The process in which the edge of the sheet is folded over itself to increases the stiffness of the part, is called

  1. Dimpling
  2. Hemming
  3. Spinning
  4. Peen forming

Answer (Detailed Solution Below)

Option 2 : Hemming
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Detailed Solution

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The hem is an edge or border made by folding.

In the hemming process (also called flattening), the edge of the sheet is folded over itself. It increases the stiffness of the part. It eliminates the sharp edges and prevents damage/wear of the edge.

Seaming is the process of joining two edges of sheet metal by hemming.

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