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2023 Greenhouse Gas Emission Verification Report

24-05

Butt welding application range of large-diameter elbow manufacturers

Butt welding is divided into resistance butt welding and flash butt welding. Large diameter butt welding elbow is a type of resistance welding method that uses resistance heat to weld two workpieces along the entire end surface at the same time. Butt welding has high productivity and easy automation, so it is widely used.

20-12

Do you understand the various elbow grades?

The elbow is a commonly used connection pipe fitting in plumbing installation, used for the connection of the pipe bend, and used to change the direction of the pipe.

20-12

The quality standard and usage method of the size head

The corresponding standards of flanges and tube plates for the large and small electric power department standard GD0506~0507 pressure vessel: JB/T4700~4707-2000 implement the national standard (GB/T9112-2000), the Ministry of Machinery standard (JB/T81-1959, JB /T74-1994), Ministry of Petrochemical Standards (SH3406-1996), Ministry of Chemical Industry Standards (HG/T5010-1958, HG/T20592-2009) and so on. The material of the exported forged steel flange conforms to the American ASTM A105 standard.

20-12

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