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Weld pipe is a common pipe in the gas pipeline, the diameter of more than 426mm (or 508mm) of the pipe is generally referred to as large diameter welded pipe, according to the welding into the tube, can be divided into two kinds of spiral welded pipe and straight seam welded pipe.
Spiral welded pipe is made of low carbon carbon structural steel or low alloy structural steel strip according to a certain helix angle (also known as the forming angle) rolled into a tube, and then welded joints made, it can be narrow Production of large diameter steel pipe. Spiral welded pipe is mainly spiral submerged arc welded pipe (SSAW), widely used in China's various gas pipeline construction, the specifications with the outer diameter * wall thickness said. Spiral welded pipe with single-sided welding and double-sided welding, welded pipe should ensure that the water pressure test, weld tensile strength and cold bending performance to meet the requirements.
The straight seam welded pipe is formed by forming the hot rolled coil through the molding machine, so that the steel coil is deformed into a sleek cylindrical shape, which is welded with the skin effect of the high frequency current and the arc of the adjacent effect or the combustion under the flux layer, Edge heating and melting, and in a certain squeeze force under the fusion, the final cooling molding. (LSAW), which is known as high-frequency straight seam welded pipe (ERW), which is melted by arc welding using high-frequency current.
The main raw materials of Longitudinal Welded Pipe are low carbon steel hot rolled coil, hot strip, which is widely used in petroleum, metallurgy, construction, coal mine, port, machinery and so on. It is widely used in oil and gas transportation, low pressure water gas transportation, Conveyor roller, car drive shaft and so on.

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