pressure-tight weld 密封焊道 ; 弥缝焊道 ; [机] 气密焊
tight-strong weld 密实强固焊缝
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The pipes are used for carrying sewage, water, oil or gas. Therefore, the weld seams produced during the manufacture of the pipe must be absolutely leak tight.
用于传输城市污水，水，油或者天然气的管道在焊接时必须保证严格的密封以防止泄露。
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