Friction welding is a solid pressure welding method that uses the heat generated by the friction between the end faces of weldments to make the end faces reach the thermoplastic state, and then rapidly applies the upset force to achieve welding.
Friction welding has the following advantages:
(1) The welding quality is stable, the size accuracy of weldments is high, and the rejection rate of joints is lower than that of resistance butt welding and flash butt welding.
(2) High welding productivity, 5-6 times higher than flash butt welding.
(3) Suitable for welding dissimilar metals, such as carbon steel, low alloy steel, stainless steel, high-speed steel, copper stainless steel, copper aluminum, aluminum steel, steel zirconium, etc.
(4) Low processing cost, power saving, no need for special cleaning of weldments.
(5) It is easy to realize mechanization and automation, and the operation is simple. There is no spark, arc light and harmful gas in the welding workplace.
Disadvantages:
It is difficult to weld non-circular section by workpiece rotation. Disc shaped workpieces and thin-walled pipe fittings are difficult to be clamped and welded. Limited by the power of the spindle motor of the welding machine, the maximum cross section that can be welded by friction welding is 20000mm2 at present. Friction welding machine has large one-time investment cost and is suitable for mass production.
Applications: dissimilar metals and dissimilar steel products, such as copper aluminum transition joints in the power industry, high-speed steel structural steel tools for metal cutting, etc; Structural steel products, such as utility boiler coil, valves, tractor bearing shells, etc.