Dab tsi welding electrodes pom zoo rau fastening, boiler kho los yog fabrication?
Kev xaiv cov khoom siv vuam zoo yog qhov tseem ceeb rau kev kho lub boiler ntev, kev tsim cov cuab yeej siv los txhawb kev ua haujlwm kub-dip galvanizing (cov khoom siv nyiaj siv ua haujlwm, racks, thiab pob tawb), thiab ua ntej galvanizing kom txo cov thickness ntawm txheej ntawm welds. . Molten zinc yog nruj heev rau cov hlau thiab cov khoom siv vuam, yog li xaiv cov khoom siv tsis raug tuaj yeem ua rau vuam yaig nyob rau hauv ib lub lis piam, ua rau kev kho ntau dhau thiab kim heev. Txhawm rau kom tsis txhob muaj kev tawm tsam sai lossis corrosion ntawm cov khoom siv vuam, nws yog ib qho tsim nyog yuav tsum siv cov vuam rods uas tsis tau siv sai sai los ntawm zinc, tab sis corrode ntawm tus nqi zoo ib yam li cov hlau hauv paus.
Nees nkaum tsib xyoos dhau los, AGA tau soj ntsuam qhov kev tiv thaiv corrosion ntawm ntau yam molten zinc brazing cov ntaub ntawv thiab tsim ib daim ntawv teev npe ntawm 6 cov ntaub ntawv pom zoo rau kev kho boiler thiab cov khoom siv lossis cov khoom tsim. Hmoov tsis zoo, qee yam ntawm cov khoom siv yav dhau los sim solder tsis tau tsim hnub no. Txhawm rau hloov kho cov npe uas twb muaj lawm, ib txheej tshiab ntawm vuam electrodes tau sim ntawm 2017 hauv kev sab laj nrog Lincoln Electric (Daim duab 1). Qhov kev nthuav dav tau nthuav dav dhau ntawm cov nplaum vuam (SMAW) thiab flux-cored arc vuam (FCAW) xov hlau, thiab tam sim no suav nrog cov khoom siv hluav taws xob submerged arc vuam (SAW) electrode rau smoother weld deposition sai. Cov ntaub ntawv no tau muab tso rau hauv lub molten zinc galvanizing kettle thiab qee qhov raug tshem tawm hauv lub sijhawm sim ntawm 1, 3 thiab 6 lub hlis. Cov npe tshiab ntawm cov khoom siv vuam pom zoo nyob rau hauv Table 1 suav nrog cov ntaub ntawv weld tshiab los ntawm cov kev tshawb fawb tshiab uas pom tias qhov hnyav zoo sib xws rau cov qauv tswj tsis tau zoo lossis cov hlau hauv qab. Feem ntau, nws tau pom tias cov ntaub ntawv solder nrog tsawg dua 0.25 feem pua silicon cov ntsiab lus yuav ua tau zoo nyob rau hauv kev sib cuag nrog molten zinc.
TAB 1: XOV TOOJ HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUV LUB TSEV KAWM NTAWV
| Vuam txheej txheem | Lincoln Electric Vuam Electrode | AWS Design | Silicon (qhov hnyav feem pua) |
|---|---|---|---|
| SMAW | Jetweld 2 Fleetwood 35 LS | ua 6027 E6011 | 0 22-0.26 feem pua 0 10-0.18 feem pua |
| SAW | L60-860 | F6A2-EL12 | 0.24 feem pua |
| FCAW | *NR-203 NiC plus NR 203 MP SIB 233 SIB 311 | E71T8-K2 E71T-8J E71T -8 E70T -7 | 0.06 feem pua 0 22-0.26 feem pua 0 19-0.20 feem pua 0 12-013 feem pua |
| * Vuam hlau poob ua ntej fabrication thaum kawm; nws raug pom zoo kom siv lub phaj ntsuas ua ntej siv. | |||
Table 1 kuj tseem siv tau los qhia cov khoom siv vuam uas tsim nyog siv thaum lub sij hawm tsim khoom thaum vuam ua ntej kub-dip galvanizing. Thaum cov khoom siv vuam welding tau xaiv ntau dua li cov hlau nyob ib puag ncig, qhov sib txawv tuaj yeem xav tau hauv cov vuam, uas feem ntau duller, rougher thiab thicker (Daim duab 2). Txawm li cas los xij, cov txiaj ntsig tshiab kawg ntawm kev kawm vuam pas nrig qhia tau hais tias cov ntsiab lus ntawm silicon (feem pua Si) ntawm cov khoom siv vuam tsis tas ua raws li cov qauv galvanizing reactivity qhia los ntawm Sandelin nkhaus. Txawm hais tias Sandelin nkhaus yog ib lub rooj muaj txiaj ntsig rau kev txiav txim siab cov reactivity ntawm cov hlau kom kub dip galvanized, nws yuav tsis yog ib qho txiaj ntsig metric thaum sim ua kom haum rau cov khoom siv vuam reactivity rau cov reactivity ntawm lub hauv paus hlau kom ua tiav cov thickness xav tau. thiab zoo li txheej txheej. Yog tias tsis paub meej, cov khoom siv vuam uas tau teev tseg hauv Table 1 tuaj yeem siv los txo qhov tuab ntawm txheej ntawm cov welds, uas ua rau muaj qhov sib txawv ntau dua.
