What is the difference between ERW and EFW welding?

Electric Fusion Welding (EFW steel pipe) refers to electron beam welding, the use of the high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece leaves the melt, the formation of the weld.

It is mainly used for welding dissimilar steel welding sheets or which high power density, metal weldment that can rapidly heat 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 for a special welding room because welding uses X-rays.

Electric Resistance Welding  (ERW steel pipe): welding member combination is applying pressure through the electrodes, the use of current through the joint area of the contact surface, and the adjacent heat generating resistance welding process method, Also known as contact welding. It has excellent toughness and dynamic load strength, welding deformation.

Cangzhou Shenlong Pipe Manufacturing Co., Ltd. cooperates with Baosteel and Baogang to produce large-caliber seamless steel pipe, straight-seam welded pipe, spiral steel pipe, and pipe fittings. The products comply with API, ASTM, DIN, BS, and JIS standards, and can accept SGS, BV, and other inspections. The products are used in oil, natural gas, bridge, water conservancy, and other large-scale projects, which are worthy of trust.