Longitudinal welding machine production process is simple, high production efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than the straight seam welded pipe, the pipe can be used to produce larger diameter welded pipe with a narrower blank, but also the same width of the billet pipe production of different diameters. However, compared with the same length of straight pipe, weld length increased by 30 ~ 100%, and the production rate is low.

Therefore, the smaller diameter of most of the use of straight seam welded pipe, large diameter welded pipe are mostly used spiral welded.

1. Low pressure fluid delivery welded steel pipe (GB / T3092-1993) also known as the general welded pipe, commonly known as black tube. Is used to transport water, gas, air, oil and heating steam and other general lower pressure fluid and other uses of welded steel pipe. Pipe wall thickness is divided into ordinary steel and thick steel pipe; take over the form is divided into non-threaded pipe (light pipe) and with a rebar. Steel pipe specifications with the nominal diameter (mm) said the nominal diameter is an approximate diameter. Commonly used in customary, said low pressure fluid delivery welded steel pipe used in addition to direct delivery of fluid, but also a large number of low-pressure fluid transmission pipe used for galvanized welded pipe.

2. Low pressure fluid delivery galvanized welded steel pipe (GB / T3091-1993), also known as galvanized welded steel pipe, commonly known as white pipe. Is used to transport water, gas, air oil and heating steam, warm water and other generally lower pressure fluid or other uses of hot-dip galvanized welding (welding or welding) pipe. Pipe wall thickness is divided into ordinary galvanized steel pipe and thick galvanized steel pipe; take over the form is divided into non-threaded galvanized steel pipe and threaded galvanized steel pipe. Steel pipe specifications with the nominal diameter (mm) said the nominal diameter is an approximate diameter. Commonly used in inches said, such as 11/2 and so on.

3. Ordinary carbon steel wire casing (GB3640-88) is the industrial and civil buildings, installation of machinery and equipment and other electrical installation projects for the protection of wire steel pipe.

4. Straight seam welded steel pipe (YB242-63) is a longitudinal weld pipe and steel pipe. Commonly divided into metric welded steel pipe, thin-walled tubes, transformers, cooling tubing and so on.

5. Pressure fluid delivery spiral submerged arc welded pipe (SY5036-83) is a hot-rolled steel strip for the tube blank, at room temperature spiral shape, with double-sided submerged arc welding method for the delivery of fluid under pressure Spiral seam steel pipe. Strong pressure steel, welding performance, after a variety of rigorous scientific inspection and testing, the use of safe and reliable. Large diameter steel pipe, conveying high efficiency, and can save the laying of pipeline investment. Mainly used for transporting oil and natural gas pipelines.

6. Pressure fluid delivery spiral welded high frequency welded steel pipe (SY5038-83) is a hot-rolled steel strip for the tube blank, at room temperature spiral molding, high frequency lap welding method for the delivery of pressurized fluid Spiral welded high frequency welded steel pipe. Strong pressure steel, plastic, and easy welding and machining molding; after a variety of rigorous and scientific testing and testing, the use of safe, reliable, steel pipe diameter, high transmission efficiency, and can save the laying of pipeline investment. Mainly used for laying pipeline transportation of oil, natural gas and so on.