The specification or process method of stainless steel air duct shall guide the welding process of stainless steel air duct. Therefore, based on the previous construction experience, a set of stainless steel air duct manufacturing methods that meet the construction requirements, improve the construction quality, deal with the construction problems, and ensure the application are summarized. Under the premise of function, it can meet the requirements of appearance quality. At present, we have implemented this method in the project and achieved good results.
Features: good welding quality, small deformation, good appearance; The reinforcement form of the air duct is novel and the cost is reduced; The scope of application is applicable to the welding and construction of S-shaped spiral cyclone tube with a thickness of 1.0mm or more.
工艺原理：在镀锌板 风管产品标准的基础上，选用氩弧焊焊接1.0厚不锈钢钢板矩形 风管。氩弧焊不仅用以风管的横向连接，还用以风管的纵向拼凑，即风管接头均采用氩弧焊焊接。风管选用不锈钢角钢框架和斜角加固法，选用不锈钢板加固，以保障风管的刚度要求。
Process principle: on the basis of the product standard of galvanized sheet air duct, argon arc welding of 1.0 thick stainless steel rectangular air duct is selected. Argon arc welding is not only used for the horizontal connection of the air duct, but also for the longitudinal splicing of the air duct, that is, the air duct joints are welded by argon arc welding. Stainless steel angle steel frame and inclined angle reinforcement method are used for the air duct, and stainless steel plate is used for reinforcement to ensure the rigidity requirements of the air duct.
Stainless steel air duct assembly and reinforcement frame setting: set 2 stainless steel plate groups after cutting the materials, and set the fabricated reinforcement frame on the air duct group before welding. Longitudinal welding of air duct: fix the air duct clamp and weld the air duct longitudinally. The longitudinal weld of air duct is fillet weld. So, what are the manufacturing points of stainless steel air duct?
Side welding of air duct: the flanging height of air duct shall be kept at 15mm. If the flanging is too small, it is not only inconvenient for welding operation and fixture application, but also easy to transfer high temperature to the air duct during welding, resulting in air duct deformation. If the flanging is too large, the material will be consumed.
Welding reinforcement framework: move the set stainless steel angle steel frame to the transverse flanging joint of each throttle pipe, clamp it with clamps, and weld the frame between the transverse flanging joint of the air duct and the stainless steel bar. This can avoid deformation caused by direct welding of angle iron and air duct. Because the stainless steel angle steel reinforcement frame is only used for fixing, the welding between the stainless steel angle steel reinforcement frame and the air duct flange can be interrupted. Then carry out acid pickling and passivation treatment on the stainless steel air duct to improve the anti-corrosion characteristics of the air duct.
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