Lub tswv yim thiab kev faib tawm ntawm cov roj hlau arc vuam
Arc vuam txoj kev uas siv ib tug melting electrode, ib tug sab nraud roj raws li lub arc nruab nrab, thiab tiv thaiv cov hlau tee, welding lub molten pas dej ua ke thiab high-temperature hlau nyob rau hauv lub vuam cheeb tsam, hu ua gas-shielded arc vuam. Nyob ntawm cov khoom siv hlau thiab thaiv cov roj, nws tuaj yeem muab faib ua cov hauv qab no, raws li qhia hauv daim duab.
Raws li kev faib tawm ntawm vuam hlau, nws tuaj yeem muab faib ua cov khoom siv hlau vuam thiab flux cored vuam. Cov roj inert (Ar lossis Nws) shielded arc vuam txoj kev nrog cov khoom tseem ceeb hlau yog hu ua molten electrode inert gas shielded welding, hu ua MIG welding (Metal Inert Gas Arc Vuam); cov argon-nplua nuj sib xyaw roj shielded arc vuam nrog cov khoom tseem ceeb hlau, hu ua MAG vuam (Hlau Active Gas Arc Vuam). CO2 roj shielded vuam nrog cov tub ntxhais hlau, hu ua CO2 vuam. Thaum siv cov xaim flux-cored, arc vuam uas tuaj yeem siv CO2 lossis CO2+Cov roj sib xyaw ua cov roj tiv thaiv hu ua flux-cored wire gas shielded welding. Nws kuj tseem tuaj yeem ntxiv tsis muaj shielding roj, txoj kev no hu ua self-shielded arc vuam.
Qhov sib txawv ntawm qhov sib txawv ntawm MIG / MAG vuam thiab CO2 vuam
Cov yam ntxwv ntawm CO2 vuam yog: tus nqi qis thiab kev ua haujlwm siab. Txawm li cas los xij, muaj qhov tsis zoo ntawm qhov loj ntawm spatter thiab ua tsis zoo, yog li qee qhov txheej txheem vuam siv MIG / MAG vuam zoo tib yam. Ordinary MIG/MAG welding yog ib txoj kev vuam arc tiv thaiv los ntawm cov roj inert lossis argon-nplua nuj roj, thaum CO2 vuam muaj zog oxidizing zog, uas txiav txim siab qhov sib txawv thiab cov yam ntxwv ntawm ob. Lub ntsiab zoo ntawm MIG / MAG vuam piv nrog CO2 vuam yog raws li nram no:
1) Tus nqi ntawm spatter yog txo los ntawm ntau tshaj 50%. Lub vuam arc yog ruaj khov nyob rau hauv kev tiv thaiv ntawm argon los yog argon-nplua nuj roj, tsis tsuas yog lub arc yog ruaj khov thaum lub sij hawm poob thiab dav hlau hloov mus, tab sis kuj nyob rau hauv cov ntaub ntawv ntawm luv luv-circuit hloov ntawm low-tam sim no MAG welding, cov nyhuv repulsion. lub arc ntawm lub tee dej yog me me, yog li ua kom ntseeg tau tias MIG / Tus nqi ntawm spatter nyob rau hauv luv luv-circuit hloov ntawm MAG vuam yog txo los ntawm ntau tshaj 50%.
2) Lub vuam seam yog sib xws thiab zoo nkauj. Vim tias qhov sib xws, zoo thiab ruaj khov hloov pauv hauv MIG / MAG vuam, vuam seam yog zoo ib yam thiab zoo nkauj.
3) Ntau cov hlau ua haujlwm thiab lawv cov alloys tuaj yeem welded. Cov cuab yeej oxidizing ntawm arc cua yog qhov tsis muaj zog lossis txawm tias tsis muaj oxidizing. MIG / MAG vuam tsis tuaj yeem tsuas yog vuam cov hlau thiab cov hlau alloy siab, tab sis kuj tseem txuas ntau cov hlau nquag thiab lawv cov alloys, xws li: txhuas thiab txhuas alloys, stainless hlau thiab nws cov alloys, Magnesium thiab magnesium alloys, thiab lwm yam.
4) Zoo heev txhim kho vuam manufacturability, vuam zoo thiab ntau lawm efficiency.
Qhov txawv ntawm pulsed MIG / MAG vuam thiab zoo tib yam MIG / MAG vuam
Daim ntawv tseem ceeb ntawm kev hloov pauv hauv cov MIG / MAG welding zoo tib yam yog dav hlau hloov mus rau qhov siab tam sim no thiab luv luv-circuit hloov ntawm qhov tam sim no. Yog li ntawd, me me tam sim no tseem muaj qhov tsis zoo ntawm qhov loj ntawm spatter thiab kev ua tsis zoo, tshwj xeeb tshaj yog qee cov hlau tsis tuaj yeem siv rau hauv qis tam sim no. Vuam xws li txhuas thiab alloys, stainless hlau, thiab lwm yam. Yog li ntawd, pulsed MIG / MAG vuam tau tshwm sim. Cov yam ntxwv ntawm kev hloov pauv hloov pauv yog tias txhua tus mem tes tam sim no hloov cov tee dej, uas yog nyob rau hauv cov dej hloov pauv hauv cov ntsiab lus. Piv nrog rau qhov zoo tib yam MIG / MAG vuam, nws cov yam ntxwv tseem ceeb yog raws li nram no:
1) Qhov zoo tshaj plaws droplet hloov daim ntawv rau mem tes MIG / MAG vuam yog ib tug droplet nrog ib tug mem tes. Nyob rau hauv txoj kev no, los ntawm kev kho cov mem tes zaus, tus naj npawb ntawm cov tee hloov mus rau ib lub sij hawm yuav raug hloov, uas yog, melting ceev ntawm vuam hlau.
2) Vim tias lub xaim xaim ntawm ib lub mem tes thiab ib lub tee dej, txoj kab uas hla ntawm cov tee dej yog kwv yees sib npaug ntawm txoj kab uas hla ntawm lub vuam hlau, thiab lub arc cua sov ntawm cov tee dej yog qis dua, uas yog, cov tee dej kub tsawg (piv. nrog rau lub dav hlau hloov mus thiab qhov loj droplet hloov). Yog li ntawd, lub melting coefficient ntawm vuam hlau yog zoo dua, uas yog, lub melting efficiency ntawm vuam hlau yog zoo dua.
3) Vim tias qhov qis qis qis, muaj cov pa taws tsawg dua. Nyob rau hauv txoj kev no, qhov hluav taws kub poob ntawm alloying ntsiab yog txo ntawm ib sab, thiab kev tsim kho ib puag ncig zoo dua ntawm qhov tod tes.
Piv nrog rau qhov zoo tib yam MIG / MAG vuam, nws lub ntsiab zoo yog raws li nram no:
1) Lub vuam spatter me me, lossis txawm tias tsis muaj spatter.
2) Zoo arc ncaj qha, haum rau txhua txoj haujlwm vuam.
3) Weld seam yog tsim tau zoo, fusion dav yog loj, tus ntiv tes-zoo li tus cwj pwm nkag mus rau qhov tsis muaj zog, thiab qhov seem qhov siab me me.
4) Me me tam sim no zoo kawg nkaus welds nquag hlau (xws li txhuas thiab nws cov alloys, thiab lwm yam).
Kev nthuav dav tam sim no ntawm MIG / MAG vuam dav hlau hloov mus. Thaum lub sij hawm pulse welding, cov vuam tam sim no tuaj yeem ua tiav cov xaim xaim xaim ruaj khov los ntawm ze rau qhov tseem ceeb ntawm lub dav hlau hloov mus rau qhov tam sim no ntau ntawm kaum tawm amperes.
Cov yam ntxwv thiab qhov zoo ntawm pulsed MIG / MAG tuaj yeem pom los ntawm saum toj no, tab sis tsis muaj dab tsi tuaj yeem ua tau zoo. Piv nrog rau MIG / MAG zoo tib yam, nws qhov tsis txaus yog raws li hauv qab no:
1) Cov kev xav zoo li qub ntawm vuam kev ua haujlwm tau qis dua me ntsis.
2) Cov kev xav tau zoo dua rau cov welders.
3) Tam sim no, tus nqi ntawm cov khoom siv vuam yog qhov siab.
Txoj kev txiav txim siab tseem ceeb rau kev xaiv cov mem tes MIG / MAG vuam
Raws li cov txiaj ntsig ntawm kev sib piv saum toj no, txawm hais tias mem tes MIG / MAG vuam muaj ntau qhov zoo uas lwm cov vuam tsis tuaj yeem ua tiav thiab sib piv, nws kuj muaj cov teeb meem ntawm cov khoom siv siab, me ntsis kev ua haujlwm qis, thiab nyuaj rau cov welding tswv. Yog li, kev xaiv cov mem tes MIG / MAG vuam yog txiav txim siab los ntawm cov txheej txheem vuam uas yuav tsum tau ua. Raws li qhov tam sim no cov txheej txheem vuam txheej txheem hauv tsev muaj kev txhawj xeeb, cov vuam hauv qab no yuav tsum pib siv lub tshuab nqus MIG / MAG vuam.
1) carbon hlau. Cov sijhawm uas yuav tsum tau muaj siab ntawm cov khoom siv vuam zoo thiab cov tsos yog feem ntau nyob rau hauv lub siab lub nkoj kev lag luam, xws li boilers, tshuaj kub exchangers, central cua txias cua sov exchangers, thiab volutes rau turbines nyob rau hauv lub hydropower kev lag luam.
2) Stainless hlau. Siv cov tam sim no me me (qis dua 200A yog hu ua me me tam sim no, tib yam hauv qab no) thiab lub sijhawm muaj kev xav tau siab ntawm cov khoom siv vuam zoo thiab cov tsos, xws li locomotives, siab hlab ntsha hauv kev lag luam tshuaj, thiab lwm yam.
3) Aluminium thiab nws cov alloys. Siv cov tam sim no me me (qis dua 200A yog hu ua me me tam sim no, tib yam hauv qab no) thiab lub sijhawm muaj kev xav tau ntawm cov khoom siv vuam zoo thiab cov tsos, xws li cov tsheb ciav hlau, cov hluav taws xob hluav taws xob, kev sib cais huab cua thiab lwm yam lag luam. Tshwj xeeb tshaj yog lub tsheb lub cev muaj zog, suav nrog CSR Pawg Sifang Tsheb, Tangshan Tsheb Hoobkas thiab Changke, thiab lwm cov tuam txhab me me uas ua haujlwm tawm rau lawv. Raws li kev lag luam xov xwm, los ntawm 2015, tag nrho cov nroog cov nroog thiab cov nroog uas muaj cov pej xeem ntau dua 500, 000 yuav siv tau cov tsheb fais fab, uas qhia tau hais tias qhov kev thov rau tsheb fais fab yog loj, thiab qhov kev thov rau vuam workload thiab vuam khoom yog loj heev.
4) tooj liab thiab nws cov alloys. Raws li kev nkag siab tam sim no, tooj liab thiab nws cov alloys yog siv cov mem tes MIG / MAG vuam (nyob rau hauv lub Scope ntawm MIG vuam).
