Resistance welding and flash welding belongs to contact welding.

  Resistance welding belongs to pressure welding, it is to use directly through the contact area between the edge of the forming of tube billet current to generate heat, heating to the welding temperature and pressure of the welding solder.Resistance welding is divided into low frequency electric resistance welding (50 ~ 360 hz) and high frequency electric resistance welding (200 ~ 450 hz).Currently widely used high frequency electric resistance welding because it has high productivity and high dimensional accuracy and the advantages of high surface roughness.
   Flash welding is also called HuoHan, it USES weldment itself inherent resistance and contact resistance of weld interface, when passing a current, causing the metal heating machine.the method.Flashing when the spark of violent, contact surface to melt, then current interrupted, give big upsetting force, strip steel welding are under high temperature and high pressure are weld together.Due to strong mechanical and electrical equipment, large investment, and the length and thickness is restricted, therefore has not been widely used.

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