Electric resistance welding

Welding in the joining process

Welding is a permanent connection of structures or devices made of plastic or metal. The metal parts are brought to a plastic state, i.e. pasty, by heating. Then they are joined by appropriate force without the use of binders. A small volume is plasticized only at the interface between plastics or metals. There may be different sources of heat. The most popular is resistance electric welding, i.e. resistance welding.


Types of welding:

  • focal lengths
  • gas
  • water gas
  • oxygen-acetylene
  • electric resistance
  • frictional
  • butt spark plugs
  • spotlights
  • humpbacked
  • linear


Depending on the method, we first apply pressure, then warming up, or in the reverse order. You can also combine metals with ceramics.


Electric resistance welding

Electric resistance weldingThe process involves joining metals on the basis of their natural properties, i.e. electrical resistance. The heat is released by means of the current and the pressure of the electrodes. The metal is melted and the parts are joined. We do not need a third metal, i.e. a binder, to weld. The method of electric resistance welding is related to, inter alia, joining sections or sheets. The quality of the connection depends on the pressing force as well as the amount of heat. The most commonly used methods in electric welding are: point, projection, butt and line. Many materials can be joined by electric resistance welding. Welding is widely used in industry. The following materials are bonded: nickel, aluminum, titanium, copper, ferrous and non-ferrous metals.


Friction welding

Friction weldingFriction welding is also quite popular. In this method, the temperature is generated by surface friction. One element is fixed and the other is made to rotate. The phenomenon of particle diffusion as well as creep is important. Energy turns into heat. Adequate plasticity is created and the objects become immobile. Friction welding is a relatively new method, compared to other welding methods. This method is used in high-volume productions, such as aluminum rims, tools, car parts.

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