Copper pas nrig yog cov yeeb nkab uas siv tau zoo heev, tam sim no nyob rau ntau qhov chaw cov yeeb nkab yuav xaiv cov yeeb nkab tooj dag, feem ntau vim tias cov yeeb nkab tooj liab yog cov yeeb nkab ruaj khov, thiab txhim khu kev qha heev.
Brass tube tuaj yeem siv tau ntev, cov tshuaj tiv thaiv kab mob tooj liab yog qhov siab, tuaj yeem siv rau hauv qhov chaw txias thiab kub thiab siab, thiab yuav tsis raug hlawv lossis corroded, tuaj yeem siv ntau qhov chaw rau ib puag ncig. ntev heev. Lub sijhawm ntawm lub raj tooj dag tuaj yeem ua tau zoo ib yam li lub neej ntawm lub tsev, thiab qee zaum nws yuav txuas ntxiv, xws li cov yeeb nkab tooj liab tau teeb tsa hauv tsev kho mob hauv Beijing hauv xyoo 1920s ntawm lub xyoo pua xeem, tom qab ntau tshaj 70 xyoo, nws tseem tuaj yeem siv tau ib txwm. Qhov no kuj qhia los ntawm qhov tseeb tias cov kav dej tooj dag tuaj yeem siv tau ntau dua 100 xyoo.
Tsis tas li ntawd, tooj liab yeeb nkab roj hlau yeeb nkab muaj cov yam ntxwv, tab sis kuj muaj cov yam ntxwv ntawm lwm cov kav dej. Zoo li cov kav hlau zoo tib yam, lub zog zoo heev, tab sis nws qhov toughness thiab ductility zoo dua li cov kav hlau zoo tib yam, thiab nws muaj peev xwm ua tau zoo bending txheej txheem, kev co kuj, kev cuam tshuam kuj zoo heev, thiab nws yog qhov zoo heev. Cov kav dej tooj dag tsis muaj qhov xav tau siab rau qhov kub thiab txias, tuaj yeem siv rau hauv qhov chaw txias thiab kub, thiab yuav tsis siv kev laus rau lub sijhawm ntev, uas tsis tuaj yeem ua tau nrog cov kav dej zoo tib yam.
