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Which two of the following joining processes are autogeneous?

  1. Diffusion welding
  2. Electroslag welding
  3. Tungsten inert gas welding
  4. Friction welding
  1. (i) and (iv)
  2. (ii) and (iii)
  3. (ii) and (iv)
  4. (i) and (iii)
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