1.What yog cov tub ntxhais tseem ceeb hauv galvanized steel vuam?
Zinc Txheej evaporation thiab Pore qhov tsis xws luag
Qhov cuam tshuam: Porosity txo weld lub zog thiab sealing, thiab nyob rau hauv cov neeg mob hnyav ua rau vuam tsis ua haujlwm.
Kev cuam tshuam ntawm zinc txheej ntawm arc ruaj khov
Kev cuam tshuam: Tsis tsim Weld tsim (xws li Weld hlaws, hauv qab), substandard saum toj zoo.
Deterioration ntawm tshav kub cuam tshuam cheeb tsam (haz) kev ua tau zoo
Qhov Cuam Tshuam: Yas thiab kev nruj ntawm lub Haz yog txo, thiab cov kab nrib pleb yog tus muaj feem cuam tshuam, tshwj xeeb tshaj yog nyob rau hauv high-constraint vuam.
Nce electrode / vuam phom puas poob
Kev cuam tshuam: Cov vuam Vuam Cov Nqi Siv thiab txo cov khoom siv ntau lawm.
2.Qhov dab tsi yog cov ua rau cov tub ntxhais tsis muaj teeb meem hauv galvanized steel vuam?
Zinc Txheej evaporation thiab Pore qhov tsis xws luag
Cause: Lub ntsiab lus melting ntawm zinc yog 419℃thiab lub boiling point yog 907 degree, uas yog qhov qis dua li lub ntsiab lus melting ntawm steel (li 1500 degree). Thaum lub sij hawm vuam, zinc txheej evaporates nrawm nrawm vim cua sov, ua tau ntau npaum li cas ntawm zinc vapor. Yog tias nws tsis khiav tawm hauv lub sijhawm, hydrogen pores lossis carbon monoxide pores yuav tsim hauv Weld.
Kev cuam tshuam ntawm zinc txheej ntawm arc ruaj khov
Cause: Zinc vapor muaj lub peev xwm tsawg (hais txog 9.39ev), uas yooj yim cov ntawv ntawm vuam, ua rau arc drift thiab ntau dua ntawm cov pas dej tswj.
Deterioration ntawm tshav kub cuam tshuam cheeb tsam (haz) kev ua tau zoo
Cause: Cov solubility ntawm zinc hauv hlau yog tsawg kawg nkaus. Lub siab vuam kub ua rau dinc rau diffuse rau hauv substtrate, sib sau ib tug loj loj (xws li Fe-Zn Alloy Txheej. Nyob rau tib lub sijhawm, lub substrate yog ib nrab decarburized thiab lub hardness txo.
Nce electrode / vuam rab phom hnav
Cause: thaum lub sij hawm tiv thaiv vuam (xws li chaw vuam), cov ntawv zinc tsawg-melting ntawm lub electrode thiab workpiece, ua rau elecesion thiab hlawv; Thaum lub sijhawm hlau arc vuam (Mig), Zinc Vapor corrodrodes lub vuam phom nozzle, tsis txaus nws lub neej pabcuam.
3.Txhua kev ua haujlwm weld?
Tom qab kev kho cua sov tom qab Weld: Kev nyuaj siab txhawb nqa (xws li cov choj sib tw (xws li cov choj kub) kom txo qis kev khiav tawm ntawm cov chaw nyob hauv Weld.
Kev tiv thaiv saum npoo: Tom qab vuam, zinc ntxiv rau hauv weld thiab cov chaw nyob ib puag ncig (xws li cov xim tawg zinc, zinc-nplua nuj xim) los kho cov xim tsis kam; Piv txwv li, tom qab vuam hlau daim phiaj, cov tshuaj tsuag txias nrog rau kev kuaj cov ntsev ntau dua lossis muaj kev sib npaug ntawm cov tshuaj ntsev muaj peev xwm mus txog ntau dua 500 teev.
4.What yog cov kev daws teeb meem rau cov xwm txheej tshwj xeeb?
Tuab phaj galvanized steel vuam: Siv ntau-txheej thiab ntau-hla vuam, thiab ntxuav zinc slag ua ntej txhua txheej ntawm vuam; Siv submerged arc vuam (pom), thiab flux pab cuam tshuam kev khiav dim ntawm zinc vapor.
Vuam ntawm Galvanized steel thiab stainless hlau (xws li eNNi-raws li Onni-1) kom cais zinc los ntawm cov hlau tsis sib xws; Thov ib qho txheej txheej insulating (xws li epoxy cob) tom qab vuam.
On-site high-altitude galvanized steel vuam: cored tus kheej-cored hlau-cored yuav tsum muaj, thiab kev npaj roj ntxiv, thiab ntawm chaw npaj ua haujlwm rau kev ua haujlwm; Cov neeg ua haujlwm hnav cov qhov ncauj qhov ntswg (nqus tau cov pa zinc tuaj yeem ua rau "fum hlau fumer").
5.Qhov li cas kom txo cov zinc txheej thaum pretreatment ua ntej vuam?
NEEG KHO TSHUAB SIB TSOO / SANDBLASTING: Tshem cov txheej zinc txheej tsis pub dhau 5-10 hli nyob ib ncig ntawm weld kom ua rau cov hlau substrate. Sandpaper (80-120 mesh) lossis sandblasting tuaj yeem siv.
Tshuaj lom neeg degrast / pickling: Siv Dilute Hydrochloric acid (5-10%
Laser / arc Pre-galvanizing txheej evaporation: Siv cov txheej qis li evinc txheej ua ntej thiab txo qhov kev tso tawm ntawm zinc vapor thaum vuam.