Welded steel pipes are produced from steel plates or strips, fabricated through various welding processes. The classification of welded steel pipes primarily hinges on the method used for welding, which can be categorized into three main types: furnace welded pipe,  electric welded pipe (resistance welded), automatic electric arc welded pipe.

Types of Welded Steel Pipes Based on Welding Style

Welded steel pipes are further segmented based on their welding style, leading to two distinct variations:

- Straight Seam Welded Pipe: Characterized by seams that run along the length of the pipe.

- Spiral Welded Pipe: Noted for its spiral seam, this design allows for larger diameters and specific structural applications.

Shapes of Welded Steel Pipes

Moreover, welded steel pipes can be categorized based on their end shapes. This classification results in:

- Round Welded Pipe: The most commonly used shape, ideal for a variety of applications.

- Special-Shaped Welded Pipe: Includes square, rectangular, and flat shapes, tailored for specific structural requirements. 

Varieties of Welded Steel Pipes 

The properties and materials of welded steel pipes differ based on their intended use. Here are some standardized varieties:

1. GB/T 3091-2008 (Welded Steel Pipe for Low-Pressure Fluid Transport): Primarily used for transporting water, gas, air, oil, and heating water or steam. The representative material is Q235A grade steel.

2. GB/T 14291-2006 (Welded Steel Pipe for Mining Fluid Transport): This variety is designed for uses such as mine compressed air, drainage, and gas discharge. It typically employs Q235A and Q235B grade steel.

3. GB/T 12770-2002 (Welded Stainless Steel Pipe for Machinery Structure): Utilized in mechanical, automotive, bicycle manufacturing, decorative furniture, and other structural applications. Representative materials include 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, and 0Cr18Ni11Nb.

4. GB/T 12771-1991 (Welded Stainless Steel Pipe for Fluid Transport): This type is intended for transporting low-pressure corrosive media, with materials such as 0Cr13, 0Cr19Ni9, and others listed in the specification.

5. Decorative Stainless Steel Pipe (GB/T 18705-2002): Employed mainly for aesthetic applications within buildings and infrastructure.

6. Welded Stainless Steel Pipe for Architectural Decoration (JG/T 3030-1995): This standard focuses on the architectural industry, emphasizing visual appeal and structural integrity.

7. Welded Steel Pipe for Heat Exchangers (YB4103-2000): Specifically engineered for use in heat exchange systems, this type ensures effective thermal transfer.

From low-pressure fluid transport to specialized applications in decorative architecture, the diversity of welded steel pipes signifies their importance in modern engineering solutions. When selecting a welded steel pipe, it is key to consider the specific requirements of your application, ensuring structural integrity and optimal performance.