Kev ceev faj rau tus pas nrig ntawm ib lub taub hau hluav taws xob cua sov raj:

1. Xaiv cov khoom tsim nyog raws li qhov ntsuas kub tiag tiag: yog tias qhov cub kub kub qis dua 1000 degree, nws raug nquahu kom siv cov nickel-chromium alloy txhuas rods; Yog hais tias lub cub tawg kub siab tshaj 1000 degree, nws raug nquahu kom siv cov hlau-chromium alloy txhuas rods.

2. Tsim nyog txoj kab uas hla thiab ntev:

1) Raws li seem ntawm cov hluav taws xob hluav taws xob hluav taws xob hluav taws xob los yog cov hluav taws xob tiv thaiv, xaiv qhov tsim nyog txoj kab uas hla ntawm cov hlau lead pas nrig: Feem ntau, txoj kab uas hla ntawm cov hlau lead pas nrig yog pom zoo kom siab tshaj 3 npaug ntawm txoj kab uas hla ntawm lub cub tawg. Feem ntau cov pas nrig diameters: φ8mm, φ10mm, φ12mm, φ14mm, φ16mm, φ18mm, φ20mm, thiab lwm yam.

2) Cov pas hlau lead tsis yog siv rau kev tsim hluav taws xob, thiab nws yog siv rau kev xaim. Yog li ntawd, qhov tsim nyog ntev yuav tsum raug xaiv raws li qhov xav tau tiag tiag los tiv thaiv cov cua sov hloov ntawm qhov ua rau cov hlau lead ua rau overheat.