About the air duct, what we must understand is: how to weld the air duct? How many welding methods are there? What are the reinforcement methods? In addition, the production of fabric ducts and components needs to meet certain requirements. What are the specific ones? 1. Operation of electric, gas welding, spot welding and seam welding Electric welding: suitable for air ducts and components with a plate thickness of more than 1.2mm, characterized by fast welding speed and small deformation, but the disadvantage is that it is easy to burn through when the plate is thin. During the operation, the surface of the weldment should be cleaned and a gap of 0.5-1mm should be left at the welding place. The weldment is aligned, and the full welding is performed after spot welding a few places. In order to prevent burn-through, the welding method of lap seam and lap corner seam can also be used. Gas welding: It is mostly used for the welding of thinner plates, but due to the large heating area and long heating time, the welding surface is easily deformed. Spot welding and seam welding: It is mainly used for splicing and closed seams of air ducts. The operation is mainly to weld the welded parts together through electric heating and contact pressure. These two welding methods have high efficiency, and the surface of the weldment is flat, not easy to deform, and the weld is tight and firm. Soldering: It is mainly used for air ducts, parts flanging and the bite is not tight. The shape and size of the electric soldering iron should be selected according to the requirements of the welding place. During the operation, the soldering iron is first plated with tin, and the surface is cleaned after heating, and then immersed in the zinc chloride solution, and then dipped in tin. It can be spot welded first and then continuously welded to ensure the quality of soldering. When welding, the temperature should be appropriate, and the welding seam should be dense to ensure the welding strength. 2. Reinforcement method of air duct Angle steel reinforcement: when the large side of the air duct exceeds the specification and the small side does not exceed the specification, use the flange specification angle steel to the right, and then reinforce it. This method is mostly suitable for concealed air ducts. Angle steel frame reinforcement: The angle steel frame is installed in the middle of the air duct and the elbow. Rib reinforcement: Use 1-1.5mm galvanized steel strips as ribs, and rive them intermittently on the inner wall of the air duct. This method is mostly suitable for surface-mounted air ducts. Rolling groove reinforcement: Rolling grooves are made on the pipe wall by pressure or other machinery, but because dust is easy to accumulate in the grooves, it is not used in ventilation and air conditioning purification systems. 3. Fabrication requirements for air ducts and components (1) The processing site should be covered with wood or rubber boards, and the iron filings, rust and debris on the board should be cleaned up. (2) When underlining, do not use a metal needle to scribe or punch on the surface, and use a template for nesting to avoid damaging the surface. (3) When cutting the fabric duct plate, the gap between the upper and lower blades should be adjusted well, which should generally be 0.04 times the thickness of the plate. (4) When the plate thickness of the fabric air duct is less than 1mm, it should be connected by a bite, and the width of the bite should be wider than that of the ordinary steel plate, generally 12-14mm, and the flange should be riveted with the fabric air duct rivet. However, when the thickness of the plate is greater than 1mm, welding should be used instead of gas welding. (5) Do not use ordinary steel tools when using manual bites, and remove iron filings, rust and sundries on the machine during machining. Note that the bite should be done once, not multiple times, because it is easy to cause the air duct to burst.
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