What is EFW steel pipe?
EFW steel pipe (Electric Fusion Welding steel pipe) refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the work-piece so that the work-piece leaving the melt, the formation of the weld. EFW steel pipe is formed by rolling plate and welding the seam. The weld flash can be removed from the outside or inside surfaces using a scarfing blade. The weld zone can also be heat treated to make the seam less visible.
Welded pipe often has tighter dimensional tolerances than seamless, and can be cheaper if manufactured in the same quantities. It is mainly used for welding dissimilar steel welding sheet or which high power density, metal weldment can rapidly heated to high temperatures, which can melt any refractory metals and alloys. Deep penetration welding fast, heat-affected zone is extremely small, so small performance impact on the joints, the joint almost no distortion. But it has a requirement on a special welding room because welding using X-rays.
Pipes made from carbon steel lose strength at high temperatures. Electric resistance welded pipe is not considered satisfactory for service above 750 F, whereas furnace-butt welded pipes are not good above 650 F. For higher temperatures, pipe made from stainless steels or other alloys should be considered.
Pressure ratings for steel pipe at different temperatures are calculated according to the ANSI B31.3 Code for Pressure Piping. ANSI B31.3 gives stress temperature values for the various steels from which pipe is fabricated.
Seam welded pipes are made using plates while seamless pipes are made using dies. Steel pipes are commonly made with black finish or galvanized. Proper selection of steel pipe material is critical for strength and durability required for application and ductility and mach inability required to join it and form into piping. The selected pipe must withstand the conditions of use, especially pressure, temperature and corrosion conditions.
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