1. Polishing
Polish nrog lub tshuab polishing ua rau saum npoo ntawm cov pwm ci.
2. Argon arc vuam
Siv argon arc vuam los kho qhov saum npoo ntawm cov pwm thiab ua kom nws du.
3. Txheej
Siv txheej txheej tshuab rau saum npoo ntawm pwm kom nws du.
4. Inlay lub tes tsho
Yog tias muaj ntau qhov ntawm cov pwm uas hnav tawm, cov txheej txheem ntawm inlaying tuaj yeem siv los ua kom tag nrho cov npoo ntawm pwm du.
