Hem और Seam क्या होता है ? Hem/ Seam in Sheet Metal Operations | Hemming Process | Seaming process

In sheet metal operations, a hem or seam is a type of edge finishing that involves bending and folding the edge of a piece of sheet metal over itself to create a smooth, rounded edge. The purpose of a hem or seam is to reinforce the edge of the sheet metal, to protect against sharp edges, and to provide a finished appearance.

There are several different types of hems and seams that can be used in sheet metal operations, including:

Single Hem: A single hem involves folding the edge of the sheet metal over once to create a single, smooth edge.

Double Hem: A double hem involves folding the edge of the sheet metal over twice, creating a more robust edge that is less likely to bend or warp.

Roll Hem: A roll hem involves rolling the edge of the sheet metal over itself multiple times to create a tight, rounded edge.

Lock Seam: A lock seam involves folding two edges of sheet metal together and interlocking them to create a strong, secure seam.

Standing Seam: A standing seam involves folding two edges of sheet metal together and then crimping them to create a raised seam that is visible on the surface of the sheet metal.
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