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Socket Weld Flanges (SW Flanges) achieve smooth, high-strength connections without threaded joints or full-penetration welding. Insert the pipe into the socket until it abuts the shoulder, back off 1/16 inch to allow for thermal expansion, then apply a single fillet weld on the outside. Their static strength matches that of socket-weld flanges, while fatigue life improves by approximately 50%, making them particularly suitable for pipelines experiencing frequent pressure or temperature fluctuations.