Friction Welding
To heat the welding can be used transformation of mechanical energy into heat through friction.
Friction welding is sometimes used for welding at the bottom of the tank for compressed gases. The length of seamless steel pipe with a pre-heated end of the skewer in the fast-rotating frame. By rotating the workpiece closer crimp face down the metal and imparts to it a hemispherical shape of the bottom of the cylinder. With the rapid rotation of the workpiece metal upsets quickly heated by friction between the crimping and the workpiece in the process of precipitation, the temperature does not decrease, but increases at the expense of mechanical friction. As a result, the friction of the bottom metal is strongly heated and facing down with the formation of bulges. To connect the circular cylindrical rods or tubes fixed in the details of the terminals of the machine and result in contact with the ends. One detail remains fixed, the other is rotated at a speed of 500 - 1500 obImin and kept pressed against the fixed part. Due to the ends of the friction parts are heated rapidly in a short time and brought to the melting, automatically turns off clutch, stopping the rotation of the spindle axis is then deposit details. In some cases the method has proved very effective. It features high performance (CPU time for different parts 1.5-50 sec), high quality and stability of the welding, because the process is automated, all parameters (speed, force of precipitation during welding) are characterized by great constancy. The method is very economical and has high efficiency of electric power consumption of 15-20 vt/mm2, and power consumption 7-40 times smaller than the contact electric welding, load three-phase network supplying the drive motor, it is quite uniform; cos f = 0.8.
The method makes it possible to weld dissimilar metals (aluminum, copper, aluminum, steel, copper and steel, etc.). The width of the zone of influence of the welded joint is not more than 2-3 mm. Especially effective welding blanks of cutting tools drills, taps, etc., of carbon and high-speed steel.
See also:
Blacksmith (Forge) Welding
Blacksmith (Forge) Welding Part 2
Induction (high frequency) Welding
Diffusion Welding
Casting or Foundry Welding
Friction Welding
Electrolytic Welding
Welding Under Water
Explosive Welding
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