Vuam khoom ntawm ntau yamtooj liab alloys:
1. Lub thermal conductivity ntawm liab tooj liab yog siab.Lub thermal conductivity ntawm liab tooj liab nyob rau hauv chav tsev kub yog li ntawm 8 lub sij hawm loj dua li carbon hlau.Nws yog ib qho nyuaj rau lub zos sov lub tooj liab welding mus rau lub melting kub.Yog li ntawd, lub tshav kub qhov chaw uas muaj zog concentrated yuav tsum tau siv thaum lub sij hawm vuam.Kev tawg feem ntau tshwm sim thaum tooj liab thiab tooj liab alloys yog welded.Cov kab nrib pleb yog nyob rau hauv welds, fusion kab thiab tshav kub-tshem tawm tsam.Cov kab nrib pleb yog intergranular puas, thiab pom tseeb oxidation xim tuaj yeem pom los ntawm ntu ntu.Thaum lub sij hawm vuam crystallization txheej txheem, taug qab oxygen thiab tooj liab daim ntawv Cu2O, thiab tsim ib tug tsawg-melting eutectic (α + Cu2O) nrog α tooj liab, thiab nws melting point yog 1064 ° C.
2. Lead yog insoluble nyob rau hauv cov khoom tooj liab, thiab txhuas thiab tooj liab tsim ib tug tsawg-melting eutectic nrog ib tug melting point ntawm txog 326 ° C.Nyob rau hauv qhov kev txiav txim ntawm welding nyob rau hauv kev nyuaj siab, tooj liab thiab tooj liab alloy pob qij txha nyob rau hauv high kub daim ntawv tawg nyob rau hauv lub fragile qhov chaw ntawm lub welded pob qij txha.Tsis tas li ntawd, hydrogen nyob rau hauv lub vuam kuj tuaj yeem ua rau tawg.Porosity feem ntau tshwm sim nyob rau hauv welds ntawm tooj liab thiab tooj liab alloys.Porosity nyob rau hauv ntshiab tooj liab weld hlau yog tsuas yog tshwm sim los ntawm hydrogen gas.Thaum cov pa roj CO yog yaj hauv cov tooj liab ntshiab, qhov pores kuj yuav tshwm sim los ntawm dej vapor thiab CO2 roj tsim los ntawm cov tshuaj tiv thaiv ntawm carbon monoxide thiab oxygen.
3. Lub porosity tsim nyiam ntawm tooj liab alloy vuam yog loj dua li ntawm cov ntshiab tooj liab.Feem ntau, cov pores tau muab faib rau hauv nruab nrab ntawm lub vuam thiab ze ntawm txoj kab fusion.Thaum cov tooj liab ntshiab thiab tooj liab alloys tau welded, cov khoom siv ntawm cov khoom sib koom ua ke yuav txo qis.Nyob rau hauv lub vuam txheej txheem ntawm tooj liab alloys, tooj liab oxidation, thiab evaporation thiab hlawv ntawm alloy ntsiab yuav tshwm sim.Qhov qis melting point eutectic thiab ntau yam vuam tsis xws luag ua rau kom txo tau lub zog, plasticity, corrosion kuj thiab hluav taws xob conductivity ntawm lub welded ob leeg.
Post lub sij hawm: Jun-14-2022