The neckless flat welding flange is also a flat flange, and the boss without a flange is also a flat fillet weld. The difference between the flat welding flange with a neck and the flat welding flange without a neck is that the flat welding flange with a neck has one more pipe welding position than the flat welding flange without a neck. The flange welding method of the pipe neck flat welding flange is fillet welding, and the welding method of the neck butt welding flange and the pipe is ring welding. In addition, weld neck flanges (WN stands for “weld neck”) having a nominal diameter greater than 250 mm must be tested, eliminating the need to test SO flanges, and reducing costs.Ĥ Various forms of welding: flat welding cannot be inspected by X-ray photography, but butt welding can be inspected. From a manufacturing point of view, the slip-on flange (SO stands for SLIPON) has a larger inner diameter, so it is light in weight and low in cost. The neck flat welding flange and the neck flat welding flange are not easy to replace. Neck butt welding flanges and connecting pipes are B-type seams, neck flat welding flanges and connecting pipes are C-type seams, and the non-destructive testing after welding is different. 1 Different weld foams: a round pipe with neck flat welding flange and flange weld foam are fillet welds, while neck butt weld flanges and pipe seam weld foam are ring welds Ģ Different materials: The material of the neck flat welding flange is processed from ordinary steel plates of the required thickness, but the material of the neck butt weld flange is mainly processed from forged steel parts ģ The nominal pressure is different: the nominal pressure of the flat welding flange with the neck is 0.6-4.0MPa, and the nominal pressure of the butt flange is 1-25MPa.
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