1. Txias tawg (hydrogen -} indive nrib pleb)
Ua:
High Hydrogen cov ntsiab lus: noo noo hauv vuam Electrodes / Flux, lossis Roj / xeb ntawm lub hauv paus hlau saum npoo, decomposes rau hauv atomic hydrogen thaum vuam. Qhov kev siv hluav taws xob no rau hauv thaj chaw weld thiab sau rau ntawm cov ciaj ciam av.
Kev Nyuaj Siab Tshaj: S355J2W muaj qhov siab tshaj plaws cev (feem ntau 0.35-0.45%), ua rau kev ua siab weld weld tsis zoo. Sai sai txias tom qab vuam tsim tsim lub zog loj tensile nyob rau hauv kev sib koom tes.
Brittle Microstructure: Weld cua sov -}}} pa taws sai sai, ua ke nrog kev tawg ua ke nrog hydrogen thiab kev ntxhov siab.
Yam muaj: Cov kab nrib pleb txias feem ntau pom (piv txwv li, kev tawg sab hauv hauv lub haz) thiab tuaj yeem nthuav hauv kev thauj khoom, ua rau kev ua tsis tiav. Lawv kuj rhuav tshem kev txuas ntxiv ntawm kev tiv thaiv kab xeb, nrawm hauv cov hauv nroog corrosion.
2. Weld porosities
Ua:
Roj Entrapment: roj zoo li flux decomposition), h₂ (los ntawm noo noo) yog tsim tawm thaum lub sijhawm ua haujlwm zoo li weld hlau solidifies.
Kev tsis huv ntawm cov hlau / hlau: Roj, pleev xim, xeb, lossis cov roj oxide ntawm S355j2W lub ntsej muag sib tw nrog cov cua sov. Tsawg -} Zoo vuam xaim nrog lub siab impurity cov ntsiab lus tseem tuaj yeem tso roj tawm thaum lub sijhawm melting.
Cov txheej txheem tsis raug cai: dhau vuam ceev (tawm mus tsis muaj sijhawm khiav) lossis qis dhau ntawm cov dej ntws (tsis zoo ntawm molcen
Yam muaj: Porosities txo cov load zoo - bearing cheeb tsam ntawm weld, qis sib koom ua zog (los ntawm 10-30% rau cov mob hnyav). Lawv tseem ua raws li "Corrosion channels," pub ya raws / ntsev kom nkag rau hauv Weld, undermining cov hlau huab cua tsis kam.
3. Qhov tsis muaj fusion & tsis muaj kev nkag mus
Ua:
Cov tswv yim tsis txaus ua tshav kub: S355J2W muaj ntau dua thermal conductivity tshaj li cov pa roj carbon hlau. Yog tias vuam tam sim no / voltage yog tsawg dhau lawm, lossis kev ncig nrawm nrawm dhau, cov hlau hauv paus / weld hlau tsis ncav cuag lub ntsej muag zoo nkauj rau tag nrho Fusion.
Kev sib koom ua ke tsis zoo: Groove groove ces kaum, lossis cov ces kaum hauv paus tiv thaiv lub hauv paus ntawm kev sib koom ua ke, ua kom tsis tiav kev nkag mus.
Cov khoom tsis huv laj kab: Oxide txheej (los ntawm S355j2W lub pre- Cov xeb sib tshooj ntawm weld thiab cov hlau hauv paus.
Yam muaj: Ob qho kev tsis xws luag tsim tsis muaj zog "interfaces" hauv kev sib koom ua ke, ua rau nws pheej mus nrees tawg hauv kev ntxhov siab. Tsis muaj qhov nkag mus kuj tseem yoojyim rau hauv kev sib koom ua ke, uas tau siv dej noo thiab ua rau muaj kev sib koom ua ke ntawm s355j2w siv hauv sab nraum zoov / ntug dej hiav txwv.
4. Kev txiav txim siab me me (theem nrab feem ntau
Ua: Tsis tiav Slag kev tshem tawm ntawm ntau - Tsis tau muaj kev sib tw ua ke (swb rau hauv lub pas dej tsis tuaj yeem raug thawb hauv Molten.
Yam muaj: Slag tsis muaj zog ntawm weld cov kws kho tshuab thiab cuam tshuam kev tiv thaiv txheej xeb, ua rau pitting corrosion nyob ib ncig ntawm kev suav nrog.
