Porosity yog cov kab noj hniav tsim thaum cov npuas hauv lub pas dej molten tsis khiav thaum lub sij hawm khov kho thaum vuam. Thaum vuam nrog J507 alkaline electrode, feem ntau muaj nitrogen pores, hydrogen pores thiab CO pores. Lub tiaj vuam txoj hauj lwm muaj qhov pores ntau dua li lwm txoj haujlwm; muaj ntau lub hauv paus txheej dua li sau thiab npog qhov chaw; muaj qhov ntev arc vuam ntau dua li luv arc vuam; muaj kev cuam tshuam arc vuam ntau dua li qhov nruam arc vuam; thiab muaj ntau qhov pib arc, arc kaw thiab qhov chaw sib koom ua ke dua li vuam. Muaj ntau lwm txoj haujlwm los xaws. Qhov muaj nyob ntawm qhov pores yuav tsis tsuas yog txo qhov ntom ntawm cov weld thiab ua kom tsis muaj zog ntawm qhov chaw hla ntawm qhov vuam, tab sis kuj txo lub zog, plasticity thiab toughness ntawm cov vuam. Raws li cov yam ntxwv ntawm kev hloov pauv ntawm J507 vuam pas nrig, peb xaiv lub vuam fais fab, qhov tsim nyog vuam tam sim no, tsim nyog arc pib thiab kaw, kev ua haujlwm luv luv, kev thauj mus los ntawm tus pas nrig thiab lwm yam los tswj, thiab tau txais kev lees paub zoo hauv vuam ntau lawm. .
1. Tsim cov stomata
Molten hlau dissolves ib tug loj npaum li cas ntawm cov roj nyob rau hauv high kub. Raws li qhov kub thiab txias, cov pa roj no maj mam khiav tawm ntawm qhov vuam hauv daim ntawv ntawm npuas. Cov roj uas tsis muaj sij hawm khiav tawm tseem nyob hauv qhov vuam thiab tsim cov pores. Cov pa roj uas tsim cov pores feem ntau suav nrog hydrogen thiab carbon monoxide. Los ntawm kev faib cov stomata, muaj ib lub stomata, nruam stomata, thiab ntom stomata; los ntawm qhov chaw ntawm stomata, lawv tuaj yeem muab faib ua cov stomata sab nraud thiab sab hauv stomata; los ntawm cov duab, muaj pinholes, round stomata, thiab strip stomata (lub stomata yog strip-worm-puab), uas yog nruam puag ncig pores), chain-zoo li thiab honeycomb pores, thiab lwm yam. Rau tam sim no, nws yog ntau tshaj rau J507. electrodes los tsim pore tsis xws luag thaum vuam. Yog li ntawd, kev siv cov vuam ntawm cov hlau tsis tshua muaj hlau nrog J507 electrode ua piv txwv, qee qhov kev sib tham tau tsim los ntawm kev sib raug zoo ntawm qhov ua rau ntawm qhov pore tsis xws luag thiab cov txheej txheem vuam.
2.Cov yam ntxwv ntawm J507 vuam qws droplet hloov
J507 welding pas nrig yog qhov qis-hydrogen vuam pas nrig nrog siab alkalinity. Qhov no vuam pas nrig yuav siv tau ib txwm thaum lub DC vuam tshuab thim rov qab polarity. Yog li ntawd, tsis muaj teeb meem dab tsi ntawm DC vuam tshuab siv, qhov hloov pauv hloov pauv yog los ntawm thaj chaw anode mus rau thaj tsam cathode. Nyob rau hauv dav dav phau ntawv arc vuam, qhov kub ntawm qhov chaw cathode yog me ntsis qis dua qhov kub ntawm thaj tsam anode. Yog li ntawd, tsis muaj teeb meem dab tsi ntawm daim ntawv hloov pauv, qhov ntsuas kub yuav txo qis tom qab cov tee dej mus txog thaj tsam cathode, ua rau cov tee dej ntawm hom electrode thiab hloov mus rau hauv lub pas dej molten, uas yog, daim ntawv hloov pauv ntawm cov dej ntxhib tau tsim. . Txawm li cas los xij, vim hais tias phau ntawv arc vuam yog ib qho tseem ceeb ntawm tib neeg: xws li kev txawj ntse ntawm lub vuam, qhov loj ntawm qhov tam sim no thiab qhov hluav taws xob, thiab lwm yam, qhov loj ntawm cov tee dej kuj tsis sib npaug, thiab qhov loj ntawm lub pas dej molten tsim kuj tsis sib xws. . Yog li ntawd, qhov tsis xws luag xws li pores yog tsim nyob rau hauv kev cuam tshuam ntawm sab nraud thiab sab hauv. Nyob rau tib lub sijhawm, alkaline electrode txheej muaj ntau cov fluorite, uas decomposes fluorine ions nrog lub siab ionization muaj peev xwm nyob rau hauv qhov kev txiav txim ntawm arc, ua rau arc stability tsis zoo thiab ua rau tsis ruaj khov hloov pauv thaum lub sij hawm vuam. yam. Yog li ntawd, txhawm rau daws qhov teeb meem porosity ntawm J507 electrode phau ntawv arc vuam, ntxiv rau kom qhuav cov electrode thiab ntxuav qhov zawj, peb kuj yuav tsum pib nrog kev ntsuas thev naus laus zis los xyuas kom muaj kev ruaj ntseg ntawm arc droplet hloov.
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3. Xaiv lub vuam fais fab los xyuas kom ruaj khov arc
Txij li thaum J507 electrode txheej muaj fluoride nrog lub peev xwm ionization siab, uas ua rau tsis muaj kev ruaj ntseg hauv cov roj arc, nws yog ib qho tsim nyog los xaiv qhov tsim nyog vuam fais fab. DC vuam fais fab qhov chaw peb feem ntau siv tau muab faib ua ob hom: teb DC arc vuam tshuab thiab silicon rectifier DC vuam tshuab. Txawm hais tias lawv cov yam ntxwv nkhaus sab nraud yog txhua tus yam ntxwv nqis los, vim tias lub tshuab DC arc vuam ua tiav lub hom phiaj ntawm kev kho los ntawm kev txhim kho cov kev xaiv commutating ncej, nws cov zis tam sim no waveform viav vias nyob rau hauv ib tug tsis tu ncua zoo li qub, uas yog khi ua ib tug macroscopic phenomenon. Rated tam sim no, microscopically, cov zis tam sim no hloov nrog me me amplitude, tshwj xeeb tshaj yog thaum cov tee hloov pauv, ua rau lub viav vias amplitude nce. Silicon rectified DC vuam tshuab cia siab rau cov khoom siv silicon rau kev kho thiab lim dej. Txawm hais tias cov zis tam sim no muaj cov ncov thiab hav, nws feem ntau yog du, los yog muaj ib qho me me ntawm viav vias nyob rau hauv ib qho txheej txheem, yog li nws tuaj yeem txiav txim siab tsis tu ncua. Yog li ntawd, nws tsis tshua muaj kev cuam tshuam los ntawm kev hloov pauv hloov pauv, thiab qhov hloov pauv tam sim no tshwm sim los ntawm kev hloov pauv hloov pauv tsis loj. Hauv kev ua haujlwm vuam, nws tau txiav txim siab tias silicon rectifier vuam tshuab muaj qhov ua tau qis dua ntawm qhov pores dua li lub tshuab DC arc vuam. Tom qab soj ntsuam cov txiaj ntsig kev xeem, nws ntseeg tau tias thaum siv J507 electrodes rau vuam, silicon khoom vuam tshuab ntws vuam fais fab yuav tsum raug xaiv, uas tuaj yeem ua kom ruaj khov arc thiab zam qhov tshwm sim ntawm qhov tsis xws luag.
4. Xaiv qhov tsim nyog vuam tam sim no
Vim yog J507 electrode vuam, cov electrode kuj muaj ntau cov ntsiab lus ntawm cov hlau alloy nyob rau hauv cov tub ntxhais weld ntxiv rau cov txheej los txhim kho lub zog ntawm qhov sib koom ua ke thiab tshem tawm qhov muaj peev xwm ntawm qhov tsis xws luag. Vim yog siv cov vuam tam sim no loj dua, lub pas dej molten yuav ntxaum, cov tshuaj tiv thaiv metallurgical yog khaus, thiab cov ntsiab lus alloy yog kub hnyiab heev. Vim tias qhov tam sim no loj dhau lawm, qhov kev tiv thaiv tshav kub ntawm cov tub ntxhais vuam yuav pom tseeb nce ntxiv, thiab cov electrode yuav tig liab, ua rau cov organic teeb meem hauv electrode txheej kom decompose ntxov ntxov thiab tsim pores; thaum lub caij tam sim no me dhau. Lub crystallization ceev ntawm lub pas dej molten yog ceev heev, thiab cov roj hauv lub pas dej molten tsis muaj sij hawm los khiav, ua rau lub qhov hws. Tsis tas li ntawd, DC thim rov qab polarity yog siv, thiab qhov kub ntawm qhov chaw cathode yog qhov qis. Txawm hais tias cov hydrogen atoms generated thaum lub sij hawm hnyav cov tshuaj tiv thaiv yog yaj nyob rau hauv lub molten pas dej ua ke, lawv yuav tsis tau sai hloov los ntawm cov ntsiab lus alloy. Txawm hais tias cov roj hydrogen sai sai ntab tawm ntawm qhov vuam, cov dej yaj lub pas dej ua ke yog overheated thiab tom qab ntawd txias sai heev, ua rau cov seem hydrogen-forming molecules kom solidify nyob rau hauv lub pas dej molten weld los tsim pore defects. Yog li ntawd, nws yog ib qho tsim nyog yuav tau xav txog qhov tsim nyog vuam tam sim no. Tsawg-hydrogen welding rods feem ntau muaj cov txheej txheem me me tam sim no ntawm li 10 mus rau 20% tshaj li cov kua qaub welding rods ntawm tib qhov tshwj xeeb. Nyob rau hauv kev xyaum ntau lawm, rau qis-hydrogen vuam pas nrig, lub square ntawm txoj kab uas hla ntawm vuam pas nrig multiplied los ntawm kaum yuav siv tau raws li cov ntaub ntawv tam sim no. Piv txwv li, Ф3.2mm electrode tuaj yeem teeb tsa ntawm 90 ~ 100A, thiab Ф4.0mm electrode tuaj yeem teeb tsa ntawm 160 ~ 170A raws li qhov siv tam sim no, uas tuaj yeem siv los ua lub hauv paus rau kev xaiv cov txheej txheem los ntawm kev sim. Qhov no tuaj yeem txo qhov kub hnyiab ntawm cov ntsiab lus alloy thiab zam kom tsis txhob muaj qhov pores.
5. Tsim nyog arc pib thiab kaw
J507 electrode vuam pob qij txha muaj feem yuav tsim pores tshaj lwm qhov chaw. Qhov no yog vim qhov kub ntawm cov pob qij txha feem ntau qis dua lwm qhov thaum lub sij hawm vuam. Vim hais tias qhov kev hloov ntawm ib tug tshiab welding pas nrig tau ua rau kub dissipation rau ib lub sij hawm ntawm lub qub arc kaw taw tes, tej zaum kuj yuav muaj corrosion hauv zos nyob rau hauv lub kawg ntawm lub tshiab welding pas nrig, uas ua rau ntom pores nyob rau hauv lub sib koom tes. Txhawm rau daws qhov tsis xws luag los ntawm qhov no, ntxiv rau qhov pib ua haujlwm Ntxiv rau kev txhim kho qhov tsim nyog arc-pib phaj ntawm arc-pib kawg, ntawm txhua qhov sib koom ua ke hauv nruab nrab, maj mam txhuam qhov kawg ntawm txhua qhov tshiab electrode ntawm arc. -pib phaj pib lub arc kom tshem tawm cov xeb ntawm qhov kawg. Ntawm txhua qhov sib koom ua ke hauv nruab nrab, yuav tsum tau siv cov txheej txheem ntawm kev sib tw arc siab heev, uas yog, tom qab lub arc raug ntaus 10 mus rau 20 mm nyob rau hauv pem hauv ntej ntawm lub weld thiab ruaj khov, nws yog ces rub rov qab mus rau lub arc kaw taw tes ntawm lub arc. sib koom ua ke kom tus thawj arc kaw taw tes tuaj yeem ua kom sov hauv zos kom txog thaum lub yaj tsim. Tom qab pooling, txo lub arc thiab viav vias me ntsis nce thiab nqis 1-2 zaug kom weld ib txwm. Thaum kaw lub arc, lub arc yuav tsum tau ceev kom luv li sai tau los tiv thaiv lub pas dej molten los ntawm kev sau cov arc crater. Siv arc teeb pom kev zoo los yog viav vias rov qab thiab tawm 2-3 zaug los ua kom tiav cov arc crater kom tshem tawm cov pores tsim ntawm qhov kaw arc.
6. Kev ua haujlwm luv luv arc thiab linear txav
Feem ntau, J507 vuam rods hais txog kev siv luv luv arc ua haujlwm. Lub hom phiaj ntawm kev ua haujlwm luv luv yog los tiv thaiv lub pas dej ua ke kom cov dej daws hauv lub xeev kub kub kub yuav tsis raug cuam tshuam los ntawm huab cua sab nraud thiab tsim cov pores. Tab sis nyob rau hauv dab tsi lub xeev lub luv luv arc yuav tsum tau khaws cia, peb xav tias nws nyob ntawm cov welding rods ntawm txawv specifications. Feem ntau luv luv arc hais txog qhov kev ncua deb ntawm qhov ntev arc tswj mus rau 2/3 ntawm txoj kab uas hla ntawm vuam pas nrig. Vim tias qhov kev ncua deb me me dhau lawm, tsis tsuas yog lub pas dej daws teeb meem tsis tuaj yeem pom tau meej, tab sis nws kuj nyuaj rau kev khiav lag luam thiab tuaj yeem ua rau luv luv Circuit Court thiab arc tawg. Tsis yog siab dhau lossis qis dhau tuaj yeem ua tiav lub hom phiaj ntawm kev tiv thaiv lub pas dej. Nws raug nquahu kom thauj cov strips hauv txoj kab ncaj nraim thaum thauj cov strips. Kev sib tw rov qab ntau dhau yuav ua rau muaj kev tiv thaiv tsis zoo ntawm lub pas dej ua ke. Rau cov thicknesses loj (xa mus rau ≥16mm), qhib U-shaped lossis ob chav U-shaped zawj tuaj yeem siv los daws qhov teeb meem. Thaum lub sij hawm npog welding, multi-pass welding kuj tseem siv tau los txo qhov viav vias ntau. Cov txheej txheem saum toj no tau txais los ntawm kev siv vuam ntau lawm, uas tsis yog tsuas yog ua kom lub cev zoo xwb tab sis kuj ua kom du thiab huv si weld hlaws.
Thaum ua haujlwm J507 electrodes rau vuam, ntxiv rau cov txheej txheem saum toj no ntsuas los tiv thaiv qhov pores, qee cov txheej txheem kev cai tsis tuaj yeem tsis quav ntsej. Piv txwv li: ziab cov welding pas nrig kom tshem tawm cov dej thiab roj, txiav txim siab thiab ua cov zawj, thiab qhov chaw hauv av kom zoo los tiv thaiv arc deflection los ntawm ua rau lub qhov hws, thiab lwm yam. Tsuas yog los ntawm kev tswj cov txheej txheem ntsuas raws li cov yam ntxwv ntawm cov khoom, peb yuav yog muaj peev xwm txo tau thiab zam qhov pore tsis xws luag.
Post lub sij hawm: Nov-01-2023
