Double Seam Joint In Sheet Metal

The double seam is also called acme lock hammer lock and pipe lock in the sheet metal trade.

Double seam joint in sheet metal.

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. The seam can be on the outside or on the inside. 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. Hems are commonly used to reinforce an edge hide burrs and rough edges and improve appearance. 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. 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.

Up to 4 times the material thickness may also need to be added for thicker. The grooved seam joint fig. The type of seam used depends largely on the application.