Double Seam Joint In Sheet Metal

2 57 is one of the most widely used methods for joining light and medium gauge sheet metal.

Double seam joint in sheet metal.

The grooved seam joint fig. 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. The double seam is also called acme lock hammer lock and pipe lock in the sheet metal trade. The seam can be on the outside or on the inside.

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. 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. Grooved seam are a type of self locking joint used commonly in the fabrication of cylindrical and conical objects. 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.

Hemming is the process in which the edge is rolled flush to itself while a seam joins the edges of two materials. A variety of seams are used to connect pieces of sheet metal in construction auto body creation and fine art sculpture. The type of seam used depends largely on the application.