(9) Welding maka igwe anaghị agba nchara, carbon ígwè, galvanized mpempe akwụkwọ, aluminum, ọla kọpa…
(10) Kwesịrị ekwesị maka ịgbado ọkụ siri ike seams na ngwaọrụ dị iche iche: ịgbado ọkụ, ịgbado ọkụ Lap, Stitch ịgbado ọkụ, Ntu ịgbado ọkụ, Crimping ịgbado ọkụ, T-weld, tojupụtara Lap ịgbado ọkụ, Splicing onu ịgbado ọkụ