Виды фальцевых соединений. №3 Полуторный лежачий фальц.

A video about how to make a one-and-a-half lying seam manually. The most common connection of thin sheet steel in the manufacture of air ducts and shaped parts of ventilation systems is a connection using folded seams. A folded seam is a connection of two sheets with bent edges pressed tightly against each other. According to their design, folded seams are divided into single, double, one-and-a-half (combined) and angular. In addition, they can be standing and lying. According to their location, they are divided into longitudinal, located along the air duct, and transverse, perpendicular to the axis of the air ducts or located at an angle to it. A single lying seam is the simplest connection used for a longitudinal closing seam in the air ducts of supply and exhaust general exchange ventilation systems. This seam can also be used in the manufacture of various parts of ventilation systems (air distributors, hoods, etc.). In air ducts or parts made of sheet steel with a thickness of more than 0.82 mm, connections are made only using single folds. Double standing folds are stronger and more airtight than single ones. They are often used for longitudinal seams in air ducts made of sheet steel with a thickness of up to 0.82 mm, which have increased requirements for seam density and strength. One and a half (combined) folds are used instead of double ones where it is difficult or impossible to make them at all. One and a half folds are almost as strong and airtight as double ones. Single and double standing folds are used in combination with lying folds for transverse connections of round and rectangular air duct sections, bends and other products when these products need to be given the greatest rigidity. Single corner, corner combined (American, Pittsburgh fold) folds are used in the manufacture of rectangular section products. For example, air ducts and rectangular section fittings. The width of the fold depends on the thickness of the sheet steel, as well as on the purpose of the seam. For longitudinal folds made of sheet steel 0.5 mm thick, the fold width used is 6 - 8 mm; from steel 0.7 - 0.8 mm thick - 8 - 10 mm; from steel 1 mm thick - 10 - 12 mm. Dear subscribers and guests of the channel, friends. Maybe someone would like to help the channel develop, here are the details for donations: Sberbank card: 4263433344748808 WebMoney: dollars Z498528204892 tenge K409267298200 bitcoin X553926644419 THANK YOU FOR YOUR UNDERSTANDING AND SUPPORT!