A socket weld flange, abbreviated as SWF, is similar to a slip-on flange, except only one fillet weld is made to the flange and pipe. Pipe is welded to socket weld flanges by inserting the pipe into the socket and backing the piping out between 1/16” and 1/8”. This is to prevent the expanding pipe on the inner side of the weld from expanding when headed and cracking the weld on the fitting.

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Socket Weld Flange Sizes - 1/2" through 24"
	Raised Face ANSI Class 150, B16.5 (in) ANSI Class 300, B16.5 (in) ANSI Class 400, B16.5 (in) ANSI Class 600, B16.5 (in) ANSI Class 900, B16.5 (in) ANSI Class 1500, B16.5 (in) ANSI Class 2500, B16.5 (in)