, kev ncaj ncees yog qhov zoo, thiab lub hauv paus hlau yog yooj yim rau yaj thiab daim ntawv, thiab cov cycles yog alternated los xyuas kom meej qhov kev vam meej ntawm cov txheej txheem vuam.welds.
2. Weldability tsom xam ntawm stainless hlau ntawv
Lub cev lub cev thiab cov duab ntawm cov ntawv hlau stainless ncaj qha cuam tshuam rau qhov zoo ntawm qhov vuam.Stainless hlau ntawv muaj ib tug me me thermal conductivity thiab ib tug loj linear expansion coefficient.Thaum lub vuam kub hloov pauv sai, lub thermal stress generated loj, thiab nws yog ib qho yooj yim ua rau hlawv-los ntawm, undercut thiab yoj deformation.Lub vuam ntawm cov ntawv hlau stainless feem ntau yog siv lub taub qab vuam.Lub pas dej molten feem ntau cuam tshuam los ntawm lub zog arc, lub ntiajteb txawj nqus ntawm lub pas dej molten hlau thiab qhov nro ntawm lub pas dej molten hlau.Thaum lub ntim, zoo thiab molten dav ntawm lub pas dej molten hlau yog tas li, qhov tob ntawm lub pas dej molten nyob ntawm lub arc.Qhov luaj li cas, qhov tob tob thiab arc quab yuam muaj feem xyuam rau qhov vuam tam sim no, thiab qhov dav fusion yog txiav txim siab los ntawm arc voltage.
Qhov loj dua qhov ntim ntawm lub pas dej molten, qhov loj dua qhov nro.Thaum qhov nro tsis tuaj yeem sib npaug ntawm lub zog arc thiab lub ntiajteb txawj nqus ntawm lub pas dej molten hlau, nws yuav ua rau lub pas dej molten hlawv, thiab nws yuav raug cua sov thiab txias hauv zos thaum lub sij hawm vuam, ua rau cov welment rau inhomogeneous stress thiab strain, Thaum lub longitudinal shortening ntawm weld seam ua rau muaj kev ntxhov siab rau ntawm ntug ntawm lub phaj nyias kom dhau ib qho nqi, nws yuav ua rau muaj kev cuam tshuam loj dua yoj deformation thiab cuam tshuam rau cov duab zoo ntawm workpiece.Raws li tib txoj kev vuam thiab cov txheej txheem tsis sib txawv, cov duab sib txawv ntawm tungsten electrodes yog siv los txo cov cua sov tawm ntawm qhov sib koom ua ke, uas tuaj yeem daws cov teeb meem ntawm vuam kub-dhau thiab workpiece deformation.
3. Daim ntawv thov ntawm phau ntawv tungsten argon arc vuam nyob rau hauv stainless hlau ntawv vuam
3.1 Vuam txoj cai
Argon tungsten arc vuam yog ib hom qhib arc vuam nrog ruaj khov arc thiab kuj tseem muaj cua sov.Nyob rau hauv kev tiv thaiv ntawm inert gas (argon gas), lub vuam pas dej ua ke yog ntshiab thiab qhov zoo ntawm weld seam yog zoo.Txawm li cas los xij, thaum welding stainless hlau, tshwj xeeb tshaj yog austenitic stainless hlau, lub nraub qaum ntawm lub vuam kuj yuav tsum tau tiv thaiv, txwv tsis pub oxidation loj yuav tshwm sim, uas yuav cuam tshuam rau kev tsim vuam thiab vuam kev ua tau zoo.
3.2 Welding yam ntxwv
Lub vuam ntawm stainless hlau nplooj ntawv muaj cov yam ntxwv hauv qab no:
1) Cov thermal conductivity ntawm cov ntawv hlau stainless tsis zoo, thiab nws yooj yim rau hlawv los ntawm ncaj qha.
2) Tsis muaj vuam hlau yuav tsum tau thaum lub sij hawm vuam, thiab lub hauv paus hlau yog ncaj qha fused.
Yog li ntawd, qhov zoo ntawm stainless hlau daim ntawv welding yog ze ze rau tej yam xws li cov neeg ua haujlwm, cov khoom siv, cov khoom siv, kev tsim kho, ib puag ncig sab nraud thiab kev sim thaum vuam.
Nyob rau hauv cov txheej txheem welding ntawm stainless hlau los xij, vuam consumables tsis tas yuav tsum tau, tab sis qhov yuav tsum tau rau cov ntaub ntawv nram qab no kuj siab: ib tug yog purity ntawm argon roj, tus nqi txaus thiab lub sij hawm ntawm argon txaus, thiab lwm yam yog tungsten. electrode.
1) Argon
Argon yog ib qho roj inert, thiab nws tsis yooj yim rau hnov mob nrog lwm cov ntaub ntawv hlau thiab roj.Vim tias qhov txias txias ntawm nws cov cua ntws, qhov chaw tshav kub cuam tshuam ntawm cov vuam yog me me, thiab qhov deformation ntawm vuam yog me me.Nws yog qhov zoo tshaj plaws tiv thaiv roj rau argon tungsten arc vuam.Lub purity ntawm argon yuav tsum ntau dua 99.99%.Argon feem ntau yog siv los tiv thaiv lub pas dej molten, tiv thaiv huab cua los ntawm eroding lub pas dej molten thiab ua rau oxidation thaum lub sij hawm vuam, thiab tib lub sij hawm zoo cais thaj chaw weld los ntawm huab cua, yog li ntawd lub weld cheeb tsam tiv thaiv thiab lub vuam kev ua tau zoo dua.
2) Tungsten electrode
Qhov saum npoo ntawm tungsten electrode yuav tsum du, thiab qhov kawg yuav tsum tau sharpened nrog zoo concentricity.Nyob rau hauv no txoj kev, lub high-frequency arc ignition yog zoo, lub arc stability yog zoo, lub vuam qhov tob yog tob, lub molten pas dej ua ke yuav ruaj khov, weld seam yog zoo tsim, thiab welding zoo.Yog hais tias qhov chaw ntawm tungsten electrode raug hlawv los yog muaj qhov tsis xws luag xws li cov pa phem, cov kab nrib pleb, thiab cov kab noj hniav shrinkage ntawm qhov chaw, nws yuav nyuaj rau kev pib lub tshuab hluav taws xob ntau zaus thaum vuam, lub arc yuav tsis ruaj khov, lub arc yuav nyuaj. drift, lub pas dej molten yuav disperse, nto yuav nthuav dav, qhov tob nkag mus yuav ntiav, thiab weld seam yuav puas.Kev tsim tsis zoo, vuam tsis zoo.
4 Kev xaus
1) Kev ruaj ntseg ntawm argon tungsten arc vuam yog qhov zoo, thiab cov duab sib txawv tungsten electrode muaj kev cuam tshuam zoo rau kev vuam zoo ntawm cov nplooj ntawv stainless hlau.
2) Tungsten electrode welding nrog lub tiaj tus sab saum toj thiab conical tip tuaj yeem txhim kho qhov tsim ntawm ib leeg-sab vuam thiab ob sab vuam, txo qhov kub ntawm qhov cuam tshuam ntawm vuam, cov vuam zoo nkauj zoo nkauj, thiab cov cuab yeej siv tau zoo dua.
3) Siv txoj kev vuam kom raug tuaj yeem tiv thaiv qhov tsis xws luag.
Post lub sij hawm: Lub Xya hli ntuj-18-2023