I. Yam ntxwv ntawm Tus Kheej -Shielded Flux-Cored Vuam Hlau
Xyoo 1958, Tebchaws Meskas thiab yav dhau los Soviet Union ib txhij tsim cov flux-cored vuam hlau uas tsis xav tau kev tiv thaiv roj, uas yog tam sim no tus kheej -shielded flux-cored vuam hlau. Tshaj li 50 xyoo tom ntej no, tus kheej -shielded flux-cored vuam hlau tau pom kev txhim kho tseem ceeb vim nws qhov tshwj xeeb zoo. Hauv Tebchaws Meskas, tus kheej -shielded flux-cored vuam hlau tso nyiaj rau 30% ntawm tag nrho cov flux-cored vuam hlau ua lag luam.
Tam sim no, tus kheej -shielded flux- cored vuam hlau yog dav siv nyob rau hauv pipeline tsim, marine engineering, sab nraum zoov loj steel qauv tsim, siab- nce steel qauv vaj tse, nto cladding, thiab lwm yam.
Self-shielded flux-cored vuam hlau tiv thaiv cov molten droplets thiab weld pas dej ua ke los ntawm cov pa roj thiab slag tsim los ntawm cov slag-forming agent thiab gas-forming agent nyob rau hauv lub flux core nyob rau hauv lub kub kub ntawm hluav taws xob arc. Tus kheej-shielded flux-cored hlau arc vuam muaj qhov zoo hauv qab no:
1. Tsis tas yuav tsum muaj cov khoom siv tiv thaiv sab nraud; lub vuam torch muaj cov qauv yooj yim, yog lub teeb yuag, thiab yooj yim rau kev khiav lag luam.
2. Zoo heev cua thiab porosity kuj. Thaum lub sij hawm vuam, vuam hlau nws tus kheej tsim ib qho chaw tiv thaiv los ntawm metallurgical cov tshuaj tiv thaiv, tso cai rau welding nyob rau hauv cov cua mus rau theem 4. Tsuav qhov cua ceev tsis tshaj 8 m / s, tsis muaj kev tiv thaiv kev tiv thaiv yog tsim nyog, ua tshwj xeeb tshaj yog haum rau kev ua hauj lwm teb.
3. Kev nkag siab arc siab, nrog lub dav hlau -zoo li kev hloov pauv ntawm cov kwj deg molten thiab me me spatter.
4. Txhua yam zoo heev - txoj hauj lwm ntsug welding kev ua tau zoo thiab kev ua haujlwm zoo.
5. Kev tshem tawm slag zoo.
6. Cov hlau tso tawm tuaj yeem ua tiav qhov siab qis- qhov kub thiab txias txawm tias nyob rau hauv ntau yam hnyav xws li qhov kub thiab txias thiab cua txias.
II. Yuav tsum muaj rau Kev Siv Tus Kheej -Shielded Flux-Cored Hlau
1. vuam fais fab mov
Siv cov khoom siv hluav taws xob DC tshwj xeeb thiab inverter fais fab mov.
2. Siv DC zoo polarity (DC-): Txuas lub workpiece mus rau qhov zoo davhlau ya nyob twg ntawm lub hwj chim mov thiab lub welding teeb rau qhov tsis zoo davhlau ya nyob twg.
Rov qab polarity kev twb kev txuas yooj yim ua rau ntau tshaj spatter, ntiav nkag, thiab vuam tsis ua hauj lwm.
3. Thaum welding downwards, lub vuam hlau lub kaum sab xis feem ntau yuav tsum tau khaws cia ntawm 80℃-90℃kom tsis txhob molten slag thiab hlau poob thaum nyob ze rau ntawm txoj hauj lwm ntsug, uas tuaj yeem cuam tshuam qhov kev vam meej ntawm vuam kev ua haujlwm thiab yooj yim ua rau tsis xws luag xws li slag inclusions thiab porosity.
4. Qhov ntev ntawm tus kheej -shielded flux-cored vuam hlau feem ntau yuav tsum tau tswj ntawm 6-10 npaug ntawm txoj kab uas hla. Ntev ntev ntev yuav ua rau cov hlau yaj sai heev, txo lub zog arc.
5. Qhov saum npoo yuav tsum tau welded yuav tsum zoo ib yam thiab du, tsis muaj xeb, slag, roj, thiab lwm yam teeb meem uas cuam tshuam rau weld zoo.
6. Lub vuam av xaim yuav tsum nyob ze li sai tau rau qhov chaw vuam, thiab nws cov conductivity yuav tsum tau lees paub tias yog qhov zoo (xyuas rau oxidation ntawm cov hlau hauv av, kev sib txuas ruaj ntseg, thiab tsis muaj xeb ntawm qhov chaw sib cuag ntawm cov hlau hauv av thiab lub hauv paus hlau). Tsis zoo conductivity yuav ua rau arc instability.
7. Qhov zoo ntawm vuam parameter hloov ncaj qha cuam tshuam rau vuam zoo.
Tsis txaus tam sim no tuaj yeem yooj yim ua rau kev nkag mus tsis tiav thiab slag suav nrog.
Tsis txaus tam sim no tuaj yeem ua rau kub hnyiab tau yooj yim- los ntawm, nce spatter, thiab, thaum lub sij hawm welding downward, ua rau molten slag thiab hlau ntws mus downwards, ua welding tsis yooj yim sua thiab ua rau muaj feem ntawm porosity.
Tsis txaus voltage tuaj yeem yooj yim ua rau qhov tsis ruaj tsis khov, tsis ua haujlwm qhib cov xaim hluav taws xob thiab cov pas dej molten, thiab cov slag suav nrog.
Tsis txaus voltage tuaj yeem yooj yim ua rau lub arc nyob deb dhau ntawm lub pas dej molten, tso cai rau huab cua nkag mus thiab ua rau cov porosity.
