DSAW (akụkụ abụọ gbara okirikiri spiral submerged arc welded pipe) njirimara: usoro mmepụta nke ọkpọkọ welded dị mfe, arụmọrụ dị elu, ọnụ ala dị ala, mmepe ngwa ngwa. Ike nke spiral welded pipe bụ n'ozuzu elu karịa dsaw ọkpọkọ na ike warara billet mmepụta nke nnukwu dayameta ọkpọkọ, ị ...
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