Welded air ducts are metal ventilation duct systems connected through welding technology, which are widely used in industrial and construction fields. Their core materials include carbon steel, stainless steel, and galvanized steel sheets. With excellent sealing performance, durability, and structural strength, they have become the preferred solution for ventilation, dust removal, and exhaust gas treatment systems.

 

I. Core Characteristics of Welded Air Ducts 

1. High Sealing and Air - tightness 

The welding process enables seamless connections at pipe interfaces, eliminating the risk of gas or dust leakage. It is especially suitable for industries with strict sealing requirements, such as the chemical and pharmaceutical industries. 

 

2. Extra - long Service Life 

The combination of high - quality metal materials and welding technology ensures that the pipes can operate stably in high - temperature, high - humidity, or corrosive environments. The service life generally exceeds 10 years. 

 

3. Efficient Production and Cost Advantages 

The production process has a high degree of standardization, supports batch production of multiple specifications, and requires low equipment investment. It is suitable for quickly responding to the needs of different projects. 

 

4. Excellent Structural Strength 

The compressive capacity of welded air ducts is significantly higher than that of traditional seamed air ducts. They can meet the operating requirements of medium - and high - pressure systems and are suitable for large - scale industrial workshops and complex pipe networks. 

 

5. Wide Applicability 

From food processing workshops to high - temperature exhaust gas treatment systems, welded air ducts can meet the ventilation, dust removal, and gas transportation needs of different scenarios. 

 

II. Detailed Explanation of the Manufacturing Process of Welded Air Ducts 

1. Pre - welding Pretreatment 

Design a V - shaped groove according to the plate thickness. Use mechanical processing or plasma cutting to ensure the accuracy of the interface. Strictly control the current parameters to avoid inter - granular corrosion of the materials. 

 

2. Welding Technology Specifications 

- For manual arc welding, use DC reverse connection, and for argon arc welding, select a DC power supply. 

- Before welding, clean the surface of the welding wire with acetone to remove the oxide layer and conduct a drying treatment. 

 

3. Welding Process Control 

During the root pass welding, maintain a thin - layer weld to ensure the quality of root fusion. By adjusting the inter - layer temperature and cooling rate, prevent the deterioration of material properties caused by the precipitation of carbides. 

 

4. Post - welding Treatment Procedures 

After removing the weld slag, brush the weld with special tools to make it show metallic luster. Conduct pickling and passivation treatments, and finally rinse it thoroughly with hot water to ensure the corrosion resistance of the surface. 

 

III. Matching Material Selection with Application Scenarios 

1. Stainless Steel Welded Air Ducts 

- Characteristics: Resistant to acid - alkali corrosion, oxidation, and high temperatures (up to 500°C). 

- Applications: Food processing, pharmaceutical clean workshops, discharge of corrosive gases in chemical plants, and high - temperature flue systems.