Pre-welding: ua cov tsim longitudinally welded steel yeeb nkab sib koom ua ke thiab siv roj shielded vuam (MAG) rau nruam vuam;
Pre-welding: ua cov tsim longitudinally welded steel yeeb nkab sib koom ua ke thiab siv roj shielded vuam (MAG) rau nruam vuam;