DSAW(Double-sided spiral submerged arc welded pipe)litšobotsi: ts'ebetso ea tlhahiso ea phala e cheselitsoeng e bonolo, e sebetsa hantle haholo, e theko e tlase, nts'etsopele e potlakileng. Matla a phala e cheselitsoeng ka spiral hangata e phahame ho feta phala ea dsaw mme e ka fokotsa tlhahiso ea billet ea phala e kholo ea bophara, u...
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