Pores yog qhov tsim thaum cov npuas hauv lub pas dej ua ke tsis khiav tawm thaum lub sij hawm khov kho thaum vuam. J507 yooj yim vuam pas nrig feem ntau yog nitrogen, hydrogen thiab CO pores. Muaj ntau qhov pores nyob rau hauv lub tiaj vuam txoj hauj lwm dua nyob rau hauv lwm txoj hauj lwm. Cov txheej hauv qab yog ntau tshaj qhov sau thiab npog; Ntev arc vuam yog ntau tshaj qhov luv arc vuam. Broken arc vuam yog ntau tshaj qhov nruam arc vuam. Arc pib, arc kaw thiab sib koom ua ke yog ntau dua li lwm txoj haujlwm ntawm cov vuam. Vim tias muaj qhov pores, nws yuav tsis tsuas yog txo qhov ntom ntawm cov vuam, ua kom tsis muaj zog ntawm qhov chaw seem ntawm qhov vuam, tab sis kuj txo lub zog, plasticity thiab toughness ntawm vuam. Raws li cov yam ntxwv ntawm J507 vuam pas nrig hloov pauv, xaiv vuam fais fab mov, qhov tsim nyog vuam tam sim no, tsim nyog arc pib thiab kaw, kev ua haujlwm luv luv, kev thauj mus los thiab lwm yam ntawm kev tswj, vuam ntau lawm tau txais kev lees paub zoo.
1. Tsim cov stomata
Molten hlau dissolves ib tug loj npaum li cas ntawm cov roj nyob rau hauv high kub, thiab nrog rau qhov kub thiab txias, cov gases maj mam khiav tawm ntawm lub weld nyob rau hauv daim ntawv ntawm cov npuas, thiab cov roj uas yog lig dhau lawm khiav tawm nyob rau hauv lub weld tsim pores. Lub ntsiab gases uas tsim pores yog hydrogen thiab carbon monoxide. Los ntawm kev faib cov stomata, muaj ib lub stomata, nruam stomata thiab ntom stomata. Lub stomata tuaj yeem muab faib ua stomata sab nraud thiab sab hauv stomata raws li qhov sib txawv ntawm stomata. Los ntawm cov duab, muaj pinholes, round stomata, strip stomata (stomata nyob rau hauv cov duab ntawm bar worm, yog ib tug nruam round stomata), saw thiab honeycomb stomata. Tam sim no, nws yog ntau dua rau J507 electrode los tsim porosity tsis xws luag thaum vuam. Yog li ntawd, noj J507 electrode welding ntawm cov pa roj carbon tsawg yog piv txwv, kev sib raug zoo ntawm qhov ua rau porosity defects thiab vuam tshuab yog tham txog.
2. Cov yam ntxwv ntawm kev hloov pauv hloov ntawm J507 electrode
J507 electrode yog lub siab alkalinity tsawg hydrogen hom electrode, cov electrode tuaj yeem siv tau ib txwm siv thaum rov qab polarity ntawm DC vuam tshuab. Yog li ntawd, tsis muaj teeb meem dab tsi ntawm DC welder siv, qhov hloov pauv hloov pauv yog los ntawm thaj av anode mus rau thaj tsam cathode. Nyob rau hauv dav dav phau ntawv arc vuam, qhov kub ntawm thaj tsam cathode yog me ntsis qis dua li ntawm thaj tsam anode. Yog li ntawd, tsis muaj teeb meem dab tsi ntawm daim ntawv hloov pauv tau yaj mus rau hauv thaj av cathode, qhov kub thiab txias yuav raug txo, uas ua rau kev hloov pauv ntawm polymerization ntawm txhua qhov kev daws teeb meem ntawm cov electrode mus rau hauv lub pas dej ua ke, uas yog, tsim cov tshuaj crude hloov pauv. daim ntawv. Txawm li cas los xij, vim hais tias phau ntawv arc vuam yog ib qho tseem ceeb ntawm tib neeg: xws li kev ua tau zoo ntawm cov welder, qhov loj ntawm qhov tam sim no thiab qhov hluav taws xob sib txawv, qhov loj ntawm cov tshuaj poob kuj tsis sib npaug, thiab qhov loj ntawm cov dej hauv pas dej ua ke kuj tsis sib xws. Yog li ntawd, nyob rau hauv kev cuam tshuam ntawm sab nraud thiab sab hauv, pores thiab lwm yam tsis xws luag yog tsim. Nyob rau tib lub sijhawm, muaj ntau cov fluorite nyob rau hauv cov txheej txheem ntawm cov electrode, uas rhuav tshem cov fluorine ions nrog siab ionization muaj peev xwm nyob rau hauv qhov kev txiav txim ntawm lub arc, uas ua rau lub stability ntawm lub arc tsis zoo, thiab ces ua rau instability. ntawm kev hloov pauv hloov thaum lub welding. Yog li ntawd, txhawm rau daws qhov teeb meem stoma ntawm J507 electrode phau ntawv arc vuam, ntxiv rau kom qhuav cov electrode thiab ntxuav qhov zawj, nws yog ib qho tsim nyog yuav tau pib los ntawm cov txheej txheem ntsuas los xyuas kom meej qhov ruaj khov ntawm kev hloov pauv ntawm arc dripping.
3. Xaiv lub vuam fais fab mov kom ruaj khov arc
Vim tias J507 electrode npog muaj cov ionization muaj peev xwm fluoride, ua rau cov roj arc tsis ruaj khov, yog li nws yuav tsum xaiv qhov tsim nyog vuam fais fab. DC vuam fais fab mov peb feem ntau siv yog 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 cov yam ntxwv tsis zoo, tab sis vim tias lub tshuab hluav taws xob DC arc vuam yog los ntawm kev xaiv tus commutator ncej kom ua tiav lub hom phiaj ntawm kev kho, yog li nws cov zis tam sim no waveform yog ib qho kev viav vias tsis tu ncua, uas yog khi rau qhov ntsuas tam sim no. qib macro, thiab cov zis tam sim no yog qhov hloov pauv me me ntawm qib micro, tshwj xeeb tshaj yog nyob rau hauv kev hloov pauv uas ua rau muaj kev nce hauv lub viav vias amplitude. Rau silicon rectifier DC vuam tshuab yog lim los ntawm silicon Cheebtsam tom qab rectification, txawm hais tias cov zis tam sim no muaj peaks thiab troughs, tab sis nyob rau hauv tag nrho yog du, los yog nyob rau hauv ib tug txheej txheem yog ib tug heev npaum li cas ntawm viav vias, nws muaj peev xwm txiav txim siab mus tas li. 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 qhov porosity ntawm silicon rectifier vuam tshuab yog qis dua li ntawm DC arc vuam tshuab. Tom qab soj ntsuam cov txiaj ntsig kev xeem, nws tau txiav txim siab tias tam sim no vuam fais fab mov ntawm silicon ib leeg vuam tshuab yuav tsum raug xaiv thaum J507 electrode siv rau vuam, uas tuaj yeem ua kom ruaj khov ntawm arc thiab zam qhov tshwm sim ntawm qhov tsis xws luag.
4. Xaiv qhov tsim nyog vuam tam sim no
Vim yog siv J507 electrode welding, ntxiv rau cov txheej txheem, cov electrode kuj muaj ntau cov ntsiab lus alloying hauv cov tub ntxhais vuam 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 loj tam sim no, lub pas dej daws teeb meem ua tob dua, cov tshuaj tiv thaiv metallurgical yog khaus, thiab cov ntsiab lus alloying raug hlawv tiag. Vim tias qhov tam sim no loj dhau lawm, qhov kev tiv thaiv tshav kub ntawm cov tub ntxhais vuam tau pom tseeb, thiab cov electrode yog xim liab, uas ua rau ntxov ntxov decomposition ntawm cov organic teeb meem nyob rau hauv lub electrode txheej thiab tsim ntawm pores; Thiab qhov tam sim no tsawg dhau. Lub crystallization tus nqi ntawm lub pas dej molten yog ceev heev, thiab cov roj hauv lub pas dej molten tsis tuaj yeem khiav tawm sai txaus los tsim cov pores. Tsis tas li ntawd, DC thim rov qab polarity tau txais yuav, thiab qhov kub ntawm thaj tsam cathode yog qis. Txawm hais tias hydrogen atoms tsim nyob rau hauv cov tshuaj tiv thaiv hnyav yog yaj nyob rau hauv lub pas dej ua ke, lawv tsis tuaj yeem hloov tau sai los ntawm cov ntsiab lus alloying. Txawm hais tias cov hydrogen sai sai tawm sab nraum lub vuam, thiab lub pas dej ua kua dej txias sai sai tom qab overheating, cov seem hydrogen molecules solidify nyob rau hauv cov kua pas dej ua ke weld, tsim porosity defects. Yog li ntawd, nws yog ib qho tsim nyog yuav tau xav txog qhov tsim nyog vuam tam sim no. Cov txheej txheem tam sim no ntawm qis hydrogen electrode feem ntau yog kwv yees li 10 ~ 20% me dua li cov kua qaub electrode ntawm tib qhov tshwj xeeb. Nyob rau hauv kev xyaum ntau lawm, qhov tsawg hydrogen hom electrode yuav siv tau raws li cov ntaub ntawv tam sim no los ntawm multiplying lub square ntawm txoj kab uas hla ntawm lub electrode los ntawm kaum. Piv txwv li, txoj kab uas hla ntawm 3.2mm electrode tuaj yeem teem rau 90 ~ 100A, thiab txoj kab uas hla ntawm 4.0mm electrode tuaj yeem teem rau 160 ~ 170A raws li kev siv tam sim no, thiab kev sim siv los ua lub hauv paus rau kev xaiv cov txheej txheem tsis. Qhov no tuaj yeem txo qhov kub hnyiab ntawm cov ntsiab lus alloying thiab tsis txhob muaj qhov porosity.
5. Tsim nyog arc pib thiab retraction
J507 vuam cov pob qij txha muaj feem ntau ntawm porosity tshaj lwm qhov chaw, vim hais tias qhov sib koom tes yuav tsum tau txias me ntsis tshaj lwm qhov chaw thaum vuam. Vim tias qhov hloov pauv ntawm cov electrode tshiab tau ua rau lub sijhawm ntawm cov cua sov dissipation ntawm qhov qub arc rov qab, kuj tseem tuaj yeem muaj qhov corrosion hauv zos thaum kawg ntawm cov electrode tshiab, uas ua rau cov porosity ntom ntawm qhov sib koom ua ke. Txhawm rau daws qhov tshwm sim qhov tsis xws luag, ntxiv rau kev txhim kho qhov tsim nyog arc oob khab phaj thaum pib ntawm kev ua haujlwm, qhov kawg ntawm txhua lub tshuab hluav taws xob tshiab yog maj mam muab so rau ntawm arc oob khab phaj thaum pib ntawm lub arc nyob rau hauv nruab nrab ntawm kev sib koom tes. Txhawm rau tshem tawm xeb los ntawm qhov kawg. Nyob rau hauv nruab nrab ntawm kev sib koom tes, nws yog ib qho tsim nyog yuav tsum tau siv txoj kev ua ntej arc, uas yog, tom qab lub arc yog stabilized ntawm 10 ~ 20mm ua ntej weld, ces rub rov qab mus rau qhov sib koom arc retract, thiaj li ua kom sov hauv zos. thawj arc thim rov qab, thiab tom qab ntawd txo qis arc tom qab tsim cov pas dej ua kua, me ntsis nce thiab nqis 1-2 zaug, uas yog, ib txwm sawb vuam. Lub arc yuav tsum tau khaws cia kom luv li sai tau los tiv thaiv lub pas dej ua ke los ntawm kev sau lub qhov arc, thiab lub qhov arc yuav tsum tau ntim nrog cov ntsiab lus arc lossis viav vias rov qab 2-3 zaug kom tshem tawm cov porosity ntawm arc retract.
6. luv arc ua haujlwm ncaj kab
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 daws teeb meem, kom lub pas dej daws teeb meem hauv lub xeev kub kub npau npau tsis cuam tshuam los ntawm huab cua sab nraud thiab tsim cov porosity. Txawm li cas los xij, dab tsi lub xeev qhov luv luv arc yuav tsum tau khaws cia rau hauv, peb ntseeg tias nws yuav tsum sib txawv raws li qhov sib txawv ntawm cov electrode. Feem ntau qhov luv luv arc txhais tau hais tias qhov ntev arc yog tswj los ntawm 2/3 ntawm txoj kab uas hla ntawm electrode. Vim tias qhov kev ncua deb me me, tsis tsuas yog lub pas dej daws teeb meem tsis tuaj yeem pom meej, nws tsis yooj yim rau kev khiav lag luam, thiab nws yuav ua rau luv luv thiab tawg arc. Siab dhau lossis qis dhau tsis tuaj yeem ua tiav lub hom phiaj ntawm kev tiv thaiv lub pas dej. Thaum thauj tus pas nrig, nws yog qhov tsim nyog los siv txoj kab ncaj nraim, thiab ntau dhau ntawm lub viav vias reciprocating yuav ua rau muaj kev tiv thaiv tsis zoo ntawm lub pas dej ua ke. Rau cov tuab loj (hais txog ntau dua lossis sib npaug li 16 hli) tuaj yeem siv los qhib U-shaped lossis ob chav U-puab zawj los daws, hauv qhov npog vuam kuj tseem tuaj yeem ua tau ntau qhov kev siv vuam kom txo tau lub viav vias amplitude. Cov txheej txheem saum toj no yog siv rau hauv cov khoom siv vuam, uas tsis tsuas yog ua kom cov khoom siv sab hauv zoo tab sis kuj yog qhov zoo thiab zoo nkauj vuam dhau.
Hauv kev ua haujlwm ntawm J507 electrode welding, ntxiv rau cov txheej txheem saum toj no ntsuas los tiv thaiv qhov porosity, qee qhov kev cai ntawm cov txheej txheem kev kho mob tsis tuaj yeem tsis quav ntsej. Piv txwv li: ziab ntawm vuam pas nrig kom tshem tawm cov roj noo noo, kev txiav txim siab thiab kho qhov zawj, txoj haujlwm hauv av kom zoo los tiv thaiv arc bias tshwm sim los ntawm huab cua qhov thiab lwm yam. Tsuas yog ua ke nrog cov yam ntxwv ntawm cov khoom los ntawm cov txheej txheem ntsuas los tswj, yuav tsum muaj peev xwm txo qis thiab tsis txhob muaj qhov tsis zoo porosity.
