Cov txiaj ntsig zoo ntawm deoxidation: Silicon yog lub zog deoxidizer. Nyob rau hauv cov txheej txheem vuam, nws tuaj yeem hnov mob nrog oxygen hauv lub pas dej molten los ua SiO₂ slag, uas ntab mus rau saum npoo ntawm cov hlau vuam thiab tshem tawm cov pa oxygen impurities. Qhov no txo qhov kev pheej hmoo ntawm porosity thiab oxide inclusions nyob rau hauv lub weld, txhim kho lub purity thiab compactness ntawm weld sib koom tes.
Stabilizing lub arc: Cov ntsiab lus tsis tshua muaj silicon tuaj yeem txhim kho cov kev coj ua ntawm lub pas dej molten thiab stabilize qhov vuam arc, ua rau cov txheej txheem vuam ruaj khov thiab txo cov txaws, uas yog qhov zoo rau kev tau txais lub qhov dej - tsim cov hlaws weld.
Nce kub cracking susceptibility: Ntau dhau ntawm silicon yuav txo qhov melting point ntawm grain ciam teb eutectic theem nyob rau hauv lub vuam hlau thiab ua rau kom cov kua theem feem ntawm lub grain ciam thaum lub solidification txheej txheem. Nyob rau hauv qhov kev txiav txim ntawm welding thermal stress, lub grain ciam teb yog nquag mus cracking, yog li no ho ua rau cov kub cracking nyiam ntawm lub weld sib koom tes.
Degradation ntawm weld toughness: Cov ntsiab lus silicon siab yuav txhawb cov nag lossis daus ntawm nkig theem (xws li silicides) hauv cov qauv vuam, tshwj xeeb tshaj yog nyob rau hauv tshav kub- cuam tshuam cheeb tsam (HAZ). Qhov no yuav txo tau qhov cuam tshuam toughness thiab ductility ntawm weld sib koom tes, ua rau nws yooj yim rau nkig tawg nyob rau hauv qis - kub los yog dynamic load tej yam kev mob.
Nce porosity txaus ntshai: Txawm hais tias silicon muaj cov nyhuv deoxidizing, ntau silicon yuav hnov mob nrog nitrogen hauv qhov chaw vuam los ua silicon nitride (Si₃N₄) roj. Yog tias cov roj tsis tuaj yeem khiav tawm ntawm lub pas dej molten nyob rau lub sijhawm, nws yuav tsim porosity hauv qhov vuam, cuam tshuam rau cov khoom siv kho tshuab thiab kev sib khi ua haujlwm ntawm kev sib koom ua ke.
Kev cuam tshuam rau weld fluidity: Ntau dhau ntawm silicon yuav ua rau kom cov viscosity ntawm cov pas dej molten hlau, txo qhov fluidity ntawm cov vuam, thiab yooj yim ua rau vuam tsis xws li kev nkag mus tsis tiav thiab tsis tiav fusion, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv sib koom ua ke los yog siab - cov txheej txheem vuam tam sim no.
Rau feem ntau npib tsib xee-raws li alloys siv nyob rau hauv vuam daim ntaub ntawv (xws li Inconel 625, Hastelloy C276), qhov zoo tshaj plaws silicon ntsiab lus feem ntau yog tswj nyob rau hauv0.1 ~ 0.5 hli. Cov kab no tuaj yeem sib npaug ntawm cov nyhuv deoxidation thiab vuam ruaj khov thaum txo qis qhov kev pheej hmoo ntawm kub tawg thiab toughness degradation.
