ASTM A106 GR. B Carbon Steel Welded Pipes

What are the main applications of ASTM A106 GR. B carbon steel welded pipes?

ASTM A106 GR. B carbon steel welded pipes are mainly used in various industries with high-temperature and high-pressure conditions. These pipes are widely used in the oil and gas industry for transporting fluids and gases in refineries, pipelines, and drilling operations. They are also employed in power plants for conveying steam and hot water. These pipes are used in the chemical industry to handle corrosive substances and in the construction sector for structural purposes. Their robustness and ability to withstand extreme conditions make them suitable for applications in boilers, heat exchangers, and other industrial equipment where reliable and efficient transportation of fluids is crucial.

How does ASTM A106 GR. B carbon steel welded pipe differs from other types of carbon steel pipes.

ASTM A106 GR. B carbon steel welded pipes differ from other carbon steel pipes primarily in their manufacturing process and specific characteristics. Unlike seamless pipes produced through a continuous extrusion process, ASTM A106 GR. B welded pipes are fabricated by welding two or more pieces of carbon steel together. This welding process introduces a seam along the length of the pipe.

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The presence of the weld seam in ASTM A106 GR. B welded pipes distinguish them from seamless pipes, which have a smooth and uniform structure throughout. However, it is important to note that the welding process keeps the overall strength and integrity of the pipe intact.

In terms of specific characteristics, ASTM A106 GR. B welded pipes offer excellent resistance to high temperatures and pressures, making them suitable for applications in oil and gas, power generation, and chemical processing. They exhibit good dimensional accuracy, making them easy to fit and install. Their welded construction provides them with superior durability and reliability.

Compared to other types of carbon steel pipes, ASTM A106 GR. B welded pipes are often preferred for their cost-effectiveness, as the welding process allows for efficient production and lower manufacturing costs. However, it is important to consider the specific requirements of each application to determine the most suitable type of carbon steel pipe to use.

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Electric Resistance Welding (ERW) Process

Pipe is created using the Electric Resistance Welding (ERW) process by cold-forming a flat steel sheet into a cylindrical shape. The steel is then heated to a degree at which the edges of the steel cylinder are pressed together to establish a bond without the use of welding filler material.
Several Electric Resistance Welding (ERW) processes are available for pipe production. The two main types of ERW are:
. High Frequency Welding
. Rotary Contact Wheel Welding.

High Frequency Welding

In high frequency induction welding, a work coil is placed in front of the weld spot and acts as a conduit for the weld current to reach the material. Work coil does not come into contact with pipe. Through the magnetic fields that surround the pipe, an electrical current is induced into the pipe's substance. When changing pipe size, high frequency induction welding avoids contact marks and requires less setup time.

Rotary Contact Wheel Welding

The electrical current is passed through a contact wheel at the weld spot in rotary contact wheel welding. A portion of the forge pressure required for the welding process is also applied by the contact wheel. AC, DC, and square wave are the three primary types of rotary contact wheel welders. Electrical current is transferred in all three power supplies by brush assemblies that interact with slip rings attached to a revolving shaft that holds the contact wheels. The current is sent to the strip edges through these contact wheels.

Submerged Arc Welding (SAW) Process

A constantly fed bare wire electrode and the workpiece form an arc during the submerged arc welding (SAW) process. To produce protective gases, slag, and to add alloying components to the weld pool, the procedure requires a flux. Using a shielding gas is not necessary. Excess flux is recycled via a hopper as the arc advances along the joint line. After welding, any remaining layers of fused slag are simple to remove. The arc is generally invisible during welding because the flux layer totally covers it, and heat loss is also very minimal. In contrast to the manual metal arc's 25% thermal efficiency, this one can reach 60%.
There are two types of Submerged Arc Welding (SAW) processes:
. Longitudinal Submerged Arc Welding (LSAW) Process
. Spiral Submerged Arc Welding (SSAW) Process

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