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  1. Resistance welding
  2. Metal arc welding
  3. Ultrasonic welding
  4. Explosive welding
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Option 2 : Metal arc welding

Plastic or Non fusion welding: In this welding, the pieces of metal to be joined are heated to a plastic state and then forced together by external pressure. This procedure is used in forge welding, resistance welding, thermit welding and gas welding.

Fusion or Non pressure welding: In the fusion welding, the material at the joint is heated to a molten state and allowed to solidify. This includes gas welding, arc welding etc.

Cold welding: In this welding, the joints are produced without the application of heat but by applying pressure which results in inter-surface molecular fusion of the parts to be joined. This process is mainly used for welding nonferrous sheet metal.
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