Thaum vuamtitanium phajthiabtitanium tubes, pores feem ntau ntsib teeb meem. Lub hauv paus ua rau ntawm qhov tsim ntawm pores yog tshwm sim los ntawm kev cuam tshuam ntawm hydrogen. Qhov tsim ntawm porosity nyob rau hauv cov hlau weld feem ntau cuam tshuam rau lub zog qaug zog ntawm kev sib koom tes. Hydrogen yog qhov laj thawj tseem ceeb rau kev tsim cov kab nrib pleb txias thiab qhov pores. Vim tias hydrogen tsawg dua 300 degree, solubility nyob rau hauv theem me heev, thiab qhov txwv solubility tsuas yog 0.002 feem pua ntawm chav tsev kub. Thaum lub vuam los yog cua sov cheeb tsam yog txias rau hauv qab 300 degree tom qab vuam, supersaturated hydrogen yog precipitated nyob rau hauv daim ntawv ntawm titanium hydride (theem).
Lub ntim nce thiab intergranular kev nyuaj siab yog generated. Txoj kev loj hlob ntawm qhov kev ntxhov siab no yuav ua rau intergranular microcracks, thiab intergranular microcracks yuav nthuav mus rau hauv cov kab nrib pleb nyob rau hauv qhov kev txiav txim ntawm kev ntxhov siab sab nraud. Thaum lub titanium phaj thiab lub titanium raj yog welded, muaj peev xwm ntawm kub tawg nyob rau hauv lub welded ob leeg yog heev me me. Qhov no yog vim hais tias cov ntsiab lus ntawm impurities xws li S, P, thiab C nyob rau hauv lub titanium phaj thiab titanium raj yog heev me me, thiab qhov tsawg melting point eutectic tsim los ntawm S thiab P yog tsis yooj yim. Pom nyob rau ntawm cov ciam teb, ua ke nrog qhov nqaim zoo crystallization kub ntau, qhov shrinkage ntawm titanium phaj thiab titanium raj me me thaum solidified, thiab cov hlau weld yuav tsis tsim kub tawg. Txawm li cas los xij, thaum titanium daim hlau thiab titanium raj yog welded, cov kab nrib pleb txias yuav tshwm sim hauv thaj chaw uas muaj kev kub ntxhov, uas yog qhov tshwm sim los ntawm qhov tseeb tias cov kab nrib pleb tshwm sim ob peb teev lossis ntev dua tom qab vuam, uas yog hu ua ncua kev tawg. Thaum lub sij hawm welding txheej txheem, hydrogen diffuses los ntawm high-temperature sib sib zog nqus pas dej ua ke mus rau lub qis-kub kub-kub cheeb tsam. Qhov nce ntawm cov ntsiab lus hydrogen nce tus nqi ntawm TiH2 precipitated nyob rau hauv cheeb tsam no, uas ua rau kom lub brittleness ntawm tshav kub-cuam tshuam cheeb tsam. Tsis tas li ntawd, vim lub ntim nthuav dav ntawm hydride nag lossis daus, cov ntaub so ntswg loj tau tshwm sim, ua ke nrog kev nthuav dav thiab sib sau ua ke ntawm hydrogen atoms mus rau qhov chaw muaj kev ntxhov siab hauv cheeb tsam, uas ua rau muaj cov kab nrib pleb.
Thaum vuam cov ntaub ntawv xws li titanium daim hlau thiab titanium raj, thaum kub siab tshaj 500 ~ 700 degree, nws yog ib qho yooj yim mus nqus oxygen, hydrogen thiab nitrogen nyob rau hauv cov huab cua, uas cuam tshuam rau lub vuam zoo. Yog li ntawd, thaum welding titanium alloys, lub weld cheeb tsam ntawm tag nrho cov molten pas dej ua ke thiab siab kub qhov chaw (siab tshaj 400 ~ 650 degree) yuav tsum nruj me ntsis tiv thaiv. Vim li no, kev tiv thaiv tshwj xeeb yuav tsum tau ua thaum vuam titanium daim hlau thiab titanium raj. Yog li ntawd, txoj kev ntawm argon arc welding yog saws, thiab ib tug welding torch nrog ib tug loj tsuag loj yog siv los nthuav lub cheeb tsam ntawm cov roj tiv thaiv cheeb tsam. Thaum lub nozzle tsis txaus los tiv thaiv cov hlau kub kub hauv qhov vuam seam thiab qhov chaw ze ntawm lub seam, yuav tsum tau ntxiv ib qho argon tiv thaiv cab npog.
Xaiv cov txheej txheem vuam kom raug kom tshem tawm tag nrho cov oxide nplai, roj thiab lwm yam khoom siv organic rau ntawm qhov chaw vuam thiab qhov chaw ntawm vuam hlau. Tswj cov ndlwg thiab ntws tus nqi ntawm argon roj los tiv thaiv turbulent flow thiab cuam tshuam cov nyhuv ntawm inflatable tiv thaiv. Nws muaj peev xwm siv phau ntawv tungsten argon arc vuam titanium alloy vuam los daws cov kab nrib pleb, thiab cov txiaj ntsig zoo tuaj yeem tau txais. Pre-welding npaj thiab groove xaiv yog:
(1) Kev xaiv cov khoom siv vuam. Lub purity ntawm argon yuav tsum tsis pub tsawg tshaj li 99.99 feem pua, lub lwg point yuav tsum nyob rau hauv qab no -40 degree, thiab cov txheeb ze av noo yuav tsum tsawg tshaj li 5 feem pua. Thaum lub siab nyob rau hauv lub tog raj kheej argon poob rau 0.981 MPa, nws yuav tsum tau nres. Cov xaim xaim feem ntau yog ua los ntawm cov khoom siv homogeneous. Txhawm rau txhim kho cov yas ntawm qhov sib koom ua ke, vuam hlau TC3, uas yog me ntsis qis dua lub hauv paus hlau alloy, tuaj yeem siv. Lub vuam hlau: TC3 yog siv rau qhov vuam no.
(2) Qhov zoo ntawm cov khoom siv vuam thiab vuam hlau muaj qhov cuam tshuam zoo rau cov khoom siv hluav taws xob ntawm cov khoom sib txuas. Daim ntawv xeem thiab vuam hlau tuaj yeem khaws tau ua ntej vuam. Yaug nrog dej huv thiab siv vuam tam sim ntawd tom qab ziab. Siv acetone, ethanol, carbon tetrachloride, methanol, thiab lwm yam los so qhov zawj ntawm titanium phaj thiab nws ob sab (hauv 50 hli feem), qhov chaw ntawm vuam hlau, thiab qhov chaw uas lub cuab yeej clip hu rau titanium phaj.
(3) Kev xaiv cov khoom siv vuam. Titanium phaj thiab titanium raj argon arc vuam yuav tsum siv lub DC argon arc vuam fais fab qhov chaw nrog txo cov yam ntxwv sab nraud thiab siab-frequency arc ignition, thiab lub sij hawm ncua roj hloov yuav tsum tsis pub tsawg tshaj 15s kom tsis txhob oxidation thiab muaj kuab paug thaum vuam. Yog li ntawd, WSM -315 IGBT inverter DC pulse argon arc vuam tshuab yog siv.
(4) Qhov kev xaiv ntawm groove daim ntawv. Nyob rau hauv txoj cai, txo tus naj npawb ntawm welded txheej thiab vuam hlau. Nrog rau qhov nce ntawm tus naj npawb ntawm cov txheej welded, qhov nqus nqus ntawm cov welded nce, uas cuam tshuam rau kev ua haujlwm ntawm kev sib koom ua ke. Tsis tas li ntawd, vim qhov loj ntawm lub vuam pas dej thaum lub titanium phaj thiab titanium raj yog welded, lub weldment yog them nrog V-shaped zawj ntawm 70 ~ 80 degree.
Tiv tauj peb kom paub ntau ntxiv. Ua tsaug
Nicole
Lub tuam txhab: Baoji Jimiyun Dynamic Co., Ltd
Tebchaws: Suav teb
Ntxiv: Baoti txoj kev, Jintai, Baoji nroog, Shaanxi, Suav teb
Cel: ntxiv rau 86 13369210920
Gmail:nicole@jmyunti.com
Lub Vev Xaib: www.jm-titanium.com
