3. Lub taub hau ntsia hlau poob tawm: Tom qab riveting, lub taub hau mandrel tsis tuaj yeem qhwv thiab poob tawm ntawm lub cev rivet.
4. Lub cev tawg: Tom qab rub riveting, lub cev riveting muaj qhov tawg ntev lossis tawg tag.
https://www.yukerivet.com/news/the-nail-cap-came-off-what-is-the-reason/
Lub sijhawm tshaj tawm: Lub Xya Hli-28-2022