Kev txiav txim siab tseem ceeb vuam rau SPA-H Weathering Steel
Cov txheej txheem pom zoo: Shielded Hlau Arc Vuam (SMAW, stick welding), Gas Metal Arc Vuam (GMAW, MIG welding), thiab Flux-Cored Arc Vuam (FCAW) yog cov feem ntau siv rau SPA-H, raws li lawv muab kev tswj zoo ntawm lub pas dej ua ke thiab txo oxidation.
Zam rau cov ntawv thov tseem ceeb: Oxy- roj vuam tsis pom zoo, vim tias nws tuaj yeem ua rau cov qoob loo loj hlob ntau dhau hauv tshav kub- cuam tshuam rau cheeb tsam (HAZ) thiab txo cov corrosion kuj.
Cov hlau muab tub lim yuav tsum sib phim SPA-H's alloy muaj pes tsawg leeg (Cu, Cr, P) kom ntseeg tau tias qhov sib koom ua ke ntawm cov ntaub ntawv zoo tib yam tiv thaiv patina zoo li lub hauv paus hlau.
Pom zoo fillers: Rau SMAW, sivE7018-W(weathering steel electrode); rau GMAW/FCAW, siv ER70S-W (khoom hlau) los yog E71T-W (flux-cored hlau). Cov fillers no muaj cov tooj liab thiab chromium tsim nyog los txhawb kev tsim patina hauv thaj tsam weld.
Tsis txhob muab cov pa roj carbon steel tso: Siv cov qauv carbon steel electrodes (piv txwv li, E7018) yuav ua rau muaj kev sib koom ua ke uas tsis muaj huab cua tiv thaiv, ua rau kom nrawm, tsis sib xws ntawm cov vuam.
Preheat: SPA-H muaj cov pa roj carbon tsawg (tsawg dua lossis sib npaug li 0.12%), yog li kev ua kom sov tsuas yog xav tau rau cov ntu tuab (Ntau dua lossis sib npaug li 25 hli) lossis hauv qhov chaw txias txias (tsawg dua lossis sib npaug li 5 degree) txhawm rau tiv thaiv hydrogen -induced cracking. Lub preheat kub ntawm 100-150℃yog txaus.
Tom qab -welding kev kho mob: Tsis muaj kev ntxhov siab rau kev kho cua sov yog xav tau rau ntau daim ntawv thov. Rau cov welds tuab los yog cov pob qij txha tseem ceeb, lub teeb sib tsoo ntawm cov hlaws hlaws kom ua tiav zoo tuaj yeem pab txhawb kev sib koom ua ke patina thoob plaws hauv kev sib koom tes.
Tshem cov nplais zeb, xeb, roj, roj, thiab pleev xim los ntawm qhov chaw vuam (tsawg kawg 20 hli ntawm ob sab ntawm qhov sib koom ua ke) siv cov hlau txhuam, sandblasting, los yog sib tsoo. Cov kab mob tuaj yeem ua rau porosity hauv qhov vuam thiab cuam tshuam kev tsim patina tom qab.
Tsis txhob siv cov tshuaj chlorinated cov kuab tshuaj los ntxuav, vim cov tshuaj chlorine seem tuaj yeem ua rau xeb hauv thaj tsam weld.
Lub vuam sib koom ua ke thiab cua sov- thaj tsam cuam tshuam (HAZ) yuav tsim patina me ntsis qeeb dua li cov hlau hauv paus, tab sis nrog cov hlau muab tub lim kom raug, nws thiaj li yuav tsim ib qho xim liab doog - xim av tiav uas phim cov hlau seem.
Rau kev siv vaj tse nyob qhov twg yuav tsum tau ua kom zoo nkauj zoo nkauj tam sim ntawd, thaj tsam weld tuaj yeem maj mam sandblasted tom qab vuam kom nrawm tsim patina.
