Tungsten uye alloys ayo anogona kunyatsobatanidzwa negasi tungsten-arc welding,
gasi tungsten-arc braze welding, electron beam welding uye nekemikari vapor deposition.

Iyo weldability ye tungsten uye akati wandei alloys ayo akasanganiswa nearc casting, poda metallurgy, kana kemikari-vapor deposition (CVD) maitiro akaongororwa. Zvizhinji zvezvinhu zvakashandiswa zvainzi 0.060 in. gobvu sheet. Maitiro ekubatanidza akashandiswa aive (1) gasi tungsten-arc welding, (2) gasi tungsten-arc braze welding, (3) electron beam welding uye (4) kujoinha neCVD.
Tungsten yakakwenenzverwa nemhando dzese idzi asi ruzha rwewelds rwakakanganiswa zvakanyanya nemhando dzebase uye filler simbi (kureva hupfu kana arc-cast zvigadzirwa). Semuyenzaniso, mawelds muarc-cast material aive asina porosity nepo mawelds mupowder metallurgy products aiwanzove ane porous, kunyanya pamutsetse wefusion. Kune gasi tungsten-arc (GTA) welds mu 1/ 1r, in. unalloyed tungsten sheet, zvishoma preheat ye 150 ° C (iyo yakawanikwa kuva ductileto-brittle shanduko yekushisa kwesimbi yepasi) yakagadzira welds isina kuputika. Sesimbi dzepasi, tungsten-rhenium alloys aigoneka pasina preheat, asi porosity yaivewo dambudziko ne tungsten alloy poda zvigadzirwa. Preheating yairatidzika kunge isingakanganisi weld porosity iyo yaive yakanyanya basa remhando yesimbi yepasi.
Iyo ductile-to-brittle transition ternperatures (DBIT) yegasi tungsten-arc welds mumhando dzakasiyana dzehupfu metallurgy tungsten yaive 325 kusvika 475 ° C, kana ichienzaniswa ne150. arc-cast tungsten.
Braze welding ye tungsten ine dissimilar filler simbi sezviri pachena haina kuburitsa zvirinani zvivakwa zvakabatana kupfuura dzimwe nzira dzekujoinha. Isu takashandisa Nb, Ta, W-26% Re, Mo uye Re semasimbi ekuzadza mune mabraze welds. Nb neMo zvakakonzera kutsemuka kukuru.

Kubatana neCVD pa510 kusvika 560° C

yakabvisa zvese kunze kwehuwandu hudiki hweporosity uye zvakare yakabvisa matambudziko ane chekuita nekupisa kwakanyanya kunodiwa pakunama (senge zviyo zvakakura muweld uye nzvimbo dzakakanganiswa nekupisa).
Nhanganyaya
Tungsten uye tungsten-base alloys ari kutariswa kune akati wandei epamberi nyukireya uye nzvimbo maapplication anosanganisira thermionic inoshandura michina, mota dzinopindazve, tembiricha yemafuta emafuta uye zvimwe zvinobatika. Zvakanakira zvezvinhu izvi musanganiswa wavo wekunyanya kunyunguduka tembiricha, simba rakanaka patembiricha yakakwira, yakakwira yekupisa uye yemagetsi conductivities uye kudzivirira kwakakwana kune ngura mune dzimwe nzvimbo. Sezvo brittleness ichidzikamisa kugadzirwa kwavo, kubatsira kwezvishandiso izvi muzvikamu zvezvimiro pasi pemamiriro akaomesesa ebasa zvinoenderana zvakanyanya nekuvandudzwa kwemaitiro ekuwelda kuti ape majoini anofananidzwa mune zvivakwa kune base simbi. Naizvozvo, zvinangwa zvezvidzidzo izvi zvaive (1) kuona ma mechanic properties yemajoini anogadzirwa nenzira dzakasiyana dzekujoinha mumhando dzinoverengeka dzeulloyed uye alloyed tungsten; (2) ongorora mhedzisiro yekugadziriswa kwakasiyana-siyana mukupisa kurapwa uye nzira yekubatanidza; uye (3) ratidza kugona kwekugadzira bvunzo dzezvikamu zvakakodzera kune chaiwo maapplication.
Zvishandiso
Unalloyed tungsten m叮10 m. machira akakora ndiwo ainyanya kufarirwa. Iyo ulloyed tungsten muchidzidzo ichi yakagadzirwa nehupfu metallurgy, arc casting uye kemikari-vapor deposition maitiro. Tafura 1 inoratidza kusachena kwemazinga ehupfu simbi, CVD uye arc-cast tungsten zvigadzirwa sekugamuchirwa. Zvizhinji zvinowira mukati mezviyero zvinowanzowanikwa mu tungsten

asi zvinofanirwa kucherechedzwa kuti CVD zvinhu zvaive nezvakawanda kupfuura zvenorma] huwandu hwefluorine.
Saizi dzakasiyana-siyana uye maumbirwo e tungsten uye tungsten alloys akabatanidzwa kuenzanisa. Mazhinji acho aive ehupfu simbi zvigadzirwa kunyangwe zvimwe arc-yakakandwa zvinhu zvakaiswawo welded. Kurongeka kwakananga kwakashandiswa kuona kukwanisika kwezvivakwa zvekuvaka uye zvikamu. Ese matenals akagamuchirwa mune inotonhora yakazara yakashanda mamiriro kunze kweCVD tungsten, iyo yakagamuchirwa se-yakaiswa. Nekuda kwekuwedzera brittleness ye recrystallized uye hombe-grained tungsten zvinhu zvakashongedzwa mumamiriro ekushanda kuti kuderedze kukura kwezviyo munzvimbo yakabatwa nekupisa. Nekuda kwekudhura kwezvinhu uye huwandu hudiki huripo, takagadzira zviyedzo zvakashandisa huwandu hushoma hwezvinhu zvinoenderana nekuwana ruzivo rwaunoda.
Maitiro
Sezvo ductile-to-brittle transition tembiricha (DBTT) yetungsten iri pamusoro petembiricha yekamuri, kutarisisa kwakakosha kunofanirwa kushandiswa mukubata uye kugadzira kudzivirira kutsemuka1. Kuveura kunokonzeresa kutsemuka uye takaona kuti kugaya uye electrodischarge machining inosiya macheki ekupisa pamusoro. Kunze kwekunge zvabviswa nekupwanya, mitswe iyi inogona kupararira panguva yewelding uye kushandiswa kunotevera.
Tungsten, senge simbi dzese dzinoramba, dzinofanira kubatanidzwa mumhepo yakachena kwazvo yeinert gasi (gasi tungsten-arc process) kana vacuum (electron beam pro:::ess)2 kudzivirira kusvibiswa kweweld ne interstitials. Sezvo tungsten iine nzvimbo yepamusoro yekunyungudika pasimbi dzese (3410° C), midziyo yewelding inofanirwa kukwanisa kushingirira tembiricha yepamusoro.

Tafura 1

Matanho matatu akasiyana ekugadzira akashandiswa: gasi tungsten-arc welding, gasi tungsten-arc braze welding uye erekitironi beam welding. Welding mamiriro anodiwa kuti apedze pcnetration pane shoma simba rekuisa akatemerwa chinhu chimwe nechimwe. Asati apinza, sheet material yaigadzirwa kupinda mukati. maburi marefu uye akabviswa mafuta ne ethyl doro. The joint design yaive square groove isina midzi yekuvhurika.
Gasi Tungsten-Arc Welding
Yese otomatiki uye manyorero gasi tungsten-arc welds akagadzirwa mune ehamher yaichengetwa pazasi 5 x I kana. torr kweinenge 1 hr uye wobva wazadzwa neArgon yakachena kwazvo. Sezvinoratidzwa muFig. lA, kamuri yacho yakanga yakashongedzerwa nzira yekufamba uye musoro wetochi we otomatiki welding. Iyo workpiece yaive yakabatwa mumhangura yakapihwa tungsten inoisa panzvimbo dzese dzekusangana kuti irege kuvharidzirwa kubasa nekurova welding. Nheyo yegadziriro iyi yakaisa magetsi emagetsi emagetsi anopisa basa kusvika kune yaidiwa tembiricha, Fig. 1 B. All welds zvakaitwa pakufamba kukurumidza kubva 10 ipm, eurrent inenge 350 amp uye voltage ye10 kusvika 15 v. .
Gasi Tungsten-A『c Braze Welding
Gasi tungsten-ari mabraze welds akagadzirwa muember ine inert mhepo nehunyanzvi hwakafanana

avo vatsanangurwa pamusoro apa. Bead-onplate braze welds yakagadzirwa ne tungsten uye W-26% Re filler metal yakagadzirwa nemaoko; zvisinei, butt braze welds akaiswa welded otomatiki mushure mekunge simbi yekuzadza yakaiswa mujoini yebhut.
Electron Beam Welding
Iyo eleetron beam welds yakagadzirwa mumushini we150-kV 20-mA. Vacuum inosvika 5 x I o-6 torr yakachengetwa panguva yewelding. Electron beam welding inoguma nereshiyo yakakwirira kwazvo yehupamhi kusvika kuhupamhi uye nhete-inokanganiswa nekupisa nzvimbo.
』kudyiwa neChemical Vapor Disposition
Tungsten majoini akagadzirwa nekuisa isina alloyed tungsten filler simbi kuburikidza nemakemikari vapor deposition process3. Tungsten yakaiswa nehydrogen kuderedzwa kwe tungsten hexafluoride zvinoenderana nekuita-t
kupisa
WFs(g) + 3H,(g)一–+W(s) + 6HF(g).
Kushandiswa kweiyi nzira yekujoinha kunongoda shanduko diki muzvigadziriso uye reactant kuyerera kugovera. Mukana wekutanga wekuita uku pamusoro pedzimwe nzira dzakajairwa dzekujoinha ndewekuti, sezvo tembiricha yakadzikira inoshandiswa (510 kusvika 650 ° C) yakadzikira zvakanyanya pane inonyungudika.

tungsten (3410 ° C), recrystallization uye zvichibvira kuwedzera cmbrittlement yeyakagadzirwa tungsten base simbi netsvina kana kukura kwezviyo kunoderedzwa.
Madhizaini akati wandei anosanganisira butt uye machubhu-kupera kuvharwa akagadzirwa. Deposition yakaitwa nerubatsiro rwemhangura mandrel iyo yakashandiswa seyakagadziriswa, chidimbu chekugadzirisa uye substrate. Mushure mekuisa kwapera, iyo eopper mandrel yakabviswa ne etching. Sezvo rimwe basa ”yakaratidza kuti CVD tungsten ine zvinonetsa zvakasara sezvakaiswa, majoini aya aive stress relicvcd I hr pa1000 ° kusvika 1600 ° C isati yagadzirwa kana kuyedzwa.
Kuongorora uye Kuedzwa
Majoini akaongororwa nemaziso uye nemvura inopinza uye radiography asati aongororwa. Yakajairika welds yakaongororwa nekemikari yeokisijeni uye nitrogen (Table 2) uye yakawanda metallographic bvunzo dzakaitwa mukati mekudzidza.
Nekuda kwekureruka kwayo uye kuchinjika kune zvidiki zvidhori, bvunzo yekubhenda yakashandiswa seyakanyanya chiyero chekubatana kutendeseka uye eomparison yemaitiro. Ductile-tobrittle shanduko tembiricha yakatemwa neatatu-point bending apparatus yemajoini ese ari-welded uye mushure mekuchembera. Mucherechedzo wekutanga wemabhendi bvunzo yaive longitudinal

chiso chakakotama, 24t kureba ne 12t paupamhi, apo t ndiwo ukobvu hwemuenzaniso. Mienzaniso yakatsigirwa pane 15t span uye yakakotama ne plunger ye radius 4t pamwero we 0.5 ipm. Iyi geometry yaiwanzoita kuti data iwanikwe pahukobvu hwakasiyana hwezvinhu. Mienzaniso yaiwanzokotama yakachinjika kune weld seam (longitudinal bend specimen) kuti ipe yunifomu deformation ye weld, nzvimbo inobatwa nekupisa uye base simbi; zvisinei, zvienzaniso zvishomanana zvakakombama pamwe chete nemusono we weld (transverse bend specimen) kuenzanisa. Kukotama kwechiso kwakashandiswa muzvikamu zvekutanga zvekuferefeta; zvisinei, nekuda kwekamwe kacho kanowanikwa pafee dzemawelds mazhinji nekuda kwehuremu hwesimbi yakanyungudutswa, kubhenda kwemidzi kwakatsiviwa mukuedzwa kwakazotevera. Kurudziro yeMaterials Advisory Board6 ine chekuita nekubhenda kuyedzwa kwemapepa emifananidzo yakateverwa zvakanyanya sezvinobvira. Nekuda kwezvinhu zvishoma, zvidhori zvidiki zvinokurudzirwa zvakasarudzwa.
Kuti uone tembiricha yekuchinjika kwebend, iyo yekubhenda yakavharirwa muchoto inokwanisa kukurumidza kusimudza tembiricha kusvika 500 ° C. Bend ye90 kusvika 105 deg yakavharidzirwa bend yakazara. Iyo DBTT yakatsanangurwa seyakadzika tembiricha apo iyo speeimen yakakotama zvakazara pasina craeking. Kunyangwe bvunzo dzakaitwa mumhepo, kudzoreredzwa kwezvienzaniso hakuna kuoneka kudzamara tembiricha yekuyedza yasvika 400 ° C.

Mufananidzo 1

Mhinduro dze Unalloyed Tungsten
General Weldability
Gasi Turzgstea-Arc Welding-Mugasi tungsten-arc welding ye1乍in. gobvu risina kurongeka shizha, basa rinofanirwa kuve rakafayirwa zvakanyanya kudzivirira kutadza brittle pasi pekushushikana kunokonzerwa nekuvhunduka kwekushisa. Mufananidzo 2 unoratidza typic·al fracture inogadzirwa newelding pasina preheating chaiyo. Huru hwezviyo saizi uye chimiro che weld uye inopisa zone zvinoonekwa mukutyoka. Ongororo yepreheating ternperatures kubva mukamuri tembiricha kusvika 540°C yakaratidza kuti preheating kusvika kushoma 150°C kwaidiwa kuti kugadzikane kugadzirwa kwema one-pass butt welds ayo asina kutsemuka. Iyi tembiricha inoenderana neDBTI yesimbi yepasi. Preheating kune tembiricha yakakwira yaisaratidzika kuve yakakosha mune idzi bvunzo asi zvinhu zvine yakakwira DBTI, kana zvigadziriso zvinosanganisira zvakanyanya kushushikana kushushikana kana zvimwe zvikamu zvakakura, zvingada preheating kune yakakwirira ternperatures.
Hunhu hweweldment hunoenderana zvakanyanya nematanho anoshandiswa mukugadzira simbi dzepasi. Autogenous welds mu arc-cast tungsten yakasununguka kubva kune porosity, Fig.
3A, asi welds muupfu metallurgy tungsten inoratidzwa ne gross porosity, Fig. 3 (b), kunyanya pamwe chete nemutsara wekusanganiswa. Kuwanda kweporosity iyi, Fig. 3B, kunyanya pamwe ne3C, mune welds yakagadzirwa mune imwe nzvimbo, yakaderera porosity chigadzirwa (GE-15 yakabudiswa neGeneral Electric Co., Cleveland).
Gasi tungsten-arc welds muCVD tungsten ane zvisingawanzo kupisa-zvinokanganisa nzvimbo nekuda kwechimiro chezviyo 0£the base metaF. Mufananidzo 4 unoratidza chiso uye chinoenderana chikamu chemuchinjikwa chegasi tungsten-arc butt weld. Cherechedza kuti zviyo zvakanaka pa substrate pamusoro zvakakura nekuda kwekupisa kwewelding. Zvakare zvinoonekwa kushaikwa kwekukura kweiyo huru columnar

zviyo. Iyo columnar zviyo zvine gasi
bubb_les pamiganhu yezviyo zvinokonzerwa nefluorme tsvina8. Naizvozvo, kana
iyo yakanaka yezviyo substrate pamusoro inobviswa isati yatungidzirwa, iyo weldment haina metallographically inoonekwa yekupisa-inobatwa zone. Ehe, mune yakashanda CVD zvinhu (senge yakawedzera kana kudhonzwa tubing) iyo inopisa-yakakanganiswa nzvimbo yeweld ine yakajairika yakagadziridzwa zviyo chimiro.
Kutsemuka kwakawanikwa mumiganho yezviyo ye columnar muRAZ yeakawanda welds muCVD tungsten. Kuputika uku, kunoratidzwa muFig. 5, kwakakonzerwa nekukurumidza kuumbwa uye kukura kwemabhubhu mumiganhu yezviyo pahupamhi hwepamusoro9. Pakupisa kwepamusoro kunobatanidzwa mukutsvaira, mabhubhu akakwanisa kupedza nzvimbo yakawanda yemuganhu wezviyo; izvi, zvakasanganiswa nekunetseka kwakagadzirwa panguva yekutonhora, zvakadhonza miganhu yezviyo kuti iite mutswe. Ongororo yekuumbwa kwebubble mu tungsten uye mamwe simbi inoiswa panguva yekupisa kupisa inoratidza kuti mabhuru anoitika musimbi dzakaiswa pazasi 0.3 Tm (iyo homologous melting tembiricha). Ongororo iyi inoratidza kuti mabhubhu egasi anoumbwa nekubatanidzwa kwezvinzvimbo zvakavharirwa uye magasi panguva yekunyura. Panyaya yeCVD tungsten, gasi rinogona kunge riri fluorine kana fluoride compound
Electron Beam Welding—Unalloyed tungsten yakanga iri danda rerekitironi rakasungwa pamwe chete uye risina kutanga kupisa. Kudiwa kwe preheat kwakasiyana nemuenzaniso. Kuita kuti weld irege kutsemuka, preheating zvishoma kune DBTT yesimbi yepasi inokurudzirwa. Electron beam welds mune poda metallurgy zvigadzirwa zvakare ine weld porosity yakambotaurwa.

Gasi Tungsten-Arc Braze Welding一Mukuedza kuona kana simbi yesimbi inogona kushandiswa kubatsira, takaedza negasi tungstenarc maitiro ekugadzira simbi yesimbi paupfu metallurgy tungsten sheet, Masimbi ebraze akagadzirwa nekutanga kuisa simbi yekuzadza parutivi. butt joint before welding. Braze welds yakagadzirwa neNb isina kurongeka, Ta, Mo, Re, uye W-26% Re sesimbi dzekuzadza. Sezvingatarisirwa, paiva porosity panguva Fusion mutsetse mune metallographic zvikamu ose majoini (Fig. 6) sezvo hwaro simbi vaiva upfu metallurgy zvigadzirwa. Welds akagadzirwa ne niobium uye molybdenum filler masimbi akatsemuka.
Kuomarara kwewelds nebraze welds kwakafananidzwa nenzira yeongororo yebead-on-plate welds yakagadzirwa neunlloyed tungsten uye W 126% Re sesimbi yekuzadza. Iwo gasi tungstenarc welds uye braze welds akagadzirwa nemaoko pane unalloyed tungsten poda metallurgy zvigadzirwa (iyo yakaderera porosity, proprietary (GE-15) giredhi uye yakajairika giredhi rekutengesa). Welds uye braze welds mune yega yega zvinhu zvaive zvakura pa900, 1200, 1600 uye 2000 ° C yel, 10, 100 uye 1000 hr. Mienzaniso iyi yakaongororwa metallographically, uye kuomarara kuchinjika kwakatorwa kuyambuka weld, nzvimbo yakabatwa nekupisa, uye base simbi zvese se-weld uye mushure mekupisa kupisa.

Tafura 2

Mufananidzo2

Sezvo zvinhu zvakashandiswa muchidzidzo ichi zvaive zvigadzirwa zvehupfu, huwandu hwakasiyana hweporosity hwakanga huripo mune weld uye braze weld deposits. Zvekare, majoini akagadzirwa neyakajairwa simbi yehupfu tungsten base simbi yaive neporosity yakawanda kupfuura iyo yakagadzirwa neiyo low porosity, proprietary tungsten. Iyo braze welds yakagadzirwa neW-26% Re filler simbi yakanga ine porosity shoma pane maweld akagadzirwa nesimbi isina kusanganiswa tungsten filler.
Hapana mhedzisiro yenguva kana tembiricha yakaonekwa pakuoma kwema welds akagadzirwa neunalloyed tungsten sesimbi yekuzadza. Sezvakasungwa, kuyerwa kwekuoma kwesimbi uye base simbi zvaive zvakangogara uye hazvina kuchinja mushure mekukwegura. Zvisineyi, mabraze welds akaitwa neW-26% Re filler simbi aive akaomarara zvakanyanya sezvakagadzirwa pane base simbi (Fig. 7). Pamwe kuoma kwepamusoro kweW-Re br立e weld deposit kwakakonzerwa nekuomarara kwemhinduro uye/kana kuvapo kwechikamu chakagovaniswa zvakanaka muchimiro chakasimba. Iyo tungstenrhenium phase diagram11 inoratidza kuti nzvimbo dzenzvimbo dzepamusoro rhenium content dzinogona kuitika panguva yekutonhora nekukurumidza uye zvichikonzera kuumbwa kweiyo yakaoma, brittle er chikamu mune yakakamurwa zvakanyanya substructure. Pamwe chikamu cheer chakaparadzirwa zvakatsetseka muzviyo kana muganho wezviyo, kunyangwe pasina chaive chakakura zvakakwana kuti chizivikanwe nemetallographic kuongorora kana X-ray diffraction.
Kuomarara kwakarongwa sechinhambwe kubva kune braze-weld centre line kune dzakasiyana tembiricha dzekuchembera muFig. 7A. Cherechedza kuchinja kwakangoerekana kwaitika

mukuoma pamutsetse wefusion. Nekuwedzera kwekushisa kwekuchembera, kuoma kwebraze weld kwakadzikira kusvika, mushure me100 hr paJ 600 ° C, kuoma kwakafanana nekwesimbi isina kuiswa tungsten base. Iyi tsika yekudzikira kuomarara nekuwedzera tembiricha yakabata nguva dzese dzekuchembera. Kuwedzera nguva pakupisa kusingachinji kwakakonzerawo kuderera kwe simiJar mukuomarara, sezvakaratidzwa kune tembiricha yekuchembera ye1200 ° C muFig. 7B.
Kujoinha neChemical Vapor Deposition-Kujoinha tungsten neCVD matekiniki kwakaongororwa senzira yekugadzira welds mune akasiyana emuenzaniso magadzirirwo. Nekushandiswa kweakakodzera zvigadziriso uye masks kudzikamisa deposition kunzvimbo dzinodiwa, CVD uye poda metallurgy tungsten mapepa akabatanidzwa uye kupera kuvharwa pachubhu kwakagadzirwa. Deposition mubevel ine kona inosanganisirwa yeinenge 90 deg yakagadzira kutsemuka, Fig. 8A, pamharadzano dze columnar tsanga dzinokura kubva kune imwe chiso chebevel uye substrate (iyo yakatemwa kure). Zvisinei, kutendeseka kwepamusoro pasina kuputika kana kuumbwa kwakashata kwetsvina kwakawanikwa, Fig. 8B, apo kugadziriswa kwekubatana kwakashandurwa nekukuya chiso chesimbi yepasi kusvika kune radius ye 飞in. tangent kumudzi we weld. Kuratidza kushandiswa kwakajairwa kweichi chiitiko mukugadzirwa kwemafuta emafuta, mashoma ekupedzisira kuvhara akaitwa mu tungsten chubhu. Aya majoini aive akasimba-akasimba paakaedzwa nehelium mass spectrorr:eter leak detector.

Mufananidzo 3

Mufananidzo 4

Mufananidzo 5

Mechanical Properties
Bend Miedzo yeFusion Welds一Ductile-ku-brittle shanduko yekuchinja yakatemerwa kune akasiyana majoini mune isina alloyed tungsten. The curves muna Fig. 9 inoratidza kuti DBTT maviri poda metallurgy base masimbi aiva pamusoro I 50 ° C. Kazhinji, DBTT (yakaderera tembiricha apo 90 kusvika 105 deg bend aigona kuitwa) zvose zvinhu yakawedzera zvikuru pashure welding. . Matembiricha ekuchinja akawedzera kuita 175° C kusvika pakukosha kwe325°C yehupfu hwesimbi tungsten uye akawedzera anenge 235°C kusvika kuhukoshi hwe385°C nokuda kwepasi porosity, proprietary material. Musiyano muDBTTs we welded uye unwelded zvinhu zvakakonzerwa nehukuru hukuru hwezviyo uye zvinogona kugoverwazve kwehutsvina hwema welds uye nzvimbo dzinopisa. Mhedzisiro yebvunzo inoratidza kuti iyo DBTT yeyakajairika simbi simbi tungsten welds yaive yakaderera pane iyo yevaridzi zvinhu, kunyangwe iyo yekupedzisira yaive shoma porosity. Iyo yepamusoro DBTT yeweld mu low porosity tungsten inogona kunge yakakonzerwa nekukura kwayo kwezviyo zvakati kurei, Fig. 3A ne3C.
Mhedzisiro yeongororo yekuona DBTT's yehuwandu hwemajoini mune unalloyed tungsten inopfupikiswa muTafura 3. Mabhendi maedzo aive akanyanya kutarisisa kune shanduko yekuyedza maitiro. Midzi inokotama yairatidza kuve yakanyanyisa kudarika kubhenda kwechiso. Iyo yakanyatsosarudzwa yekuzorodza yekushushikana mushure mekushongedza yakaonekwa kudzikisa iyo DBTT zvakanyanya. Iyo CVD tungsten yaive, seyakasungwa, iyo yepamusoro DBTT (560 ℃);asi payakapihwa 1 hr stress relief ye1000 ℃ mushure mekunama, DBTT yayo yakadonha kusvika 350 ℃. kushungurudzika kwe1000 ° C mushure mekuputika, DBTT yayo yakadonha kusvika 350 ° C. Stress relief of arc welded powder metallurgy tungsten kwe 1 hr pa 18000 C yakaderedza DBTT yechinhu ichi ne100 ° C kubva pakukosha kwakatarwa kwaro se- welded. Kusununguka kwekunetseka kwe1 hr pa 1000 ° C pajojo yakagadzirwa neCVD nzira dzakabudisa DBTT yakaderera (200 ° C). Zvinofanira kucherechedzwa kuti, nepo shanduko yenguva iyi yaive yakadzikira zvakanyanya pane chero imwe tembiricha yekuchinja yakatarwa muchidzidzo ichi, kuvandudzwa kungangove kwakakonzerwa neiyo yakaderera strain rate (0.1 vs 0.5 ipm) yakashandiswa mukuedzwa pamajoini eCVD.

Bend Test ye braze welds-gasi tungsten-arc braze welds yakagadzirwa neNb. Ta, Mo, Re, uye W-26% Re semasimbi ekuzadza zvakare akabhenda akaedzwa uye mhedzisiro inopfupikiswa mutafura 4. iyo yakanyanya ductility yakawanikwa ne rhenium braze weld.

Kunyangwe mhedzisiro yeiyi cursory ongororo inoratidza kuti dissimilar filler simbi inogona kugadzira majoini ane mechanic zvinhu zvemukati kune mahomogeneous welds mu tungsten, mamwe emasimbi aya ekuzadza anogona kubatsira mukuita.

Mibairo yeTungsten Alloys.