Titanium Vuam: Shielding, Parameters thiab Weld Xim Tswj
Aug 12, 2025
Vim li cas titanium Vuam xav tau kev tswj tshwj xeeb
Titanium yog tshuaj lom neeg heev ntawm qhov kub thiab txias. Nyob rau hauv chav tsev kub nws yog kev tiv thaiv los ntawm ib tug ruaj khov passive oxide zaj duab xis, tab sis ib zaug cov hlau yog rhuab saum toj no roughly 400℃nws pib nqus oxygen, nitrogen, hydrogen thiab carbon los ntawm cov huab cua ntawm tus nqi uas nce siab nrog kub. Nyob rau hauv lub pas dej molten lub affinity muaj zog txaus uas tsis muaj kev tiv thaiv titanium hlau yuav oxidise thiab nitride nyob rau hauv vib nas this.
Qhov kev coj cwj pwm no yog vim li cas titanium vuam yog tswj hwm los ntawm huab cua tswj tsis yog los ntawm cov txheej txheem arc ib leeg. Titanium kuj tseem muaj cov thermal conductivity tsawg, yog li arc tshav kub nyob twj ywm nyob ze ntawm qhov vuam, thiab cov coefficient qis ntawm thermal expansion, uas txwv tsis pub muaj kev cuam tshuam thiab pab tsim kom huv si, suab pob qij txha thaum tiv thaiv txaus.
Yuav ua li cas Interstitial Elements Hloov Weld Properties
| Element | Qhov cuam tshuam rau qhov vuam | Tswj ntsuas |
|---|---|---|
| Oxygen | Interstitial solid tov, lattice distortion, siab zog thiab hardness tab sis qis ductility thiab toughness | Siab -purity shield gas, trailing shield, purse on the root side |
| Nitrogen | Cov nyhuv zoo sib xws nrog kev poob sai sai ntawm plasticity; nitrogen- nplua welds tig golden ces xiav | Tshem tawm cua ingress, saib xyuas cov pa purity ntawm lub teeb |
| Hydrogen | Kev poob qis hauv kev cuam tshuam toughness, hydride tsim, sib koom ua ke embrittlement | Degrease tag nrho, txwv hydrogen nyob rau hauv muab tub lim thiab puag hlau |
| Cov pa roj carbon | Kev ua kom muaj zog ntawm cov qib qis, tawv tawv carbides thiab tawg saum toj kawg nkaus ntawm solubility txwv | Tshem cov roj thiab roj, cap carbon ntawm qib txwv |
Vim tias cov pa oxygen thiab nitrogen nce hardness thaum rhuav tshem cov tawv, weld tsos yog cov txheej txheem siv tau: cov xim hloov ntawm cov nyiaj mus rau kub mus rau xiav rau grey lem ntawm cov pa paug absorbed. Cov qib titanium feem ntau txwv cov pa roj carbon monoxide rau 0.10% siab tshaj plaws, thiab cov khoom lag luam sib xws - qib purity tau tuav mus rau 0.08% siab tshaj plaws, yog li cov khoom siv thiab cov xaim xaim yuav tsum tsis muaj roj thiab cov cim ua ntej vuam.
Shielding Gas thiab Trailing Protection
Torch shielding ib leeg tsis txaus rau titanium. Lub pas dej welding yog tiv thaiv los ntawm lub teeb roj, tab sis cov hlaws khov kho thiab cov cua sov uas nyob ib sab - thaj chaw cuam tshuam nyob saum qhov chaw sib kis rau ob peb feeb tom qab lub arc dhau lawm. Lawv yuav tsum nyob rau hauv inert gas kom txog thaum lawv txias.
Siv argon ntawm 99.99% purity los yog zoo dua li cov roj teeb, cov pa roj thiab rov qab los yog ntxuav cov roj.
Haum cov ntaub thaiv npog uas ua raws li lub teeb thiab npog cov hlaws thiab cua sov- thaj tsam cuam tshuam ntawm ob sab.
Tshem tawm sab hauv ntawm cov yeeb nkab thiab cov hlab ntsha pob qij txha kom txog thaum cov pa oxygen seem nyob rau hauv qhov qis ib lab ntau.
Txheeb xyuas cov dej dew point thiab ntws tus nqi ntawm qhov hluav taws xob, thiab tsis txhob muaj kev kub ntxhov uas ua rau huab cua nkag mus rau hauv daim ntaub thaiv.
Tsis txhob cia lub arc tawg nrog cov electrode tseem kub thiab raug; ncej- ntws yuav tsum txuas ntxiv tom qab lub arc raug tua.
Kev sib koom ua ke thiab ntxuav ua ntej vuam
Kev huv huv tsis yog xaiv tau. Oxide nplai, txiav cov kua dej, cov ntiv tes, cov cim cim thiab cov tshuab ua haujlwm txhua tus qhia cov pa roj carbon, hydrogen lossis oxygen rau hauv qhov vuam.
Npaj weld bevels los ntawm machining ntau dua li kev sib tsoo, kom tsis muaj cov khoom abrasive lossis cov kab mob sib kis nyob hauv lub ntsej muag.
Degrease nrog cov kuab tshuaj tsim nyog, tom qab ntawd tshem tawm cov oxide txheej los ntawm stainless hlau hlau txhuam los yog kua qaub ntxuav, thiab so qhuav.
Kov cov pob qij txha npaj nrog cov hnab looj tes huv si nkaus xwb; tsis txhob siv tib cov cuab yeej uas tau siv rau ntawm cov hlau.
Khaws cov xaim xaim nyob rau hauv nws cov ntim thawj kom txog thaum tam sim ntawd ua ntej siv thiab so nws ua ntej noj.
Filler hlau yog xaiv los ntawm AWS A5.16 kev faib tawm, piv txwv li ERTi-2 rau Qib 2 lub hauv paus hlau lossis ERTi-5 rau Ti-6Al-4V, thiab yuav tsum tau ua kom haum rau qib hlau hauv paus thiab rau qhov yuav tsum tau muaj zog thiab ductility ntawm kev sib koom tes.
Welding Parameters thiab Arc xyaum
Titanium feem ntau welded los ntawm roj tungsten arc vuam nrog ncaj qha tam sim no electrode tsis zoo, los yog los ntawm plasma arc, electron nqaj lossis laser txheej txheem rau kev ua haujlwm ntau lawm. Cov kev cai tseem ceeb yog ua raws li tag nrho cov ntawm lawv: tsis tshua muaj cua sov input, tsis muaj weaving, tsis muaj ntau dhau mus txawv teb chaws ceev variation, thiab nruam shielding.
| Xyaum | Kev pom zoo |
|---|---|
| Arc pib | Siv siab - zaus arc pib; Tsis txhob ntaus lub arc ntawm lub workpiece sab nraum qhov sib koom ua ke |
| Tack vuam | Zam qhov twg ua tau, lossis ua kom puv -tacks uas yuav tau noj los ntawm qhov kawg weld |
| Vuam txoj hauj lwm | Downhand los yog txoj hauj lwm tiaj tus qhov kev sib koom tsim tso cai |
| Kub input | Khaws qis, nrog stringer hlaws thiab me me weaving |
| Interpass kub | Tso cai kom poob ua ntej qhov kev hla dhau mus tom ntej tso |
| Hluav taws xob | Thoriated los yog ceriated tungsten, raug hauv av thiab tsis kis kab mob los ntawm kev sib cuag nrog lub pas dej |
Arc ntaus, spatter thiab hloov pauv sai sai hauv kev mus ncig ceev txhua qhov tsim kom muaj kev sib kis hauv zos lossis tsis sib xws. Yog tias qhov sib koom ua ke yuav tsum tau rov ua dua, qhov ua tiav ib nrab ntawm cov weld yuav tsum tseem tiv thaiv kom txog thaum nws tau txias hauv qab ntawm qhov pib oxidation.
Tshaj tawm -Kev kho cua sov thiab Weld xim txais
Tom qab-weld kev kho cua sov yuav tsum tau zam thaum twg tus qauv tso cai, vim hais tias ib lub voj voog thermal ua rau muaj kev pheej hmoo ntawm kev kis kab mob ntxiv thiab kev loj hlob ntawm cov nplej. Yog tias yuav tsum tau muaj kev ntxhov siab, qhov kub thiab txias feem ntau yog qis dua 650℃thiab lub qhov cub cua yuav tsum yog lub tshuab nqus tsev lossis siab - purity inert gas. Lub workpiece yuav tsum huv si ua ntej nws nkag mus rau hauv lub qhov cub, vim cov roj residual yuav decompose thiab deposit carbon.
Weld xim yog tus qauv ua ntej - kab kev lees paub ntawm titanium fabrications. Cov kab ke khiav los ntawm nyiaj -dawb, lub ntsiab lus tsis muaj oxidation, los ntawm lub teeb straw, ces tob straw thiab xiav, rau grey los yog dawb, lub ntsiab lus hnyav oxidation. Nyiaj thiab lub teeb straw welds qhia tau tias muaj kev tiv thaiv. Cov khib nyiab sib sib zog nqus tuaj yeem raug zam rau qhov tsis yog - cov haujlwm tseem ceeb. Cov xim xiav thiab grey qhia tias muaj cov kab mob sib kis, tawv thiab nkig, thiab cov pob qij txha no feem ntau raug tshem tawm thiab rov ua dua -welded es tsis txais.
Kev txhawb nqa cov tshev suav nrog kev nyuaj ntawm kev hla cov vuam thiab cua sov- thaj tsam cuam tshuam, khoov kev sim, kev kuaj hluav taws xob lossis kev nkag mus ntawm qhov sib koom ua tiav, thiab, rau cov cuab yeej siv siab, kev ntsuas siab xav tau los ntawm txoj cai tsim kho.
FAQ
Q: Vim li cas titanium weld xim tseem ceeb heev?
Xim qhia txog oxidation: nyiaj txhais tau hais tias raug thaiv, kub los yog straw qhia me ntsis oxidation, thiab xiav los yog grey qhia tias hnyav paug nrog txo ductility thiab toughness.
Q: Dab tsi purity ntawm shielding gas xav tau rau titanium vuam?
Argon ntawm 99.99% purity los yog zoo dua yog siv rau lub teeb, trailing thiab backing gas, nrog rau sab hauv ntawm lub sib koom purged mus rau ib tug heev tsawg residual oxygen theem.
Q: Yuav tsum titanium weld bevels hauv av los yog machined?
Bevels yog machined, tsis yog hauv av, yog li ntawd cov khoom abrasive thiab embedded paug tsis tau nqa mus rau hauv kev sib koom ua ke.
Q: Puas yog tom qab-weld kev kho cua sov xav tau ntawm titanium?
Nws raug zam qhov twg daim ntawv thov tso cai; Thaum muaj kev cuam tshuam kev ntxhov siab, qhov ntsuas kub ib txwm khaws cia qis dua li 650℃hauv lub tshuab nqus tsev lossis inert cua.
Q: Cov hlau muab tub lim twg yog siv rau Ti-6Al-4V?
ERTi-5 muab tub lim rau AWS A5.16 kev faib ua ke sib tw Ti-6Al-4V puag hlau, thaum tsis muaj kev sib koom ua ke Qib 2 feem ntau siv ERTi-2.
Q: Yuav ua li cas yog tias titanium absorbs hydrogen thaum vuam?
Kev cuam tshuam toughness poob qis thiab hydride tsim embrittles qhov sib koom ua ke, uas yog vim li cas hydrogen txwv thiab ua tiav degreasing yog ob qho tib si ua ntej vuam.
