Electrode Hom E7018
Vuam pas nrig hom: Tsawg hydrogen carbon steel vuam pas nrig (hlau hmoov tsis tshua muaj hydrogen hom)
Standards: AWS A5.1
Khoom Description
Lub E7018 electrode yog ntau yam thiab txhim khu kev qha hlau- hmoov, qis- hydrogen electrode nrog ib qho yooj yim, qis- hydrogen txheej (qee cov qauv suav nrog hlau hmoov rau kev txhim kho kev tso nyiaj). Nws feem ntau yog siv rau vuam carbon steel, qis- alloy steel (xws li 16Mn thiab Q345), shipbuilding steel, thiab cov hlab ntsha siab, ntawm lwm cov qauv tseem ceeb uas yuav tsum tau muaj zog thiab tawg tsis kam. Raws li cov khoom siv tseem ceeb rau cov qauv vuam, nws qhov kev ua tau zoo tau raug tshawb xyuas nruj los ntawm kev sim: ua tau raws li AWS A5.1 cov qauv, cov hlau tso tawm ua tiav lub zog tensile ntawm 70,000 psi (kwv yees li 482.6 MPa), thiab vuam tawg ntawm tag nrho cov welds hauv lub hauv paus hlau thaum lub sij hawm ntsuas tensile 7%, nrog kev nyab xeeb ntawm kev siv tshuab. kev ncaj ncees ntawm welded qauv.
Lus Cim:
E7018 electrode txheej yog hygroscopic heev thiab yuav tsum tau ziab ntawm 350-400℃rau ib teev ua ntej siv teb. Vuam nrog undried electrodes nyob rau hauv ib puag ncig nrog cov av noo ntau dua 60% tuaj yeem yooj yim ua rau tsim cov pores vim yog cov tshuaj tiv thaiv hydrogen. Yog li ntawd, tshwj xeeb yuav tsum tau them nyiaj rau cov txheej txheem khaws cia thiab pretreatment.
Cov electrode no tsim nyog rau tag nrho - txoj hauj lwm vuam (kab rov tav, kab rov tav, ntsug, thiab nyiaj siv ua haujlwm vuam), yog sib xws nrog AC thiab DC fais fab mov, thiab siv qis - hydrogen txheej tsim los txo cov hydrogen diffusion thiab txo qhov kev pheej hmoo ntawm hydrogen - ua rau tawg. Nws yog dav siv nyob rau hauv vuam kev khiav hauj lwm ntawm hnyav-load lug xws li engineering machinery, txuas hniav, thiab siab hlab ntsha.
Core nta thiab qhov zoo
Raws li tus neeg sawv cev ntawm qis-hydrogen hlau hmoov vuam pas nrig, E7018 vuam pas nrig qhov zoo ntawm qhov tseem ceeb tau tshwm sim hauv peb qhov loj: qis-hydrogen tawg tsis kam, cov khoom siv zoo heev, thiab cov txheej txheem vuam zoo. Los ntawm hauv - kev sib xyaw tob ntawm cov ntaub ntawv ntsuas thiab engineering scenarios, nws tau dhau los ua cov khoom siv rau vuam cov qauv tseem ceeb xws li txuas hniav, cov hlab ntsha siab, thiab cov tshuab hnyav.
Vuam tswv yim:
Thaum vuam vertically, txo qhov tam sim no los ntawm 10%: qhov pom zoo tam sim no rau 3.2 hli electrodes yog 90-110 A, thiab rau 4.0 hli electrodes, 140-160 A. Qhov no yog kom tsis txhob hlawv-dhau los yog undercutting ntawm nyias daim hlau vim yog dhau tam sim no.
Tsawg- cov txheej hydrogen yuav tsum tau ziab kom nruj: qhuav ntawm 350-400℃rau 1-2 teev ua ntej siv, tom qab ntawd muab tso rau hauv lub thawv insulated ntawm 80-100℃. Rov ziab yog tias raug huab cua ntau tshaj 4 teev, vim qhov no tuaj yeem ua rau muaj qhov tsis xws luag.
Technical Parameters
| yam khoom | Cov ntsiab lus tshwj xeeb | Hauv -cov lus qhia txog kev xa mus rau qhov chaw |
|---|---|---|
| Yam khoom qauv | E7018 | - |
| Vuam pas nrig hom | Tsawg hydrogen carbon steel vuam pas nrig (hlau hmoov tsis tshua muaj hydrogen hom) | - |
| Cov qauv kev coj ua | AWS A5.1 | - |
| Txoj kab uas hla specifications | 3/32 nti (2.4 hli), 1/8 nti (3.2 hli), 4.0 hli | Rau nyias phaj vuam (tsawg dua los yog sib npaug li 6 hli), 3.2 hli txoj kab uas hla yog nyiam los txo qhov kev pheej hmoo ntawm kev kub hnyiab- los ntawm. |
| Siv tau hom tam sim no | AC, PEB | Nws raug nquahu kom siv DC thim rov qab polarity, arc stability zoo dua AC hom |
| Pom zoo cov khoom siv vuam | Cov pa roj carbon nruab nrab, cov hlau tsis tshua muaj hlau, txias dov hlau | Ua ntej vuam, qhov saum npoo ntawm cov khoom siv hauv paus yuav tsum tau ntxuav cov roj thiab xeb kom tsis txhob tsim cov pores. |
| Vuam txoj hauj lwm | Txhua txoj haujlwm (pas & kab rov tav, ntsug-nce, nyiaj siv ua haujlwm; ntsug-tsis pom zoo) | Thaum welding nyob rau hauv ntsug- nce txoj hauj lwm, nws raug nquahu kom txo qhov tam sim no los ntawm 5% -10% los tswj lub fluidity ntawm lub pas dej molten. |
| Chemical muaj pes tsawg leeg (deposited hlau) | C Tsawg dua lossis sib npaug 0.12%, Mn Tsawg dua lossis sib npaug 0.9%, Si Less dua lossis sib npaug 0.6%, Mo 0.4-0.65%, S Tsawg dua lossis sib npaug 0.035%, P Tsawg dua lossis sib npaug 0.035% | - |
| Mechanical zog | Tensile zog: Ntau dua lossis sib npaug ntawm 485 MPa (70,000 psi, ntsuas 510 MPa); Yield zog: Ntau dua lossis sib npaug ntawm 400 MPa ( ntsuas 450 MPa); Elongation Ntau dua lossis sib npaug li 30%; Lub zog cuam tshuam: Ntau dua lossis sib npaug rau 34 J (-20 degree, ntsuas 42 J) | Welded pob qij txha yuav tsum tau mus rau ib tug -20℃Charpy V-notch impact test kom ntseeg tau tias kub-tawv toughness raws li cov qauv. |
| Vuam tam sim no ntau yam | 3.2 hli: 120-150 A; 4.0 hli: 160-200 A | Thaum vuam daim hlau qis dua 6 hli, txo qhov tam sim no los ntawm 10% thiab tswj qhov kub nruab nrab ntawm 250℃thaum lub sij hawm ntau- txheej vuam. |
| Txheej noo noo cov ntsiab lus | Tsawg dua lossis sib npaug li 0.6% (AWS A5.1 standard) | Ua ntej siv, qhuav ntawm 300-350℃rau 1-2 teev, khaws cia rau hauv lub tshav kub preservation tube ntawm 80-120 degree, thiab tsis txhob tso cua rau ntau tshaj 4 teev. |
| Diffusible hydrogen cov ntsiab lus | Raws li tus qauv suffix (xws li E7018H4 tsawg dua lossis sib npaug li 4 ml / 100g vuam hlau) | Hauv qhov chaw ntub dej, nws raug nquahu kom siv cov hom hydrogen tsawg (H4 / H8) cov qauv ua ntej kom txo tau qhov kev pheej hmoo ntawm kev tawg. |
Cov ntsiab lus tseem ceeb:
Ua ntej vuam, tshem tawm xeb, roj, thiab noo noo los ntawm lub hauv paus hlau nto. Kev ua tsis tiav tuaj yeem ua rau porosity yooj yim.
Thaum siv 3.2 hli inch welding pas nrig rau nyias phaj splicing, qhov pom zoo vuam ceev yog 15-20 cm/min kom tsis txhob hlawv-los ntawm.
Rau vuam nyob rau hauv qis- qhov kub thiab txias (<0°C), preheat the base metal to 80-150°C, and ensure that the interpass temperature does not drop below the preheat temperature.
| Vuam pas nrig (mm) | Ntau yam tam sim no (A) | Lus hais |
|---|---|---|
| 2.5 | 60-90 (AC / DC) | Tsis txhob hlawv- los ntawm thaum welding nyias daim hlau. |
| 3.2 | 80-140 (AC / DC) | Kev qhia tshwj xeeb: 100-120A pom zoo. |
| 4.0 | 110-210 (DC) | Preheating yuav tsum tau thaum vuam tuab daim hlau. |
Ib puag ncig tshwj xeeb thiab ceev faj
Cov Lus Qhia Txog Kev Tsim Kho Lub Caij Ntuj No: Thaum qhov kub ntawm qhov nruab nrab qis dua 0 degree, preheat lub hauv paus hlau rau 80-100 degree. Qhov kub ntawm qhov sib cuam tshuam yuav tsum tsis txhob poob qis dua qhov kub ntawm qhov preheat los tiv thaiv kom txias sai ntawm vuam thiab txias tawg.
Txhua yam -Txoj hauj lwm Vuam Adaptability: Kab rov tav, kab rov tav, ntsug (saum toj), thiab nyiaj siv ua haujlwm vuam tau txais kev txhawb nqa. Txawm li cas los xij, rau txoj kab ntsug thiab hla lub taub hau, nws raug nquahu kom siv cov electrodes nrog txoj kab uas hla tsawg dua lossis sib npaug li 4.0mm thiab txo qhov tam sim no los ntawm 10%. Thaum ntaus lub arc, siv rov qab - txoj kev mus rau pem hauv ntej kom tsis txhob ntaus lub arc sab nraum qhov zawj. Nws raug nquahu kom siv arc striker ua los ntawm cov khoom siv tib yam li lub hauv paus hlau.
FAQ
Q: Dab tsi yog cov ntawv thov tseem ceeb rau E7018 vuam pas nrig?
A: Lawv yog siv nyob rau hauv vuam structural steel, siab hlab ntsha, pipelines, thiab shipbuilding. Vim lawv lub zog weld siab thiab dav siv tau, lawv tshwj xeeb yog tsim rau vuam cov khoom tseem ceeb nrog cov khoom siv kho tshuab nruj.
Q: Kuv yuav tsum siv E7018 vuam pas nrig li cas?
A: Ua ntej, ntxuav lub hauv paus hlau nto. Siv ncaj qha tam sim no zoo polarity (DCEP) thiab tuav lub arc luv luv thiab arc ceev tsis tu ncua. Lub vuam tam sim no yuav tsum tau hloov kho raws li tus pas nrig txoj kab uas hla (piv txwv li, 3.2 hli pas nrig feem ntau sib haum rau 90-140 A).
Q: Dab tsi ua rau arc instability thaum vuam?
A: Qhov no yuav yog vim qhov tsis raug tam sim no (siab dhau lossis qis dhau), yuav tsum tau rov ua dua ntawm cov vuam tam sim no. Xwb, tus pas nrig yuav ntub thiab yuav tsum tau qhuav raws li qhov xav tau (qhuav ntawm 150-200℃rau ib teev).
Q: Kuv tuaj yeem daws qhov porosity hauv qhov vuam?
Teb: Qhov chaw cia khoom ntawm vuam rods yuav tsum nruj me ntsis tswj (kub 5 - 40℃, txheeb ze av noo tsawg dua los yog sib npaug li 60%), thiab damp vuam rods yuav tsum tau qhuav raws li kev cai; tswj kev ua haujlwm luv luv ntawm lub sijhawm vuam kom tsis txhob muaj cua nkag mus rau hauv lub pas dej molten.
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