In sheet metal operation two edges are joined by ______.

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ALP CBT 2 Fitter Previous Paper: Held on 23 Jan 2019 Shift 3
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  1. grooving
  2. seaming
  3. heming
  4. bending

Answer (Detailed Solution Below)

Option 2 : seaming
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Explanation:

Seaming

  • In Sheet metal construction, mechanical seams are employed when joining light and medium gauge metal sheets.
  • There are following types of seams:
    • Groove       d seam
    • Pittsburgh seam
    • Dovetail seam
    • Plain dovetail seam
    • Flange dovetail seam
    • Beaded dovetail seam
    • Double seam
    • Butt seam
    • Lap seam
    • Slip joint seam

        

Hemming

  • The hem is an edge or border m ade 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 an d prevents damage/wear of the edge.

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