1. Kev sib koom ua ke (uas yog, txoj kev sib sau ua ke) tsis muaj qhov tsis ncaj ncees lawm los yog cov npoo tsis ncaj ncees yog tsawg dua li tus nqi teev. Feem ntau, cov npoo tsis raug yog tsawg dua 8% ntawm cov phaj tuab, thiab qhov siab tshaj plaws yog tsis ntau tshaj 1.5 hli.

2. Txhawm rau kom ntseeg tau tias cov weld muaj qhov tsim nyog nkag mus tob thiab tso nyiaj, nws yuav tsum tau ua kom ntseeg tau tias nws tsis tawg lossis hlawv tom qab vuam, thiab nws tseem yuav tsum tau tswj qhov siab ntawm qhov vuam kom qhov siab ntawm qhov vuam. sab nraud weld yuav tsis cuam tshuam.

3. Lub vuam hlaws yog txuas mus ntxiv thiab zoo li tus kom ntseeg tau tias kev vuam sab nraud tom qab ntawd.

4. Lub vuam seam tsis muaj qhov tsis xws luag xws li vuam sib txawv, qhov pores, tawg, slag suav nrog, kub hnyiab thiab rov qab vuam, thiab qhov nruab nrab ntawm qhov sib txawv ntawm vuam seam yuav tsum yog ≤1mm.

5. Tsis muaj arc kub hnyiab, me ntsis txaws, thiab tsis muaj kev cuam tshuam rau lub bevel thiab nto ntawm cov yeeb nkab kawg.

6. Lub vuam seam yog txuam nrog lub hauv paus hlau, thiab lub cev thiab tshuaj lom neeg ntawm cov vuam seam hlau ua tau raws li qhov yuav tsum tau ua.