Double Seam Joint In Sheet Metal

Hems are commonly used to reinforce an edge hide burrs and rough edges and improve appearance.

Double seam joint in sheet metal.

Up to 4 times the material thickness may also need to be added for thicker. Some seams are created entirely by machine or in a metal shop while others are made to snap together without requiring welding or soldering on site. 2 57 is one of the most widely used methods for joining light and medium gauge sheet metal. A variety of seams are used to connect pieces of sheet metal in construction auto body creation and fine art sculpture.

The double seam is also called acme lock hammer lock and pipe lock in the sheet metal trade. The type of seam used depends largely on the application. It is normally used in the fabrication and joining of the round pipe or in joining or piecing together two sheets of metal to form a large wrap around section for square or rectangular ductwork. The extra material allowance for a grooved seam is 3 times the width w of the seam one half of this amount being added to each edge note.

Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Multiply 1 8 by 2 1 2 and your answer will be 5 16 inch which you will allow when laying out sheet metal for making the wire edge. The grooved seam joint fig.