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Welded steel pipe
Welded steel pipe, also known as a welded pipe, is a type of steel pipe manufactured by rolling steel plates or strips and then welding them together. This process makes it a cost-effective and efficient option for production, with a wide range of sizes and specifications. However, compared to seamless steel pipes, the overall strength of welded pipes tends to be lower. Since the 1930s, advancements in high-quality strip steel rolling and welding technologies have significantly improved the quality of the welds. As a result, the variety and application of welded steel pipes have expanded, making them a popular choice in many industries, often replacing non-ferrous metals.
Welded steel pipes are mainly categorized into two types based on the shape of their weld: straight seam welded pipes and spiral welded pipes. The production of straight seam welded pipes is relatively simple, which leads to higher efficiency and lower costs. These pipes are commonly used for smaller diameter applications due to their ease of manufacturing. On the other hand, spiral welded pipes offer greater structural strength but require longer weld seams and slower production speeds. Therefore, they are more frequently used for larger diameter pipes.
Welded steel pipes for low-pressure fluid transportation (GB/T 3091-2008), often referred to as general welded pipes or black pipes, are widely used in applications such as water, gas, air, oil, and heating systems. They come in different wall thicknesses—ordinary and thickened—and can have either threaded or non-threaded ends. These pipes are not only used directly for transporting fluids but also serve as the base material for galvanized welded pipes.
Galvanized welded steel pipes for low-pressure fluid transportation (GB/T 3091-2008), commonly known as white pipes, are hot-dip galvanized welded pipes used for similar purposes. They are available in various wall thicknesses and end forms, and their size is typically indicated by nominal diameter, which is an approximation of the inner diameter. These are often expressed in inches, such as 1/2", 3/4", 1", and so on.
Other types of welded steel pipes include ordinary carbon steel wire conduits used in electrical installations, metric electric welded steel pipes, and thin-walled electric welded pipes for general structures. Spiral submerged arc welded pipes are used for pressurized fluid transport, offering strong pressure resistance and excellent welding performance. Similarly, spiral high-frequency welded pipes are used in both pressurized and low-pressure fluid systems, providing high efficiency and durability.
Spiral welded pipes for piles are also widely used in civil engineering projects, such as foundations for bridges, wharfs, and buildings. They are produced using double-sided submerged arc welding or high-frequency welding techniques, ensuring structural integrity and long service life.
Overall, welded steel pipes are versatile and essential in many industrial and construction applications, offering a balance between cost, performance, and reliability.