Electrode txheej yog hais txog cov txheej txheej uas siv rau ntawm qhov chaw ntawm lub vuam core.
Cov txheej yog decomposed thiab melted nyob rau hauv cov txheej txheem vuam los ua cov pa roj thiab slag, uas ua lub luag haujlwm hauv kev tiv thaiv txhua yam, kev kho metallurgical, thiab txhim kho cov txheej txheem kev ua haujlwm.
Cov txheej txheem muaj xws li: minerals (xws li marble, fluorspar, thiab lwm yam), ferroalloys thiab hlau hmoov (xws li ferromanganese, ferro-titanium, thiab lwm yam), organic tshuaj (xws li ntoo hmoov, hmoov txhuv nplej siab, thiab lwm yam), Cov khoom siv tshuaj (xws li titanium Dawb hmoov, iav dej, thiab lwm yam).
Electrode txheej yog qhov tseem ceeb hauv kev txiav txim siab qhov zoo ntawm cov vuam, thiab nws muaj cov teebmeem hauv qab no hauv cov txheej txheem vuam.
Txhim kho qhov stability ntawm arc combustion.Lub uncoated electrode tsis yooj yim rau ignite lub arc. Txawm hais tias nws yog ignited, nws tsis tuaj yeem hlawv ruaj khov.
Cov txheej txheej electrode feem ntau muaj cov tshuaj uas tsis tshua muaj ionization muaj peev xwm xws li potassium, sodium, calcium, thiab lwm yam, uas tuaj yeem txhim kho qhov ruaj khov ntawm arc thiab xyuas kom cov txheej txheem vuam txuas ntxiv.
Tiv thaiv lub pas dej ua ke.Thaum lub sij hawm vuam txheej txheem, oxygen, nitrogen thiab dej vapor nyob rau hauv cov huab cua nkag mus rau hauv lub weld seam, uas yuav muaj kev cuam tshuam tsis zoo rau lub weld seam. Tsis tsuas yog tsim ntawm pores, tab sis kuj txo cov neeg kho tshuab zog ntawm weld, thiab txawm ua rau tawg. Tom qab cov txheej electrode melted, ib tug loj npaum li cas ntawm cov roj yog generated npog lub arc thiab molten pas dej ua ke, uas yuav txo tau cov kev sib tshuam ntawm cov hlau molten thiab huab cua. Thaum cov weld txias, cov txheej txheej melted tsim ib txheej ntawm slag, uas npog qhov chaw ntawm lub vuam, tiv thaiv cov hlau vuam thiab txias nws maj mam, txo qhov muaj peev xwm ntawm porosity.
Xyuas kom meej tias cov weld yog deoxidized thiab desulfurized thiab phosphorus impurities.Txawm hais tias kev tiv thaiv yog nqa tawm thaum lub sij hawm vuam, nws tseem yog ib qho tseem ceeb uas cov pa me me yuav nkag mus rau hauv lub pas dej molten kom oxidize cov hlau thiab hlau, hlawv cov hlau alloy, thiab txo qhov zoo ntawm cov vuam. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau ntxiv cov tshuaj txo qis (xws li manganese, silicon, titanium, aluminium, thiab lwm yam) rau cov txheej txheem electrode kom txo cov oxides uas tau nkag mus rau hauv lub pas dej molten.
Ntxiv alloying ntsiab rau lub vuam.Vim muaj qhov kub thiab txias ntawm cov arc, cov alloying ntsiab ntawm cov hlau weld yuav evaporated thiab burnt, uas yuav txo tau cov mechanical zog ntawm weld. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau ntxiv cov ntsiab lus alloying tsim nyog rau lub vuam los ntawm cov txheej txheem kom them nyiaj rau qhov kub hnyiab ntawm cov ntsiab lus alloy thiab kom ntseeg tau lossis txhim kho cov khoom siv ntawm cov khoom siv vuam. Rau kev vuam ntawm qee cov hlau alloy, nws tseem yuav tsum tau nkag mus rau hauv cov hlau rau hauv cov vuam los ntawm txheej, kom cov hlau vuam tuaj yeem nyob ze rau cov hlau muaj pes tsawg leeg ntawm cov hlau hauv paus, thiab cov khoom siv kho tshuab tuaj yeem ntes los yog ntau tshaj. lub hauv paus hlau.
Txhim kho vuam tsim tau. Cov txheej txheej electrode muaj cov nyhuv ntawm kev ua kom cov tee dej thiab txo cov spatter. Lub melting point ntawm lub electrode txheej yog me ntsis qis dua qhov vuam taw tes ntawm cov tub ntxhais, tab sis vim hais tias cov tub ntxhais yog nyob rau hauv nruab nrab ntawm lub arc thiab qhov kub thiab txias yog siab dua, cov tub ntxhais melts ua ntej, thiab lub txheej melts me ntsis tom qab. Nyob rau hauv txoj kev no, ib qho luv luv ntawm lub tes tsho sheathed yog tsim nyob rau hauv qhov kawg ntawm lub electrode, thiab cov nyhuv ntawm lub arc tshuab quab yuam ua rau cov tee droplet ncaj qha mus rau lub molten pas dej ua ke, ua rau nws muaj txiaj ntsig zoo rau cov nyiaj siv ua haujlwm vuam thiab ntsug vuam. Tsis tas li ntawd, tom qab vuam core yog coated, lub arc tshav kub yog ntau concentrated. Nyob rau tib lub sijhawm, txij li cov hlau tsis tau tshwm sim los ntawm kev sib tsoo yog txo, qhov kev tso nyiaj coefficient nce ntxiv, thiab cov khoom siv vuam kuj tseem txhim kho. Tsis tas li ntawd, tus nqi ntawm cov plua plav tsim thaum lub sij hawm vuam yuav raug txo.
