1. Lub raj tooj liab yuav tsum muaj qee lub zog thiab phab ntsa tuab, tuaj yeem tiv taus qhov siab ntawm lub tub yees nruab nrab (xws li Freon), los tiv thaiv nws cov pa tawm.
2. Lub raj tooj liab yuav tsum muaj lub koom haum zoo metallurgical thiab zoo tag nrho cov khoom siv kho tshuab, tsis muaj qhov tsis xws luag ntawm metallurgical (xws li inclusions, porosity), thiab muaj qhov zoo ntawm cov nplej loj, nrog kev sib tw zoo ntawm lub zog thiab plasticity, yog li nyob rau hauv cov txheej txheem ntawm kev tsim khoom. ob lub cuab yeej los tiv thaiv kev khoov du, nthuav dav thiab flaring thiab lwm yam ntxiv.
3. Lub raj tooj liab yuav tsum muaj kev vuam zoo. Soldering kev ua tau zoo yog thawj zaug hais txog cov tshuaj muaj pes tsawg leeg ntawm lub raj tooj liab, tshwj xeeb tshaj yog tsim nyog phosphorus, thiab cov txheej txheem saum npoo, tshwj xeeb tshaj yog kev huv, thiab kev huv ntawm lub raj kuj yog ib qho tseem ceeb lav ntawm kev nyab xeeb ntawm cov cua txias.
4. Copper tube yuav tsum muaj kev ua haujlwm zoo ntawm cov cua sov. Nws tsis yog hais txog lub thermal conductivity ntawm cov hlau nws tus kheej, tab sis nrog cov duab ntawm lub raj nto thiab lub tshav kub hloov coefficient ntawm lub raj tooj liab thiab cua thresh muaj feem xyuam rau lub internal threaded tooj liab raj dua lub tshav kub hloov coefficient ntawm lub teeb raj { {1}} lub sij hawm siab dua, sib sau ua ke hu ua high-efficiency tshav kub hloov ntawm tooj liab raj.
Cov txheej txheem txheej txheem tooj liab raj (txheej txheem extrusion) yog extruded los ntawm nruam casting billet ingots rau hauv billets, thiab ces txias dov, kos rau hauv cov hlab. Thaum ntxov xyoo 1990s casting thiab dov txoj kev (piv txwv li, casting billets + peb-yob slanting + daim duab ntawm cov yeeb nkab txheej txheem) tau tshwm sim, casting thiab dov txoj kev ntawm cov hlau tubing tau lug siv, xyaum qhia tau hais tias lub casting thiab dov txoj kev ntawm zus tau tej cov khoom. tooj liab tubing kev ua tau zoo thiab kev ruaj ntseg thiab txo cov nqi tsim khoom, kev siv hluav taws xob tsawg, kev ua haujlwm siab, kom ua tau raws li qhov xav tau ntawm kev lag luam cua txias thiab tub yees. Cua txias thiab tub yees kev lag luam xav tau kev xav tau.
