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EFW (Electric Fusion Welding), ia a welding process that does not use a filler material. Also, EFW (Electric Fusion Welded) Pipe in terms of ferrous material specifications under ASME implies filler metal added (SA-691 and SA-671).

There are three processes for metallic pipe manufacture. Seamless (SMLS) Pipe is formed by drawing a solid billet over a piercing rod to create the hollow shell. Seamless Pipe provides the most reliable pressure retaining characteristics, and is often more easily available than welded pipe.

See http://www.fullsupply.co.uk/pipes.php for more info.

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ERW or Electric Resistance Welded Pipe is produced from individual sheets or continuously from rolls of skelp. ERW Pipe is cold formed into a cylindrical shape rather than hot formed. An electric current rather than a flame is used to heat the edges of the strip for the fusion weld.

ERW Pipe is subject to numerous finishing operations. ERW Pipe is primarily used as API Line Pipe for the transmission of gas and oil. It is also used for the transmission of water, under AWWA specifications, as piling and slurry pipe and in mechanical applications.