Resistance welding

Resistance welding is a type of electrical welding in which the two metals pieces are joined with the help of heat produced due to the resistance offered at junctions joining the two metals. This heat makes the metal pieces melt at the junction and thereby joining together.

The amount of heat energy produced
at the junction is given as,

H = I2Rt
Where H is the heat energy produced at the junction.
          I is the current passing through the electrodes during welding process and,
          R is the contact resistance of the interface joining two metals.

Classification of Resistance welding

The resistance welding is classified into the following four types depending upon the type of electrodes used to weld and the welding obtained.
  1. Spot welding (Go to : spot welding for full text)
  2. Seam welding 
  3. Butt welding and
  4. Projection welding

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