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Common sense for welded steel pipes

Views:11     Author:Site Editor     Publish Time: 2019-06-03      Origin:Site

Welded steel pipe is also known as welded pipe, is made of steel plate or steel belt after crimping molding welded steel pipe. Welded steel pipe production process is simple, high production efficiency, variety of specifications, less equipment, but the general strength is lower than seamless steel pipe.


Since the 1930s, with the rapid development of continuous rolling production of high quality strip steel and the progress of welding and inspection technology, the quality of welding seam has been continuously improved. Welded steel pipe is divided into straight welded pipe and spiral welded pipe according to the form of welding seam.


Direct seam welded pipe production process is simple, high production efficiency, low cost, rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. It is possible to produce larger welded pipe with narrow blank, and different welded pipes with different diameters with the same width of blank. However, compared with the same length of straight seam pipe, the weld length increases by 30~100%, and the production speed is lower. Therefore, the smaller diameter welded pipe mostly adopts straight seam welding, while the larger diameter welded pipe mostly adopts spiral welding.


1 low pressure fluid transport with welded steel pipe also known as the general welded pipe, commonly known as the clarinet. Is used to transport water, gas, air, oil and heating steam, such as the general lower pressure fluid and other purposes of welded steel pipe. The wall thickness of steel pipe is divided into ordinary steel pipe and thickened steel pipe. The type of nozzle is divided into non-rebar tube (light tube) and rebar tube. The specification of steel pipe is expressed by the nominal diameter (mm), the nominal diameter is the approximate value of the inner diameter. Inches are traditionally used, such as 11/2, etc. Welding steel pipe for low pressure fluid transportation is not only directly used for fluid transportation, but also widely used as the original pipe of galvanized welded steel pipe for low pressure fluid transportation.


2 low pressure fluid transport galvanized welded steel pipe is also known as galvanized electric welded steel pipe, commonly known as white pipe. Is used for conveying water, gas, air oil and heating steam, warm water and other general lower pressure fluid or other purposes of hot dip galvanized welding (furnace welding or electric welding) steel pipe. The wall thickness of steel pipe can be divided into ordinary galvanized steel pipe and thickened galvanized steel pipe. The pipe end is divided into galvanized steel pipe without thread and galvanized steel pipe with thread. The specification of steel pipe is expressed by the nominal diameter (mm), the nominal diameter is the approximate value of the inner diameter. Inches are traditionally used, such as 11/2, etc.


Common carbon steel wire sleeve is used to protect the wire in industrial and civil construction, installation of machinery and equipment and other electrical installation projects.


4 straight seam electric welded steel pipe is a steel pipe with longitudinal parallel welding seam and steel pipe. Usually divided into metric electric welded steel pipe, electric welded thin wall pipe, transformer cooling tubing and so on.


5. Helical seam arc welded steel pipe for confined fluid transportation is a helical seam steel pipe with hot-rolled steel strip as the billet, which is usually formed by warm spiral, and welded by double-sided submerged arc welding method, which is used for confined fluid transportation. Steel tube has strong bearing capacity, good welding performance, after various strict scientific inspection and testing, safe and reliable use. Large diameter steel pipe, high transmission efficiency, and can save the investment of laying pipeline. Mainly used to transport oil and gas pipelines.


Helical seam high frequency welded steel pipe used for confined fluid transportation is a kind of helical seam high frequency welded steel pipe used for confined fluid transportation. Steel tube has strong bearing capacity and good plasticity, which is convenient for welding and processing. Through all kinds of strict and scientific inspection and testing, the use of safe and reliable, large diameter steel pipe, high transmission efficiency, and can save the investment of laying pipelines. It is mainly used for laying pipelines for transporting oil and natural gas.


7. The spiral seam submerged arc welding steel pipe for general low-pressure fluid transportation is a kind of hot-rolled steel strip rolled as a tube billet, which is often formed by warm spiral molding. It is a kind of submerged arc welding steel pipe for general low-pressure fluid transportation of water, gas, air and steam, etc. by means of double-side automatic submerged arc welding or single-side welding.


Helical seam high-frequency welded steel pipe for general low-pressure fluid transportation is a hot-rolled steel strip as a tube billet, which is often formed by spiral forming. It is welded by high-frequency lap welding method for general low-pressure fluid transportation with helical seam high-frequency welded steel pipe.


9 pile spiral weld steel pipe is a hot rolled steel strip as a tube billet, often warm spiral forming, using double submerged arc welding or high-frequency welding made of steel pipe, used for civil construction structure, wharf, bridge and other foundation piles.


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