Galvanized steel feem ntau cuam tshuam nrog txheej txheej zinc, feem ntau 20 microns tuab, mus rau cov hlau tsis muaj carbon. Lub melting point ntawm zinc yog kwv yees li 419 degree, nrog rau qhov kub ntawm ib ncig ntawm 908 degree. Thaum lub sij hawm welding, zinc melts mus rau hauv lub xeev cov kua thiab ntab rau ntawm qhov chaw ntawm lub pas dej ua ke los yog ntawm lub hauv paus ntawm weld seam. Zinc muaj cov khoom solubility hauv cov hlau, thiab cov kua zinc tuaj yeem nkag mus thiab ua rau cov hlau txuas nrog cov ciam teb, ua rau "kua hlau embrittlement" tshwm sim los ntawm qhov qis melting point ntawm zinc.
Tsis tas li ntawd, zinc thiab hlau tuaj yeem tsim cov khoom sib txuas sib txuas, uas txo cov plasticity ntawm cov hlau vuam thiab tuaj yeem ua rau cov kab nrib pleb hauv kev ntxhov siab.
Thaum welding fillet welds, tshwj xeeb tshaj yog nyob rau hauv T-joints, nkag mus rau feem ntau yuav tshwm sim. Thaum lub sij hawm vuam ntawm galvanized hlau, zinc txheej ntawm qhov zawj ntawm qhov chaw thiab cov npoo, nyob rau hauv lub tshav kub ntawm lub arc, undergoes oxidation, melting, evaporation, thiab txawm volatilization, tso pa dawb thiab vapor, uas yuav yooj yim ua porosity nyob rau hauv lub weld seam. .
ZnO tsim los ntawm oxidation muaj lub siab melting point, tshaj 1800 degree. Yog tias qhov ntsuas qhov ntsuas tau qis dhau, nws tuaj yeem ua rau ZnO suav nrog. Tsis tas li ntawd, raws li Zn ua raws li deoxidizer, nws tuaj yeem tsim FeO-MnO lossis FeO-MnO-SiO2 qis-melting-point oxide inclusions. Tsis tas li ntawd, cov evaporation ntawm zinc ua rau ntau cov pa luam yeeb dawb thiab plua plav, uas ua rau khaus thiab ua phem rau tib neeg lub cev. Yog li ntawd, nws yog ib qho tseem ceeb kom zom thiab tshem tawm cov txheej galvanized los ntawm qhov chaw vuam.
