Vim tias muaj cov txheej txheem galvanized, cov kab nrib pleb, qhov hws, thiab cov slag inclusions yog nquag tshwm sim thaum lub sij hawm vuam, ua rau nws nyuaj kom tau zoo vuam zoo. Galvanized steel feem ntau coated nrog ib txheej ntawm zinc nyob rau sab nraud ntawm cov pa roj carbon tsawg, thiab zinc txheej feem ntau yog 20um tuab. Thaum lub sij hawm vuam, zinc melts rau hauv cov kua thiab ntab rau saum npoo ntawm lub pas dej molten los yog ntawm lub hauv paus ntawm lub vuam. Zinc muaj cov khoom loj solubility hauv hlau. Cov kua zinc yuav etch cov hlau sib sib zog nqus raws li cov ciam teb, thiab qhov qis melting point zinc yuav tsim "kua hlau embrittlement". Nyob rau tib lub sijhawm, zinc thiab hlau tuaj yeem tsim cov khoom sib txuas sib txuas. Cov theem nkig no txo cov plasticity ntawm cov hlau vuam thiab ua rau cov kab nrib pleb nyob rau hauv qhov kev txiav txim ntawm tensile kev nyuaj siab.
Vuam txheej txheem: Cov txheej txheem vuam muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm vuam. Cov txheej txheem vuam kom zoo tuaj yeem ua kom muaj qhov sib xws, ceev thiab lub zog ntawm vuam. Cov txheej txheem welding feem ntau suav nrog arc vuam, roj tiv thaiv vuam (xws li argon arc vuam), tsis kam vuam, thiab lwm yam.
Welding Materials: Kev xaiv cov khoom siv vuam kuj tseem ceeb heev rau kev ua haujlwm vuam. Cov khoom siv vuam siv feem ntau muaj xws li vuam hlau, vuam pas nrig, thiab lwm yam. Xaiv cov khoom siv vuam tsim nyog tuaj yeem txhim kho lub zog thiab corrosion tsis kam ntawm vuam.
Cov nyhuv ntawm galvanized txheej: Qhov saum npoo ntawm galvanized steel yeeb nkab yog them nrog ib txheej ntawm zinc, uas yuav cuam tshuam rau kev ua haujlwm ntawm vuam. Thaum lub sij hawm welding txheej txheem, zinc melts thiab sib tov nrog cov weld, tsim ib tug zinc alloy, uas yuav ua rau cov kev hloov nyob rau hauv cov tshuaj muaj pes tsawg leeg ntawm lub weld cheeb tsam. Tsis tas li ntawd, zinc alloy txheej tom qab vuam tuaj yeem cuam tshuam qhov corrosion kuj ntawm vuam.
Cov yam ntxwv ntawm cov welds: Cov yam ntxwv ntawm cov welds muaj xws li weld morphology, grain qauv, thiab lwm yam. Cov yam ntxwv ntawm cov welds muaj ib qho tseem ceeb rau lub zog, toughness, corrosion kuj thiab lwm yam khoom ntawm weld.
Thaum tshav kub kub cuam tshuam (HAZ): Thaum lub sij hawm vuam txheej txheem, lub tshav kub cuam tshuam cheeb tsam nyob ib ncig ntawm lub vuam kuj raug cuam tshuam. Cov khoom ntawm thaj chaw muaj kev kub ntxhov tuaj yeem hloov pauv, xws li kev loj hlob ntawm cov nplej, tawv tawv, thiab lwm yam. Cov kev hloov no tseem yuav cuam tshuam rau kev ua haujlwm ntawm tag nrho cov welded sib koom ua ke.
