Jiansheng Qin (Senior Welder) Onye ndu otu ịgbado ọkụ A, njikwa ndị otu otu, ọ dị mma na ịgbado ọkụ carbon dioxide na ịgbado ọkụ argon, maara nka na eserese. Oge nzipu: Feb-16-2023