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  1. 1. Thermit Welding
  2. 2. Solid State Welding
  3. 3. Forge Welding Other variants
  4. 4. Cold welding Roll welding Hot pressure welding •Aerospace industry •Plastic welding •Medical devices •Shipbuilding •Automotive industry
  5. 5. Explosive welding
  6. 6. Friction Welding
  7. 7. Friction Stir Welding
  8. 8. Advantages • The friction heating is generated locally, so there is no widespread softening of the assembly • The weld is formed across the entire cross-sectional area of the interface in a single shot process • The technique materials is capable of joining dissimilar • The process is completed in a few seconds with very high reproducibility - an essential requirement for a mass production industry.
  9. 9. Ultrasonic Welding Process Applications: electronic industries– eliminating the need of soldering aluminium sheet metal-metal panels, welding of tube to sheet