Dab tsi yog qhov ceev faj rau kev vuam ntawm Gr9 titanium welded yeeb nkab?

1. Gr9 titanium weldability tsom xam

Titanium yog ib qho hlau siv, tuaj yeem tsim nyob rau ntawm chav tsev kub oxygen-muaj cov yeeb yaj kiab tuab, tswj cov kev ruaj khov thiab corrosion tsis kam. 540 degree saum toj no cov oxide zaj duab xis generated tsis ntom. Titanium thiab oxygen, nitrogen, hydrogen ntawm qhov kub thiab txias, titanium ntawm 300 degree siab tshaj qhov nqus sai ntawm hydrogen, 400 degree siab tshaj qhov pib ntawm oxygen thiab nitrogen nqus, 600 degree siab dua qhov nqus sai ntawm oxygen, 700 degree siab dua qhov nqus sai. ntawm nitrogen. Oxygen, nitrogen dissolution ntawm titanium kom txo tau cov plasticity thiab toughness ntawm titanium, hydrogen dissolution ntawm titanium los txhim kho lub brittleness ntawm titanium, lub toughness ntawm ntse poob. Cov pa roj carbon zoo yaj hauv titanium los ntawm qhov chaw interstitial los txhim kho lub zog ntawm titanium thiab txo cov yas, thiab thaum cov ntsiab lus carbon ntau tshaj qhov solubility, tawv thiab nkig TiC yog tsim, uas yog faib nyob rau hauv daim ntawv ntawm ib tug network thiab yog nquag mus cracking. . Tsis tas li ntawd, lub melting point ntawm titanium yog siab, qhov tshwj xeeb kub thiab thermal conductivity yog me me, qhov txias txias yog qeeb, qhov vuam kub-cuam tshuam cheeb tsam ntawm qhov kub thiab txias rau ib ntev lub sij hawm, qhov kub yog heev yooj yim mus overheat coarsening, ua rau txo qis hauv plasticity ntawm qhov sib koom ua ke. Weldability ntawm titanium tuaj yeem txheeb xyuas los ntawm cov yam ntxwv saum toj no ntawm titanium. Txhawm rau kom ntseeg tau tias kev ua haujlwm ntawm cov pob qij txha welded, kev nkag mus ntawm carbon, nitrogen, oxygen thiab hydrogen yuav tsum tau tswj. Yog li ntawd, yuav ua li cas kom titanium huv si thiab tiv thaiv ntawm qhov kub thiab txias yog qhov teeb meem tseem ceeb. Nyob rau tib lub sijhawm, qhov kub ntawm cov welded sib koom yuav tsum tau tswj kom tsis txhob overheating cuam tshuam qhov kev ua tau zoo ntawm cov welded sib koom. Argon yog ib qho roj inert, tsis muaj titanium los tsim ib qho kev daws teeb meem, thiab tsis hnov ​​​​mob nrog lwm cov ntsiab lus, yog li titanium vuam yog tsim rau argon arc vuam, tab sis lub purity ntawm argon roj yuav tsum siab heev, dav dav purity ntau dua los yog sib npaug rau 99.99. %.

2. Kev npaj vuam

(1) vuam qhov chaw thiab ib puag ncig

Vuam ib puag ncig yuav tsum huv, tsis muaj pa luam yeeb, tsis muaj plua plav, ywj siab. Vuam ib puag ncig ntawm tej yam ntuj tso: cua ceev Ntau tshaj los yog sib npaug rau 1.5m / s, txheeb ze av noo> 80%, kub<5 ℃, rain and snow without defense shall not be welded. For example, when welding in the steel structure workshop, the titanium welding area should be separated from the steel structure area to prevent contamination of iron powder, gas and other harmful impurities; welding should be away from the vents and open doors and windows, and the site should be paved with rubber mats.

(2) kev tsim cov npog tiv thaiv, txhawm rau ua kom titanium nyob rau hauv qhov chaw kub siab (siab tshaj 200 degree) tiv thaiv tag nrho los ntawm argon, yuav tsum ua kom muaj kev tiv thaiv zoo, kev ua haujlwm vuam yog yooj yim tiv thaiv npog. Vim hais tias cov qauv ntawm cov ntaub thaiv npog ncaj qha cuam tshuam rau qhov zoo ntawm vuam thiab vuam efficiency, yog li tom qab ntau yam qauv tsim thiab vuam kev ntsuam xyuas, cov qauv ntawm daim ntaub thaiv thaum kawg txiav txim siab. Tsis tas li ntawd, qhov tshwj xeeb lub ntiajteb txawj nqus ntawm argon yog siab tshaj huab cua, yog li lub npog tiv thaiv tuaj yeem txiav txim siab thaum ua lub npog tiv thaiv saum lub hau tiv thaiv kom tawm hauv qhov chaw ua haujlwm.

(3) Bevel processing bevels yuav tsum tau ua tiav, piv txwv li, bevels yuav tsum tau ua tiav siv cov cuab yeej xws li beveling machine, pneumatic internal grinders, alumina los yog silicon carbide sib tsoo thiab polishing discs. Thaum machining lub bevel, thov ua kom maj mam (lossis siv cov dej txias kom txias), thiaj li tsis ua kom qhov kub thiab txias siab dhau. Tom qab txiav lub bevel nto yuav tsum tiaj tus thiab du, yuav tsis muaj kab nrib pleb, laminations, inclusions, burrs, ya npoo thiab oxidation xim, thiab lwm yam. Qhov saum npoo ntawm bevel thiab nyob rau hauv 30 hli ntawm ob sab ntawm cov hlau luster yog nyiaj dawb.

(4) ntxuav ua ntej welding hlau, bevel nto thiab ob sab hauv 20mm rau qhov chaw tu. Raws li cov degree ntawm cov kab mob degreasing tuaj yeem xaiv degreasing, kev tu txhua yam lossis tshuaj ntxuav, kev tu txhua yam tso cai rau kev siv cov hlau stainless hlau txhuam. Vuam ua ntej daim ntawv thov ntawm acetone los yog anhydrous ethanol thiab lwm yam kuab tshuaj los ntxuav lub zawj thiab hlau, tsis txhob kov cov tes tom qab ntxuav, welding raws sij hawm nyob rau hauv 4 teev, tas sij hawm vuam yuav tsum tau muab ntxuav dua. Cov vuam hlau huv huv yuav tsum tsis txhob muab pov rau hauv av, yuav tsum tau muab tso rau hauv ib lub raj titanium kom tsis txhob rov kis kab mob.

3. vuam

(1) Kev ntsuam xyuas txheej txheem vuam

Kev ntsuam xyuas txheej txheem vuam raws li NB/T47014-2011, vuam txheej txheem ntsuas cov khoom siv titanium siv rau TA2, titanium yeeb nkab specifications rau φ45mm × 3mm. nyob rau hauv kev npaj cov kev pab cuam ua ntej vuam, yuav tsum yog lub hauv paus ntsiab lus ntawm weld operability thiab zoo ntawm welded pob qij txha. Txhawm rau kom ntseeg tau tias titanium coil sizing welded pob qij txha kom ua tau raws li qhov yuav tsum tau siv, vuam txheej txheem ntsuas kev ntsuas raws li cov txheej txheem ua ntej vuam. Argon arc vuam tshuab qauv WSM315, siv high-frequency arc, argon siv ntshiab argon (99.99% Ar). Vuam txheej txheem ntsuam xyuas cov txiaj ntsig tuaj yeem pom cov txheej txheem vuam kev ntsuam xyuas cov txiaj ntsig tau tsim nyog.

(2) hlais kev kuaj corrosion

Txhawm rau kuaj qhov corrosion kuj ntawm welded pob qij txha, kev siv cov argon arc vuam vuam cov qauv titanium raj, sealing yog siv los tiv thaiv cov dej, nrog rau qhov nruab nrab weld txhob txwm tsis txhob tiv thaiv, lub weld yog daj, ib feem ntawm xiav, tshuav nyiaj-dawb. Titanium raj txiav cov qauv, siv 30% sulfuric acid (boiling) tom qab 24h soak corrosion test, cov qhabnias qhia tau hais tias cov nyiaj-dawb weld muaj ib tug me ntsis corrosion, thaum lub xiav golden-daj weld corrosion yog loj, qhia tias nyob rau hauv lub vuam. txheej txheem, qhov vuam los ntawm kev tiv thaiv dej ntawm corrosion-resistant weld zoo li.

(3) Titanium coil vuam

Vuam txheej txheem ntsuam xyuas thiab kev kuaj corrosion tsim nyog ua ntej vuam cov khoom. Raws li cov txheej txheem vuam kev soj ntsuam ntawm kev npaj cov txheej txheem vuam cov txheej txheem, raws li cov txheej txheem vuam cov txheej txheem ntawm cov tsis thiab cov kev cai rau vuam ntawm lub coiler. Vim tias lub coiler ntev dua, hnyav dua thaum vuam, nws nyuaj rau tig manually, yog li lub coiler tuaj yeem muab tso rau ntawm lub log txhawb nqa, uas tuaj yeem tig thiab welded. Nyob rau tib lub sij hawm, thawj xya ncaj titanium raj rau ib pab pawg neeg vuam tom qab vuam, vuam nyob rau hauv ob txheej, hauv qab vuam raj los ntawm cov ntshiab argon rau kev tiv thaiv (thawj argon 10 ~ 15min, cua hauv lub raj ua ntej vuam), welding ntawm lub raj sab nraum lub npog tiv thaiv kev tiv thaiv, yuav tsum tau welded weld lub qhov ncauj kaw nrog daim kab xev, lub qhov ncauj ntawm lub raj kaw nrog daim kab xev thiab muab tso rau hauv argon raj los ntawm argon, lub xeem lub qhov ncauj ntawm lub raj kaw nrog daim kab xev, thiab ntaus ob peb qhov me me kom tsis suav nrog huab cua thiab argon. Tag nrho cov chaw nres nkoj welded welded hauv qab vuam tom qab npog vuam, npog vuam los tiv thaiv cov dej hauv lub raj, xyuam xim rau cov dej yuav tsum tau ntim cov dej hauv lub raj kom tiv thaiv lub raj los ntawm kev tuav cov cua, sab nraum lub raj nrog kev tiv thaiv npog los ntawm cov argon gas. Thaum vuam, qhov kub ntawm lub titanium raj yuav tsum tau tswj txhua lub sijhawm hauv qab 200 degree.