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Welding Neck Flange (Code SO)

The full name is “Welding Neck Flat-Face Flange,” designated as SO. Its defining feature is its short-neck structure; after the pipe is inserted into the flange’s neck opening, it is connected by a flat weld (with the weld located on the outer side of the flange neck).
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Welding Neck Flange (Code WN)

The “welding-neck flange,” designated as WN, is one of the commonly used types of flanges. It is characterized by a short, tapered neck that is welded to the pipe using a butt-weld connection.
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