1. The structural characteristics of welded pipe joints

Welded pipe joints are suitable for pipeline systems where oil is the medium, and are also selected for water and air pressure pipeline systems. The working pressure is less than or equal to 32Mpa. 2.

Welded pipe joint structure: Welded pipe joint consists of a joint body, a nut and a pipe. The joint body and the pipe are sealed with an O-ring seal. When the joint body is screwed into the body, the metric fine thread and taper pattern are used And it uses a combined sealing gasket. The pipe is welded to the pipe in the piping system.

Features of welded pipe joints: Welded pipe joints have the advantages of simple structure, easy manufacturing, and good sealing, but they have a large amount of welding during installation and high welding quality requirements.

2. Performance specifications of welded pipe joints:

1. Applicable medium: oil, water, gas and other non-corrosive or corrosive media;

2. Applicable temperature: t≤450℃ depending on the medium used and the gasket selected;

3. Manufacturing materials: 20#, 35#, 1Crl8Ni9Ti, 0Crl8Ni-12M02Ti, 316L;

4. Piping requirements: ￠6—￠50 ordinary precision seamless steel pipe.

3. Manufacturing standards for welded pipe joints

1. Metal pipe joints for fluid transmission and general purposes, O-ring flat sealing joints (JB/T 966-2005)

2. Cone sealed welded straight pipe joint (JB/T 6381.1-2007)

3. Cone sealed welded straight through 55° unsealed pipe threaded pipe joint (JB/T 6381.2-2007)

4. Cone-sealed welded straight-through 55°sealed pipe threaded pipe joint (JB/T 6381.3-2007)

5. Cone seal welded straight through 60° sealed pipe threaded pipe joint (JB/T 6381.4-2007)

6. Cone sealed welded 90° elbow joint (JB/T 6382.1-2007)

7. Cone-sealed welded 55°unsealed pipe thread 90°elbow joint (JB/T 6382.2-2007)

8. Cone seal welded 55° sealed pipe thread 90° elbow joint (JB/T 6382.3-2007)

9. Cone seal welded 60° sealed pipe thread 90° elbow joint (JB/T 6382.4-2007)

10. Cone seal welded straight pipe joint at both ends (JB/T 6383.1-2007)

11. Cone sealed welded right-angle pipe joint (JB/T 6383.2-2007)

12. Cone-sealed welded three-way pipe joint (JB/T 6383.3-2007)

13. Cone-sealed welded partition wall right-angle pipe joint (JB/T 6384.1-2007)

14. Cone-sealed welded partition wall through pipe joint (JB/T 6384.2-2007)

15. Cone seal welded pressure gauge pipe joint (JB/T 6385-2007)