Lub patina txheej ntawm weathering steel daim hlauyuav cuam tshuam rau vuam zooyog tias tsim nyog ua ntej- vuam tsis tiav. Lub patina yog txheej tuab oxide (tsuas yog tsim los ntawm cov hlau oxides, nrog rau cov hlau oxides ntawm Cu, Cr, Ni) uas tsim ntau yam kev sib tw thaum lub sij hawm vuam txheej txheem.
Porosity thiab tawg hauv Weld Seams
Cov oxide txheej ntawm cov hlau saum npoo muaj cov dej noo thiab cov pa tso rau hauv nws cov qauv. Thaum lub sij hawm vuam, kub kub ua rau cov oxides decompose thiab tso pa roj (xws li, oxygen, dej vapor), uas tau raug daig nyob rau hauv molten weld hlau thiab cov ntaub ntawv.
porosity(qhov me me nyob rau hauv weld seam). Qhov no ua rau lub vuam lub zog tsis muaj zog thiab corrosion kuj.
Hauv qhov xwm txheej hnyav, cov oxides tuaj yeem ua rau
txias tawglos yog
kub tawgnyob rau hauv cheeb tsam weld, raws li lawv cuam tshuam lub uniform crystallization ntawm molten hlau.
Txo Weld Adhesion
Cov txheej txheej patina ua raws li lub cev tsis sib haum xeeb ntawm cov vuam electrode thiab steel substrate, tiv thaiv cov hlau molten los ntawm kev ntub dej thiab kev sib txuas nrog cov khoom siv hauv paus. Qhov no ua rau
tsis tiav fusionntawm weld interface, uas yog ib qho tseem ceeb tsis xws luag uas yuav ua rau lub weld tsis nyob rau hauv kev ntxhov siab.
Kev kis kab mob ntawm Weld Hlau
Alloy ntsiab nyob rau hauv lub patina (xws li, Cu, Cr oxides) tuaj yeem sib tov rau hauv lub pas dej molten weld, hloov cov tshuaj muaj pes tsawg leeg ntawm cov hlau weld. Qhov no yuav txo tau qhov vuam qhov corrosion kuj (ib yam khoom tseem ceeb ntawm huab cua hlau) thiab ua rau thaj tsam weld muaj rusting dua li cov khoom siv hauv paus.
Txhawm rau kom ua tau zoo - vuam zoo, txheej patinayuav tsum tau muab tshem tawm ntawm qhov chaw vuamua ntej ua haujlwm. Ua raws li cov kauj ruam no:
Txhais qhov chaw ntxuav
Tshem tawm patina los ntawm a
20-50 mm dav cheeb tsamntawm ob sab ntawm lub vuam sib txuas (nrog rau qhov zawj saum npoo yog tias xav tau bevel). Qhov no ua kom cov electrode tuaj yeem hu ncaj qha rau cov hlau huv substrate.
Txoj kev ntxuav kom zoo
Kho tshuab ntxuav: Siv cov txhuam hniav, lub kaum sab xis nrog lub log sib tsoo, los yog cov xuab zeb blasting kom tshem tawm cov patina. Qhov no yog txoj hauv kev tshaj plaws - xyuas kom meej qhov chaw huv si qhia tau hais tias ci, ci hlau (tsis muaj oxide seem lossis xeb).
Tshuaj ntxuav: Rau qhov chaw me me los yog qhov tseeb vuam, siv cov xeb tshem tawm (piv txwv li, phosphoric acid-raws li kev daws teeb meem) kom yaj cov patina, tom qab ntawd yaug kom huv si nrog dej thiab qhuav kom tsis txhob re- xeb ua ntej vuam.Nco tseg: Tsis txhob siv cov kua qaub uas tawm hauv cov khoom seem, vim tias lawv tuaj yeem ua rau cov kab mob sib kis.
Ncej -Kev Tiv Thaiv Kev Tu
Ntxuav qhov chaw vuamtam sim ntawd ua ntej welding(hauv 4-8 teev) los tiv thaiv kev tsim ntawm lub teeb ci tshiab. Yog tias muaj kev ncua, npog thaj chaw huv nrog cov yeeb yaj kiab tiv thaiv lossis tiv thaiv - xeb roj (tshem cov roj ua ntej vuam).
Xaiv Matching Welding Materials: Siv cov vuam electrodes lossis cov xov hlau tshwj xeeb uas tsim los rau huab cua hlau (xws li, E7018-C1 rau kev tuav arc vuam, ER80S-G rau roj hlau arc vuam). Cov ntaub ntawv no muaj tib lub ntsiab lus alloy (Cu, Cr, Ni) raws li lub hauv paus hlau, kom ntseeg tau tias thaj chaw weld muaj qhov sib npaug ntawm corrosion.
Tswj Vuam Parameters: Siv cov hluav taws xob qis qis thiab luv luv arc ntev kom txo tau cov oxidation ntawm lub pas dej ua ke. Tsis txhob overheating cov khoom siv hauv paus, vim qhov no tuaj yeem ua rau cov txheej txheem patina puas tsuaj rau thaj chaw sab nraum thaj chaw tu.
Ncej -Kev kho Weld: Tom qab welding, grind lub weld seam kom du, ces siv apatina acceleratormus rau thaj tsam weld. Qhov no pab thaj tsam weld tsim ib txheej txheej patina uas phim cov hlau puag ncig, rov ua kom zoo nkauj tag nrho thiab tiv thaiv corrosion.
