The spiral welded pipe production line and straight seam welded pipe production line are standard and standardized units developed and improved by Doleco Heavy Industries based on absorbing the essence of foreign forming technology and combining with domestic practical conditions. They are the most competitive and technologically distinctive mature units of Doleco Heavy Industries.

Welded pipe is the abbreviation of welded steel pipe.   It is a steel pipe made of steel plates or strips that are welded after being curled and formed.   The length is usually 6 meters.   The production process of welded steel pipes is simple, the production efficiency is high, there are many varieties and specifications, and the equipment investment is low, but the general strength is lower than that of seamless steel pipes.

Types of Welded Steel Pipes:

Carbon steel welded pipes can be divided into three types: Longitudinal submerged arc welded steel pipes (LSAW), Spiral welded steel pipes (SSAW), and Electric resistance welded Steel Pipe (ERW, also called high-frequency straight seam welded steel pipes ) according to the forming method of the weld seam.

1) LSAW steel pipe (Longitudinal submerged arc welded steel pipe)

Longitudinal submerged arc steel pipe (LSAW pipe) is a steel pipe with a weld seam parallel to the longitudinal direction of the steel pipe.   It is made of hot-rolled or cold-rolled steel plates or steel strips that are curled and welded.   The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is rapid.   Straight seam steel pipes are widely used in water supply projects, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction.

2) SSAW steel pipe (Spiral welded steel pipe)

Spiral welded steel pipe (SSAW pipe) is made of strip steel coils as raw materials, rolled into tube blanks at a certain spiral angle, and then welded together.   It can use narrow strip steel to produce large diameters.   steel pipe.   Spiral steel pipes are mainly used in drainage and water supply projects, fluid liquid, and solid transportation pipelines.   It is widely used in urban construction and municipal engineering.

The strength of spiral welded pipes is generally higher than that of straight seam welded pipes.   Welded pipes with larger diameters can be produced from narrower billets, and welded pipes with different diameters can also be produced from billets of the same width.   However, compared with straight seam pipes of the same length, the weld length is increased by 30~100%, and the production speed is lower.

3) ERW steel pipe (Electric resistance welded steel pipe)

Electric resistance welded steel pipe (ERW pipe) uses the skin effect and proximity effect of high-frequency current to heat and melt the edge of the pipe blank after the hot rolled coil is formed by a forming machine, and presses it under the action of a squeeze roller Welding to achieve production.   ERW has the characteristics of high efficiency,low cost,material saving and easy automation,it is widely used in aviation, aerospace, energy, electronics, automotive, light industry and other industrial sectors, is an important link in the welding process.

The main uses and applications of welded steel pipes are as follows:

1.   Conveying pipelines

Welded steel pipes are widely used to transport oil, natural gas, gas, water and other fluids, especially in urban gas and water supply systems.

2.   Structural pipe

Welded steel pipes are used in engineering fields such as building structures, bridges, steel frames, and supports.   They have good bearing capacity and shock resistance.

3.   Electric power industry:

Welded pipes are also suitable for transportation pipelines in the electric power industry.   Among them, high voltage power transmission and gas transmission, low voltage power distribution and gas transmission, underground gas pipeline, heat pipeline, urban gas pipeline and other places are also commonly used welded pipe as a conveying pipeline materials.

4.   Oil and gas drilling

Welded steel pipes can be used in the manufacture of oil and gas drilling and oil production equipment, such as drill pipes, casings, etc.

The spiral welded pipe production line and straight seam welded pipe production line are standard and standardized units developed and improved by Doleco Heavy Industries based on absorbing the essence of foreign forming technology and combining with domestic practical conditions. They are the most competitive and technologically distinctive mature units of Doleco Heavy Industries.

Yvonne.chu

Dorco Marketing Department