There are several methods for joining pipe together.
The three methods we will focus on are butt-welded (BW), screwed (Scrd), and socket-weld (SW).
Butt-Weld Connections
Butt-Weld Connections A butt-weld joint is made by welding the beveled ends of pipe together.
Screwed or Threaded Connections
Typically used on pipe 3 and smaller, threaded connections are generally referred to as screwed pipe. With tapered grooves cut into the ends of a run of pipe, screwed pipe and screwed fittings can easily be assembled without welding or other permanent means of attachment.
Socket-Weld Connections
The third method of joining carbon steel pipe is socket welding. When assembling pipe with socket-weld fittings, the pipe is inserted into the fitting before welding, unlike a butt-weld connection that has the pipe and fitting placed end-to-end.
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