Vuam txheej txheem yuav tsum tau rau PTA Unit Titanium Thaum tshav kub kub Exchangers

Cov kev tsim khoom ntawm purified terephthalic acid (PTA) yog qhov hnyav. Cov condensers nyob rau hauv PTA units tau raug corrosive media xws li acetic acid thiab bromide ions ntev.Titanium thiab titanium alloystau dhau los ua cov ntaub ntawv nyiam vim lawv zoo heev corrosion kuj thiab mechanical zog.

 

 

1. Titanium tau yooj yim adsorbs oxygen, nitrogen thiab hydrogen saum 400 degree, tsim cov khoom nkig uas txo cov plasticity thiab toughness ntawm welds thiab txawm ua rau brittle puas.

2. Ntshiab titanium muaj cov thermal conductivity tsawg, thiab vuam nyhav los tsim cov nplej ntxhib lossis cov qauv martensitic, txo cov yas sib koom ua ke.

3. Feem ntau porosity defects: Cov kab mob, noo noo, impure shielding gas thiab lwm yam yooj yim ua rau porosity, txo weld zog thiab nruj thiab inducing corrosion tsis ua hauj lwm.

4. Kev cuam tshuam rau ncua sij hawm tawg: Hydrogen enrichment nyob rau hauv tshav kub- cuam tshuam cheeb tsam ua ke nrog cov residual stress yooj yim ua rau hydrogen-induced txias cracking.

 

 

1. Ua haujlwm ib puag ncig:

Lub tsev kawm ntawv yuav tsum tsis muaj cov kab mob hlau, nrog rau qhov tsim nyog kub thiab av noo; Cov neeg ua haujlwm yuav tsum hnav cov khoom tiv thaiv tus qauv thiab siv cov cuab yeej tshwj xeeb rau titanium thiab stainless hlau.

 

2. Cov khoom siv tswj:

Xyuas kom tseeb tias cov hlau hauv paus tsis muaj cov kab mob hlau tsis huv thiab cov hlau txuas txuas nrog cov hlau hauv paus; siv siab -purity argon thiab nres ua haujlwm yog tias cov pa roj tsis txaus.

 

3.Pre- vuam tu:

Sib tsoo thaj tsam zawj rau cov hlau nplaum, tshem tawm cov kab mob nrog cov kuab tshuaj, thiab txuas hauv 4 teev tom qab kho.

 

4.Groove los ua ke:

Tshuab txheem grooves, nruj me ntsis tswj kev sib dhos misalignment thiab qhov sib txawv; tack welding yuav tsum ua raws li cov txheej txheem welding.

 

 

1. Vuam txoj kev:

Kev tuav tungsten inert gas (TIG) vuam yuav tsum tau saws, nruab nrog ib tug ruaj khov DC TIG welder nrog siab - zaus arc pib thiab tam sim no attenuation functions. Cov ntawv tshaj tawm - lub sijhawm siv roj yuav tsum tsis pub tsawg tshaj 15 vib nas this.

 

2. Txheej txheem tsis:

Ua raws li cov hauv paus ntsiab lus ntawm qhov tsis tshua muaj tam sim no, siab vuam ceev thiab ntau- txheej / ntau- hla vuam. Rau Gr2 titanium, siv 2.4 hli vuam hlau nrog DC electrode zoo (DCEP). nruj tswj tam sim no, voltage, vuam ceev thiab argon txaus tus nqi; txais yuav luv- arc kev ua haujlwm nrog arc ntev Tsawg dua lossis sib npaug li 3 hli, ib zaug - txheej vuam thickness Tsawg dua lossis sib npaug li 3 hli, thiab txheej staggered- kis pob qij txha.

 

3.Argon tiv thaiv:

Tag nrho cov chaw tiv thaiv saum toj 400 degree. Txhim kho lub vuam teeb nrog tooj liab trailing shield rau pem hauv ntej - sab tiv thaiv, thiab rov qab ntxuav cov vuam nrog argon kom cais cov huab cua. Ua pa ua ntej arc pib thiab khaws cov roj kom txog thaum lub vuam txias kom qis dua 100℃tom qab arc extinguishing; tswj cov pa roj kom tsim nyog thiab siv cov roj hmab yas kom tsis txhob muaj kab mob.

 

4.Interpass kub tswj:

Interpass kub yuav tsum nruj me ntsis tswj hauv qab 60 degree. Kev kub siab heev yuav ua rau cov nplej coarsening thiab kev ua haujlwm degradation; tooj liab daim hlau tuaj yeem siv rau kev pabcuam txias.

 

 

1.Pre-welding npaj
Lub raj xa hluav taws xob yuav tsum txuas 0.5-1.0 hli dhau ntawm lub raj - daim ntawv nto. Ua tib zoo tshem tawm cov impurities thiab burrs los ntawm lub raj kawg thiab lub raj - daim ntawv qhov, thiab nruj me ntsis tswj qhov haum qhov sib txawv kom tsis txhob nthuav kev tawg.

 

2. vuam txheej txheem
Txais Z- kauj ruam vuam kom txo deformation; weld tube qhib nyob rau hauv ob kis (hauv paus pass thiab capping pass) nrog staggered pib thiab xaus cov ntsiab lus. Siv 2.5 hli cerium tungsten electrode, vuam tam sim no 80-120 A, argon txaus tus nqi 10-15 L / min. Qhov tam sim no yuav tsum qis dua me ntsis rau lub taub qab vuam kom tsis txhob hlawv - los ntawm cov phab ntsa raj.

 

3.Post-welding expansion
Nthuav cov cua kub pauv cov raj tom qab vuam kom tshem tawm cov khoob khoob thiab tiv thaiv crevice corrosion. Tswj lub zog nthuav dav kom tsis txhob muaj lub raj tawg thiab lub raj -daim ntawv deformation.

 

 

1. Kev tshuaj xyuas qhov muag
Tsim nyog welds yog silvery dawb los yog golden daj. Xiav, ntshav lossis grey xim qhia tias muaj oxidation ntau dhau thiab yuav tsum tau sib tsoo thiab rov ua dua. Welds yuav tsum tsis txhob muaj cov kab nrib pleb, porosity thiab lwm yam tsis xws luag, nrog kev txhawb zog tsawg dua los yog sib npaug li 1.5 hli thiab tsis qis dua lub hauv paus hlau nto.

 

2. Tsis yog -kev kuaj kev puas tsuaj

Kev ntsuam xyuas Penetrant (PT): Ua kev ntsuam xyuas ntawm txhua qhov welds 24 teev tom qab vuam kom pom cov kab nrib pleb.

Kev ntsuas hluav taws xob (RT): Tshawb xyuas qhov tseem ceeb ntawm lub pob tw welds, nrog Qib II raws li tus qauv tsim nyog.

Helium leak testing: Kuaj qhov nruj ntawm lub raj -cov ntaub ntawv sib txuas kom tiv thaiv kom tsis txhob yaig.

 

3.Kev tsis xws luag thiab kev tiv thaiv

Oxidative discoloration: Xyuas kom siab -purity argon, txhim kho cov khoom siv tiv thaiv, thiab txuas ntxiv tom qab- lub sijhawm siv roj.

Porosity: Ua tib zoo ntxuav cov vuam thiab vuam hlau, thiab siv cov qauv luv luv - arc vuam.

Cracking: nruj me ntsis tswj cov ntsiab lus hydrogen thiab interpass kub, thiab npaj vuam sib lawv liag tsim nyog.

Tsis muaj kev nkag mus: Sib tw tam sim no thiab vuam ceev, thiab khaws cia tus qauv qhov sib txawv.

 

4. Kev kho tsis raug
Mechanically tshem tawm qhov tsis xws luag ua ntej kho vuam nrog cov txheej txheem qub. Kev kho ib leeg yuav tsum tsis pub tshaj ob zaug, thiab tag nrho cov ntsuas yuav tsum tau rov qab- tshuaj xyuas tom qab kho.

 

 

Ruihang Group feem ntau tsim cov khoom siv titanium nrog kev ua tiav kev lag luam, suav nrog smelting, forging, straightening, dov, deg kho, kuaj txheej txheem. Rau txhua qhov kev xav tau, thov hu rau peb ntawm email:Sam.Rui@bjrh-titanium.com