Kev kho ntawm titanium alloy yeeb nkab welds thiab daim ntawv thov cov ntsiab lus ntawm titanium yeeb nkab luj tshib

Internal defects nyob rau hauv titanium alloy yeeb nkab welds yog incomplete penetration, uas yog hais txog qhov tsis xws luag nyob rau hauv lub tsis muaj fusion ntawm lub workpiece thiab weld hlau los yog nruab nrab ntawm weld txheej. Kev nkag mus tsis txaus yuav ua rau tsis muaj zog ntawm kev ua haujlwm hla ntu ntawm cov vuam, ua rau muaj kev ntxhov siab loj heev thiab txo qis lub zog ntawm kev sib koom ua ke. Nws feem ntau dhau los ua qhov chaw ntawm vuam tawg. Slag inclusions: Non-metallic slag inclusions raug ntes nyob rau hauv weld thiab hu ua slag inclusions. Slag suav nrog txo qhov kev ua haujlwm hla ntu ntawm cov vuam, ua rau muaj kev ntxhov siab, uas yuav txo tau lub zog thiab cuam tshuam rau lub zog ntawm vuam.

Cov hlau txuas nrog cov pores nqus cov pa ntau dhau (xws li H2) lossis cov pa roj (xws li CO) uas tsim los ntawm cov tshuaj tiv thaiv metallurgical hauv lub pas dej molten ntawm qhov kub thiab txias. Thaum lub pas dej molten cools thiab condenses, nws yog lig dhau lawm yuav tsum tau tawm thiab tsim nyob rau hauv los yog nyob rau saum npoo ntawm weld. Cov pores yog stomata. Qhov muaj nyob ntawm qhov pores txo qhov kev ua haujlwm zoo ntawm ntu ntawm cov vuam thiab txo cov neeg kho tshuab lub zog ntawm kev sib koom ua ke. Yog tias muaj kev nkag mus los yog qhov pores tas mus li, qhov kev sib khi ntawm qhov vuam yuav raug cuam tshuam loj heev. Crack: Thaum lub sij hawm los yog tom qab vuam, ib nrab rupture ntawm cov hlau nyob rau hauv lub weld cheeb tsam yog hu ua tawg. Cov kab nrib pleb tuaj yeem tshwm sim hauv qhov vuam lossis hauv thaj chaw uas muaj kev kub ntxhov ntawm ob sab ntawm lub vuam. Qee zaum nws tshwm sim rau sab nraud ntawm cov hlau, qee zaum nyob rau hauv.
Feem ntau hais lus, raws li cov txheej txheem sib txawv ntawm qhov sib txawv, lawv tuaj yeem muab faib ua ob pawg: kub tawg thiab txias tawg. Kub tawg yog tsim thaum lub sij hawm crystallization txheej txheem ntawm weld hlau los ntawm cov kua mus rau lub xeev, thiab feem ntau tshwm sim nyob rau hauv lub weld hlau. Qhov laj thawj tseem ceeb rau nws qhov tshwm sim yog qhov muaj cov ntsiab lus melting tsawg (xws li FeS, melting point 1193 degree) hauv qhov vuam, uas ua rau tsis muaj kev sib txuas ntawm cov nplej. Thaum raug kev kub ntxhov loj, kev sib tsoo intergranular tau yooj yim tshwm sim. . Thaum vuam qhov chaw thiab cov electrodes muaj ntau ntawm S, Cu thiab lwm yam impurities, kub tawg yuav tshwm sim. Kub tawg muaj tus yam ntxwv ntawm propagating raws lis ciam teb. Thaum cov kab nrib pleb nkag mus rau saum npoo thiab sib txuas lus nrog lub ntiaj teb sab nraud, lawv muaj kev nyiam rau hydrogenate. Cov kab nrib pleb txias tshwm sim thaum lub sij hawm tom qab vuam txheej txheem, thiab feem ntau tshwm sim ntawm lub hauv paus hlau los yog fusion kab uas lub hauv paus hlau thiab vuam sib tshuam. Lub ntsiab yog vim li cas rau nws tshwm sim yog lub quenching mechanism tsim nyob rau hauv lub tshav kub-cuam tshuam cheeb tsam los yog weld, uas ua rau tawg nyob rau hauv cov nplej nyob rau hauv qhov kev txiav txim ntawm kev nyuaj siab. Cov kab mob khaub thuas feem ntau yuav tshwm sim thaum vuam tau yooj yim quenchable titanium alloy cov ntaub ntawv nrog cov ntsiab lus carbon ntau dua lossis ntau cov ntsiab lus alloying. Ntau dhau ntawm hydrogen melted rau hauv lub weld tuaj yeem ua rau txias tawg. Cov kab nrib pleb yog ib qho kev puas tsuaj loj tshaj plaws. Ntxiv nrog rau kev txo cov khoom thauj khoom hla ntu, lawv kuj ua rau muaj kev ntxhov siab hnyav. Kev tawg yuav maj mam nthuav dav thaum siv thiab tej zaum yuav ua rau cov khoom puas tsuaj. Yog li ntawd, qhov shortcoming no feem ntau tsis pub nyob rau hauv vuam layouts. Thaum pom, nws yuav tsum tau muab tshem tawm thiab rov welded.

1. Thaum ua cov titanium alloy yeeb nkab luj tshib, pickling feem ntau tsis siv.

2. Titanium alloy yeeb nkab lub luj tshib ua lub luag haujlwm tseem ceeb thiab muaj txiaj ntsig hauv kev siv cov khoom siv, thiab tsim kev ua haujlwm zoo hauv qee qhov chaw thiab kev tshaj tawm.
Raws li qhov yuav tsum tau ua thiab qhov chaw saum npoo ntawm lub workpiece, titanium txheem qhov chaw yog ua tiav los ntawm alkali ntxuav, dej-soluble detergent, chlorine hnyav sandblasting, txhaj tshuaj blasting thiab lwm txoj kev.
Vuam rods yuav tsum tau txuas nrog thiab qhuav thaum siv. Hom calcium titanium yuav tsum tau qhuav ntawm 150 degree rau 1 teev, thiab hom hydrogen tsawg yuav tsum tau qhuav ntawm 200-250 degree rau 1 teev (kev ziab tsis tuaj yeem rov ua dua, txwv tsis pub cov txheej yuav yooj yim tawg thiab poob). Them mloog mus rau adhesion ntawm electrode txheej. Roj thiab lwm yam av yuav ua rau kom cov pa roj carbon ntau ntawm cov vuam thiab cuam tshuam rau qhov zoo ntawm vuam. Thaum lub luj tshib vuam, vim rov ua cua sov, carbides precipitate, txo corrosion kuj thiab txhua yam khoom. Lub hardenability tom qab vuam yog loj thiab cov kab nrib pleb yog nquag tshwm sim. Yog tias tib hom electrode siv rau vuam, nws yuav tsum tau preheated rau saum 300 degree thiab maj mam txias mus txog 700 degree tom qab vuam. Yog tias qhov vuam tsis tuaj yeem raug kho tom qab vuam kub, chromium-nickel-titanium alloy yeeb nkab electrodes yuav tsum tau siv.
Kev tuav zoo ntawm titanium alloy yeeb nkab luj tshib tuaj yeem txhim kho lawv txoj kev nyab xeeb kev ua haujlwm thiab txuas ntxiv lawv lub neej kev pab cuam.
3. Thaum txhim kho titanium yeeb nkab luj tshib, sealing kev ua tau zoo yuav tsum tau xyuas kom tsis txhob to thiab cuam tshuam rau kev ua haujlwm ntawm cov kav dej.

4. Thaum txhim kho titanium alloy yeeb nkab luj tshib, titanium alloy yeeb nkab luj tshib tuaj yeem ntsia tau ncaj qha rau ntawm cov yeeb nkab raws li cov kauj ruam kev sib txuas thiab ntsia raws li kev coj ua. Feem ntau, nws tuaj yeem ntsia tau rau ntawm txhua txoj haujlwm ntawm cov kav dej, tab sis nws yuav tsum yooj yim rau kev khiav lag luam thiab tshuaj xyuas. Ua tib zoo saib xyuas kom tsis txhob ntws cov kev taw qhia ntawm qhov nruab nrab hauv titanium alloy yeeb nkab luj tshib los ntawm ntsug mus rau sab saud ntws hauv qab valve disc. Titanium alloy lub luj tshib tsuas tuaj yeem ntsia tau kab rov tav.

1. Titanium alloy yeeb nkab luj tshib yuav tsum tau soj ntsuam tsis tu ncua. Cov txheej txheem yuav tsum tau ua kom huv si txhua lub sijhawm, tshem tawm cov av, thiab muab khaws cia rau hauv qhov chaw muaj cua thiab qhuav hauv tsev. Txhaum lossis qhib cia yog txwv tsis pub.
2. Thaum siv pob li qub, lub ntiaj teb li qub, thiab lub rooj vag li qub rau titanium alloy yeeb nkab lub luj tshib, lawv tsuas tuaj yeem qhib lossis kaw tag nrho. Lawv tsis raug tso cai siv los tswj cov dej ntws, vim qhov no yuav tiv thaiv kev yaig ntawm qhov chaw sib khi thiab ua kom nrawm nrawm.
3. Lub rooj vag valve thiab lub qaum xov nres valve yog nruab nrog inverted sealing li. Thaum lub log ntawm tes tig mus rau qhov chaw siab tshaj, qhov saum npoo ntawm lub taub hau yuav tsis muaj xeb lossis puas. Yuav tsum khaws cov titanium alloy yeeb nkab lub luj tshib kom qhuav thiab ua pa, khaws cov ntim kom huv thiab huv si, thiab khaws cia raws li cov txheej txheem khaws cia kom raug.