Welded Flange

The butt welding flange is not easy to deform, has good sealing, and is widely used. It has corresponding rigidity and elasticity requirements and a reasonable butt welding thinning transition. The distance between the welding port and the joint surface is large, and the joint surface is protected from welding temperature deformation. It adopts a relatively complex method. The trumpet-shaped structure is suitable for pipelines with large fluctuations in pressure or temperature or pipelines with high temperature, high pressure and low temperature. It is generally used for the connection of pipelines and valves with PN greater than 2.5MPa; it is also used for transporting expensive, flammable and explosive materials. on the media pipeline.

Carbon steel ASTM A105, ASTM A350 LF1/2, ASTM A181
Alloy steel ASTM A182 F5, F9, F11, F22, F91
Stainless steel ASTM A182 F304/L, F316/L
Outer Diameters: 1/2 inch to 24 inch, up to 2500#
Special made: 24'' to 60'', up to 900#
Wall Thickness: Schedule 40 to 160
Pressure Ratings: Class 150 to Class 2500
Face Type: RF, RTJ

 

Welded Flange Advantages

Socket weld flanges can be used in place of threaded flanges to minimize the risk of leakage.
No beveling is required before welding.
Welding work is on the outside of the pipe and does not penetrate the internal bore of the pipe
Recommended for applications where internal welding operations are particularly difficult. This socket weld construction eliminates internal pits while avoiding damage to the flange face caused by weld heat distortion and weld spatter. Has the same internal pressure as sliding on the flange and has a better fatigue life.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Steel Welded Flange Disadvantages:

Socket weld flanges require a high level of skill on the part of the welder, and the weld needs to be welded so that the expansion gap between the pipe and the shoulder is 1/16 inch.
The flare gap creates an opportunity for cracking defects, especially for corrosion-resistant pipes such as stainless steel pipes, where cracks between the pipe and the flange can cause corrosion problems. For this reason, SW flanges are not suitable for corrosive or radioactive environments, as solid buildup at the joint can cause operational and maintenance problems. That's why people use welding more often, as it passes completely through the pipe from the outside to the inside, which makes for a stronger and corrosion-resistant connection.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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