High carbon steel yog hais txog carbon steel nrog w (C) siab tshaj 0.6%. Nws muaj lub siab xav ua kom tawv dua li nruab nrab carbon steel thiab tsim cov pa roj carbon martensite siab, uas yog rhiab heev rau kev tsim cov kab mob khaub thuas. Nyob rau tib lub sijhawm, cov qauv martensite tsim nyob rau hauv qhov chaw vuam cua sov yog qhov nyuaj thiab nkig, ua rau cov plasticity thiab toughness ntawm kev sib koom ua ke kom txo tau zoo heev. Yog li ntawd, lub weldability ntawm high-carbon steel yog heev tsis zoo, thiab tshwj xeeb vuam txheej txheem yuav tsum tau saws los xyuas kom meej cov kev ua tau zoo ntawm kev sib koom tes. . Yog li ntawd, nws yog feem ntau tsis tshua siv nyob rau hauv welded lug. Cov pa roj carbon ntau yog tsuas yog siv rau lub tshuab qhov chaw uas yuav tsum tau muaj zog hardness thiab hnav tsis kam, xws li rotating shafts, loj zog thiab couplings [1]. Yuav kom txuag tau cov hlau thiab ua kom yooj yim rau kev siv tshuab, cov tshuab no feem ntau ua ke nrog cov qauv welded. Hauv kev tsim tshuab hnyav, vuam teeb meem ntawm cov pa roj carbon steel siab kuj tau ntsib. Thaum tsim cov txheej txheem welding rau siab carbon steel weldments, ntau yam ua tau vuam tsis xws luag yuav tsum tau soj ntsuam kom meej thiab cov txheej txheem vuam yuav tsum tau ua.
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1 Weldability ntawm high carbon steel
1.1 Vuam txoj kev
Cov pa roj carbon ntau yog siv rau cov qauv uas muaj siab tawv thiab hnav tsis kam, yog li txoj kev vuam tseem ceeb yog electrode arc vuam, brazing thiab submerged arc vuam.
1.2 Cov khoom siv vuam
High carbon steel welding feem ntau tsis tas yuav muaj zog sib npaug ntawm qhov sib koom ua ke thiab lub hauv paus hlau. Thaum arc vuam, qis-hydrogen electrodes nrog muaj zog sulfur tshem tawm muaj peev xwm, tsawg diffusible hydrogen ntsiab lus nyob rau hauv cov deposited hlau, thiab zoo toughness feem ntau yog siv. Thaum lub zog ntawm cov hlau vuam thiab lub hauv paus hlau yuav tsum sib npaug, ib qho qis-hydrogen vuam pas nrig ntawm cov qib sib txuas yuav tsum raug xaiv; Thaum lub zog ntawm cov hlau vuam thiab lub hauv paus hlau tsis tas yuav tsum tau, yuav tsum tau xaiv ib qho qis-hydrogen vuam pas nrig nrog lub zog qis dua li ntawm cov hlau hauv paus. Nco ntsoov Vuam rods nrog lub zog siab dua li cov hlau tsis tuaj yeem xaiv. Yog tias lub hauv paus hlau tsis raug tso cai rau preheated thaum vuam, txhawm rau tiv thaiv cov kab mob khaub thuas hauv thaj chaw muaj kev kub ntxhov, austenitic stainless hlau electrodes tuaj yeem siv kom tau txais cov qauv austenitic nrog cov yas zoo thiab muaj zog tawg.
1.3 Bevel npaj
Txhawm rau txwv cov feem ntau ntawm cov pa roj carbon monoxide hauv cov hlau vuam, qhov sib piv ntawm fusion yuav tsum raug txo, yog li U-shaped lossis V-shaped grooves feem ntau siv thaum vuam, thiab yuav tsum tau them nyiaj rau kev tu cov zawj thiab cov roj stains, xeb, thiab lwm yam hauv 20mm ntawm ob sab ntawm qhov zawj.
1.4 Preheating
Thaum vuam nrog cov txheej txheem steel electrodes, nws yuav tsum tau preheated ua ntej vuam, thiab lub preheating kub yog tswj ntawm 250 ° C thiab 350 ° C.
1.5 Interlayer ua
Thaum vuam ntau cov khaubncaws sab nraud povtseg thiab ntau dhau, ib qho me me-inch electrode thiab qis tam sim no yog siv rau thawj zaug. Feem ntau, lub workpiece yog muab tso rau hauv ib nrab ntsug vuam los yog vuam pas nrig yog siv los ua viav vias tom qab, yog li ntawd tag nrho lub hauv paus hlau tshav kub-cuam tshuam cheeb tsam yog rhuab nyob rau hauv ib tug luv luv lub sij hawm kom tau preheating thiab kub preservation los.
1.6 Kev kho cua sov tom qab vuam
Tam sim ntawd tom qab vuam, cov khoom ua haujlwm tau muab tso rau hauv lub qhov cub cua sov thiab khaws cia ntawm 650 ° C rau kev ntxhov siab annealing [3].
2 Welding tsis xws luag ntawm high carbon steel thiab kev tiv thaiv kev ntsuas
Vim tias cov pa roj carbon monoxide siab muaj lub zog ua kom tawv, cov tawg kub thiab cov kab nrib pleb yog qhov tshwm sim thaum vuam.
2.1 Kev tiv thaiv kev tiv thaiv thermal tawg
1) Tswj cov tshuaj muaj pes tsawg leeg ntawm cov weld, nruj me ntsis tswj cov sulfur thiab phosphorus cov ntsiab lus, thiab tsim nyog nce cov ntsiab lus manganese los txhim kho cov qauv vuam thiab txo kev sib cais.
2) Tswj tus ntoo khaub lig-sectional duab ntawm lub weld thiab ua rau qhov dav-rau-qhov sib piv me ntsis loj dua kom tsis txhob muaj kev sib cais hauv qhov nruab nrab ntawm qhov vuam.
3) Rau nruj weldments, qhov tsim nyog vuam tsis, qhov tsim nyog vuam sib lawv liag thiab kev taw qhia yuav tsum tau xaiv.
4) Yog tias tsim nyog, ua kom sov ua ntej thiab ua kom txias qeeb los tiv thaiv qhov tshwm sim ntawm thermal tawg.
5) Ua kom cov alkalinity ntawm vuam pas nrig los yog flux kom txo tau cov impurity cov ntsiab lus nyob rau hauv lub vuam thiab txhim kho cov degree ntawm segregation.
2.2 Kev tiv thaiv kev tiv thaiv kab mob khaub thuas [4]
1) Preheating ua ntej welding thiab qeeb txias tom qab vuam tuaj yeem tsis tsuas yog txo qhov hardness thiab brittleness ntawm tshav kub-cuam tshuam cheeb tsam, tab sis kuj ceev lub sab nraud diffusion ntawm hydrogen nyob rau hauv lub vuam.
2) Xaiv qhov kev ntsuas vuam tsim nyog.
3) Txais kev sib dhos tsim nyog thiab vuam ua ntu zus los txo qhov kev ntxhov siab ntawm kev sib koom ua ke welded thiab txhim kho lub xeev kev ntxhov siab ntawm vuam.
4) Xaiv cov khoom siv vuam tsim nyog, ziab cov electrodes thiab flux ua ntej vuam, thiab npaj rau kev siv.
5) Ua ntej vuam, dej, xeb thiab lwm yam kab mob ntawm cov hlau yooj yim nyob ib ncig ntawm qhov zawj yuav tsum tau ua tib zoo tshem tawm kom txo tau cov ntsiab lus ntawm diffusible hydrogen hauv qhov vuam.
6) Kev kho dehydrogenation yuav tsum tau nqa tawm tam sim ua ntej vuam kom tso hydrogen kom dim ntawm qhov sib koom ua ke.
7) Kev ntxhov siab-relieving annealing kev kho mob yuav tsum tau ua tam sim ntawd tom qab vuam los txhawb lub sab nraud diffusion ntawm hydrogen nyob rau hauv lub weld.
3 Kev xaus
Vim muaj cov ntsiab lus carbon siab, siab hardenability thiab tsis zoo weldability ntawm siab carbon steel, nws yog ib qho yooj yim los tsim high carbon martensite qauv thiab welding tawg thaum lub sij hawm vuam. Yog li ntawd, thaum welding high carbon steel, cov txheej txheem vuam yuav tsum raug xaiv tsim nyog. Thiab ua raws li kev ntsuas raws sijhawm kom txo tau qhov tshwm sim ntawm vuam tawg thiab txhim kho kev ua haujlwm ntawm cov pob qij txha welded.
Post lub sij hawm: May-27-2024
