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Butt welding flange (WN type)
Butt welding flange (WN type)

Butt welding flange (WN type)

American standard butt-welding flange (WN type) is a kind of pipe fitting, which refers to the flange with neck...
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American standard butt welding flange (WN type) is a kind of pipe fitting, which refers to the flange with neck and circular pipe transition and connected with pipe butt welding. Butt welding flange is not easy to deformation, good sealing, widely used, there are corresponding rigid and elastic requirements and reasonable butt welding thin transition, welding from the welding surface distance, welding surface from welding temperature deformation.

Us standard butt welding flange (WN type) technical requirements

1. The level and technical requirements of butt welding flange shall meet the corresponding requirements of jb4726-4728.

1, the nominal pressure PN 0.25 MP 1.0 MPa carbon steel and austenitic stainless steel forgings allowed the use of level Ⅰ forgings.

2, in addition to the following provisions, nominal pressure of PN 1.6 MPa to 6.3 MPa forgings shall conform to Ⅱ level or above level Ⅱ forgings levels.

3, conform to one of the following situations, should accord with the requirement of Ⅲ and forgings: (1) the nominal pressure PN acuity 10.0 MPa flange forging; (2) chromium molybdenum steel forgings with nominal pressure PN>4.0MPa; (3) ferritic steel forgings with nominal pressure PN>1.6MPa and operating temperature ≤-20 ℃.

Welding flange is generally made by forging or forging rolling process. When using steel plates or sections, the following requirements shall be met:

1. American standard butt welding flange (WN type) shall undergo ultrasonic testing, without stratification defect; 2, should be cut along the rolling direction of steel into strips, through bending butt welding into a ring, and the surface of steel to form a ring of cylinder. The steel plate shall not be directly machined into butt welding flange with neck; 3. Full penetration weld shall be adopted for the butt weld of the ring; 4. The butt welding seam of the ring shall be subjected to post-welding heat treatment and shall be subject to 100% radiographic or ultrasonic inspection, and the radiographic inspection shall meet the grade II requirements of JB4730, and the ultrasonic inspection shall meet the grade I requirements of JB4730.

Iii. The lateral slope of neck of butt welding flange (WN type) shall not be greater than 7o. Welding flange in production and welding strict control of technical parameters, to ensure that the production and use of full play and value.