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русскийThe manufacturing processes for large diameter stainless steel welded pipes involve several steps to create seamless and reliable pipes suitable for various industrial applications. The choice of manufacturing process depends on factors such as the size, grade, and intended use of the pipes. Here are the main manufacturing processes for large diameter stainless steel welded pipes:
Submerged Arc Welding (SAW):
Process: In SAW, an electric arc is created between the base material (stainless steel plate) and a consumable flux. The arc melts the edges of the stainless steel plates, and the molten weld metal is shielded by the granular flux. This creates a clean and high-quality weld.
Advantages: SAW is known for its efficiency and ability to produce large diameter pipes with consistent weld quality. It's commonly used for pipes with thicker walls.
Electric Resistance Welding (ERW):
Process: ERW involves passing an electric current through the edges of the stainless steel sheets or strips, heating them to the point of fusion. Pressure is applied to form the welded joint. ERW can be done using high-frequency or low-frequency currents, with high-frequency ERW being more common for stainless steel.
Advantages: ERW is a cost-effective method suitable for pipes with diameters ranging from small to large. It produces welded pipes with good surface finish.
Gas Tungsten Arc Welding (GTAW or TIG):
Process: GTAW uses a non-consumable tungsten electrode to create an arc that melts the edges of the stainless steel sheets. A separate filler material, if required, is added to create the weld joint. GTAW is a precise welding method known for producing high-quality welds with minimal heat distortion.
Advantages: GTAW is used for welding stainless steel pipes that require exceptional weld quality, especially in applications where appearance and cleanliness are important.
Double Submerged Arc Welding (DSAW):
Process: DSAW is similar to SAW but involves two separate arcs and fluxes applied to both the inside and outside of the stainless steel pipe. This process is commonly used for larger diameter pipes and creates a double-sided weld.
Advantages: DSAW is suitable for manufacturing pipes with thicker walls and larger diameters while maintaining high weld quality.
Longitudinal Submerged Arc Welding (LSAW):
Process: LSAW is a variation of SAW where the welding is done along the length of the stainless steel pipe. It is commonly used for pipes with diameters ranging from 16 inches to 60 inches. LSAW is suitable for both small and large diameter pipes.
Advantages: LSAW produces pipes with excellent dimensional accuracy and is suitable for applications where straightness and alignment are critical.
Spiral Submerged Arc Welding (SSAW):
Process: SSAW involves helical welding of stainless steel strips to create a spiral-shaped pipe. It is commonly used for manufacturing large diameter pipes, especially for applications like oil and gas pipelines.
Advantages: SSAW pipes have a uniform wall thickness and are ideal for applications requiring resistance to internal and external pressure.
In conclusion, the choice of manufacturing process for large diameter stainless steel welded pipes depends on various factors, including the desired pipe size, wall thickness, and specific application requirements. Each of these processes has its own advantages and is selected based on the project's needs.
