1. Nleba anya nke ihe eji eme ihe n'ikpere aka: n'ozuzu, nyocha anya gba ọtọ bụ ụzọ bụ isi.Site na nlele anya, ọ nwere ike ịhụ ntụpọ ọdịdị nke ọkpọkọ ọkpọkọ ịgbado ọkụ, ma mgbe ụfọdụ, a na-eji iko 5-20 na-ebuli elu mee nyocha.Dị ka ọnụ ọnụ, porosity, weld...
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